An Tran | La Trobe University (original) (raw)

Papers by An Tran

Research paper thumbnail of Deployment costs of rural broadband technologies

Telecommunications Journal of Australia, 2009

One effect of the NBN plan will be to shift the 'digital divide' from the current unhappy contras... more One effect of the NBN plan will be to shift the 'digital divide' from the current unhappy contrast between dial-up access versus entry-level ADSL or ADSL+2 Internet access, to a new divide between 100 Mbit/s for the privileged 90% versus 12 Mbit/s for the more geographically isolated 10% of the population. The latter speed is so much better than most Australians have ever experienced, that few are yet concerned about the continuing disadvantageous asymmetry. Yet over the past 50 years, community expectations have shifted from having no TV whatever to B&W TV to colour (broadcast analogue signal) TV to digital TV, as a means of sharing mainstream community experiences (and not just those sporting events protected under 'no siphoning' legislation). By the time the NBN has been fully implemented, we can confidently expect that many online applications, including IPTV, will have grown in functionality to demand better than 12 Mbit/s user bandwidth-to the detriment of those on the wrong side of the digital divide. With this in mind, a very recent technology breakthrough permitting the range of FTTP to extend to 60 km offers a reduction in the expected 90:10 broadband imbalance to perhaps a 95:05 ratio or better. A paper by John Ellershaw et al in this issue demonstrates that if at least 20 Mbit/s user bandwidth is demanded for reasons of social equity, FTTP can be a cheaper solution-using aerial OF cable for the 'last 100 metres'-than terrestrial wireless access, out to that 60 km limit. SETTING THE WHOLESALE PRICING One of the first commercial problems for 'NBN Co' to solve will be setting the wholesale pricing. As the Federal Government is underwriting the whole investment, and is implementing the network as essential national infrastructure, there is no overriding need for the wholesale pricing to be set at a level that would give the government a direct commercial return on its investment-any more than for its investments in national roads and railway infrastructure. But it will be motivated to set the maximum price consistent with rapid take-up by its retail customers-Australia's more than 100 licensed carriers. John de Ridder's paper in this issue proposes a wholesale pricing strategy for the NBN that not only reconciles broadband investment incentives with affordability but also provides a partial solution to the net neutrality problem.

Research paper thumbnail of High-speed and long-reach WDM networks using low-bandwidth transmitter

Optics Communications, 2013

This paper describes a transmitter that can emulate a wide variety of frequency-dependent loss ch... more This paper describes a transmitter that can emulate a wide variety of frequency-dependent loss characteristics of high-speed dynamic random-access memory (DRAM) channels, with an aim to facilitate an automated test procedure for a DRAM interface, which does not require physical reconfiguration of channels. Specifically, the proposed transmitter can generate the waveform of an NRZ data stream that has experienced adjustable amounts of skin-effect loss and dielectric loss in electrical channels. To save the hardware cost of implementing a high-speed, high-resolution digital-to-analog converter, the transmitter constructs the waveform using a set of logarithmic and exponential basis functions, each of which is implemented using a pseudo-logarithmic amplifier and lowbandwidth amplifier with adjustable gain and bandwidth, respectively. The prototype chip, fabricated in a 65-nm CMOS process, occupies an area of 5200 µm 2 and operates over 1.4-7 Gbps while dissipating 38 mW at 7 Gbps. It is demonstrated that the implemented transmitter can emulate 10-40"-long microstrip lines on an FR4 grade material with a peak error less than 12.5% in the pulse response.

Research paper thumbnail of Performance Enhancement in RSOA-Based WDM Passive Optical Networks Using Level Coding

Journal of Lightwave Technology, 2013

Reflective semiconductor optical amplifier has been widely employed in wavelength-division-multip... more Reflective semiconductor optical amplifier has been widely employed in wavelength-division-multiplexed passive optical network (WDM-PON) for implementing colorless optical network unit. WDM-PONs using a single-feeder fiber is economically beneficial, but vulnerable to beat noise resulted from distributed and discrete reflections. In this paper, we present a novel technique exploiting simple digital signal processing to mitigate the impairments in single-feeder WDM-PON by means of introducing correlations between signal levels in a coding process. The correlation properties of the coded sequence permits overall spectrum shaping to suppress the low-frequency components. We apply dicode code, the simplest correlative level code that enables direct current balance, in the uplink of a WDM-PON with downstream continuous-wave seed light or in the downlink of a WDM-PON with remodulated upstream signal. In the first case, the system's reflection tolerance is substantially enhanced via the dicode-coded modulation in the uplink. Moreover, the system reach is extended by 15 and 25 km for data rate of 2.5 and 1.25 Gb/s, respectively. In the second case, a 60 km full-duplex WDM-PON with 10 Gb/s dicode-coded downlink and 2.5 Gb/s remodulated uplink is demonstrated with high robustness against the remodulation and reflection noise.

Research paper thumbnail of Training-Aided PDM 64-QAM Transmission with Enhanced Fiber Nonlinearity Tolerance

Optical Fiber Communication Conference, 2014

We show that fiber nonlinearity compensation of just the training sequence improves the nonlinear... more We show that fiber nonlinearity compensation of just the training sequence improves the nonlinearity-limited performance of training-aided m-QAM systems. Experimental results demonstrate transmission performance improvement by 0.4 dB for a 120-Gb/s 64-QAM 800-km system.

Research paper thumbnail of Amplifier Placement Methods for Metropolitan WDM Ring Networks

Journal of Lightwave Technology, 2004

This paper presents two new amplifier placement methods to minimize the number of amplifiers in m... more This paper presents two new amplifier placement methods to minimize the number of amplifiers in metropolitan wavelength-division-multiplexing (WDM) rings based on integer programming techniques. The first method describes the amplifier placement problem exactly and uses a nonlinear programming solver to obtain a solution. The second method approximates some requirements in the problem and employs a linear programming solver to derive the amplifier placement solution. A new amplifier placement method for self-healing WDM rings is also reported in this paper. The new method is based on iteratively solving an amplifier placement problem for a ring network under different link failure scenarios. The solution provides a minimum number of amplifiers required to operate the self-healing ring under a normal or any single-link or single-node failure conditions.

Research paper thumbnail of Two-stage frequency domain blind equalization for coherent pol-mux 16-QAM system with CD prediction and dual-mode adaptive algorithm

IEEE Photonics Conference 2012, 2012

ABSTRACT We report a two-stage frequency domain equalization method for non-data-aided coherent p... more ABSTRACT We report a two-stage frequency domain equalization method for non-data-aided coherent polarizationmultiplexed 16-QAM system. Robust performance against polarization-mode-dispersion and long-haul transmission is experimentally demonstrated using cascaded blind CD compensation and dual-mode adaptive equalization.

Research paper thumbnail of Data-Aided OSNR Estimation for QPSK and 16-QAM Coherent Optical System

IEEE Photonics Journal, 2013

We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized comp... more We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized complementary Golay sequences for both QPSK and 16-QAM coherent optical systems. The training sequences have complementary spectra, which enable accurate channel estimation and equalization, and have length-independent constellation for high-performance estimation. Estimation performances are verified through 100-and 40-Gb/s QPSK and 200-and 80-Gb/s 16-QAM coherent polarization-multiplexed optical systems, with an accuracy of 0.4 and 0.7 dB, in both simulations and experiments, respectively.

Research paper thumbnail of Frequency-Domain Blind Equalization for Long-Haul Coherent Pol-Mux 16-QAM System With CD Prediction and Dual-Mode Adaptive Algorithm

IEEE Photonics Journal, 2012

The combination of polarization-multiplexing (pol-mux) high-order quadratureamplitude-modulation ... more The combination of polarization-multiplexing (pol-mux) high-order quadratureamplitude-modulation (QAM) format and non-data-aided (NDA) channel equalization largely enhances the spectral efficiency of the coherent optical systems. In this paper, we present a two-stage frequency-domain equalization method for long-haul coherent polmux NDA system with 16-QAM modulation format. Chromatic dispersion (CD) is blindly estimated and compensated in the first stage of the equalizer, while multimodulusalgorithm-assisted decision-directed multimodulus algorithm (MMA-DDMA) is designed for the second stage to further enhance the equalization performance. The proposed algorithms are experimentally demonstrated in a 80-Gb/s coherent 16-QAM system over 800-km fiber transmission and 30-ps mean differential group delay to achieve wide-range precise CD estimation and better equalization performance compared with conventional adaptive algorithms.

Research paper thumbnail of Fiber-to-the-Home System with Remote Repeater

Advances in Lasers and Electro Optics, 2010

Advances in Lasers and Electro Optics 454 internetworking. These systems will be investigated and... more Advances in Lasers and Electro Optics 454 internetworking. These systems will be investigated and presented in this chapter together with an economic study of the repeater-based FTTH system compared with other technologies. 2. FTTH system with remote repeater A schematic of the proposed FTTH architecture with an upstream repeater is shown in Fig. 1 (Tran et al., 2006b). In this architecture, a conventional 1×N star coupler (SC) is replaced by a 2×N SC. One arm of the SC on the optical line terminal (OLT) side is connected to the remote repeater, which could be at the same location as the SC or at a different location for access to commercial power lines with a battery backup. The other arm of the SC is to transmit downstream signals through the SC and bypass the remote repeater. An isolator is installed on this downstream path to prevent upstream signals from entering. The downstream and upstream signals are separated/combined using a coarse wavelength division multiplexer (CWDM). The upstream signals can be 2R or 3R regenerated at the remote repeater using a burst-mode receiver (BMR), a burst-mode transmitter (BMT) and/or a clock-data recovery (CDR) module. The BMR and BMT can have the same specification as the OLT-receiver and ONU-transmitter, respectively. The CDR should be able to recover the clock and data at a rate of the PON system.

Research paper thumbnail of Dual-Stage Frequency Domain Blind Equalization for Long-Haul Coherent Polarization-Multiplexed QPSK and 16-QAM Systems

European Conference and Exhibition on Optical Communication, 2012

ABSTRACT We present a dual-stage equalization method for long-haul coherent polarization-multiple... more ABSTRACT We present a dual-stage equalization method for long-haul coherent polarization-multiplexed systems. Blind CD compensation and adaptive multi-modulus equalization are both implemented in frequency-domain to allow zero overhead transmission with least complexity. Experiment is conducted to show good performance for both QPSK and 16-QAM systems.

Research paper thumbnail of Long-reach passive optical networks for rural and remote areas

Digest of the 9th International Conference on Optical Internet (COIN 2010), 2010

... AV Tran1, KL Lee2, JC Ellershaw2, JL Riding2, K. Hinton2, BS Gopalakrishna Pillai1, Tim Smith... more ... AV Tran1, KL Lee2, JC Ellershaw2, JL Riding2, K. Hinton2, BS Gopalakrishna Pillai1, Tim Smith2,3, and RS Tucker2 ( 1Victoria Research Laboratory, NICTA Ltd ... Abstract We report long-reach PON systems utilizing distributed Raman amplification for rural and remote areas. ...

Research paper thumbnail of 10 Gb/s Long-Reach Optical Access with Multi-Mode Fiber Distribution Using Baseband Single-Sideband OFDM

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008

ABSTRACT

Research paper thumbnail of Enabling Passive Interfaces for Integrated Optical and Wireless Access Networks

Optical Fiber Communication Conference, 2010

ABSTRACT

Research paper thumbnail of Overhead-Free Channel Estimation using Implicit Training for Polarization-Multiplexed Coherent Optical Systems

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013

Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment an... more Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment and 224-Gb/s 16-QAM simulation. Overhead-free transmission can be achieved with less than 0.5 dB Q-penalty compared to traditional explicit training scheme.

Research paper thumbnail of Feed-forward control of SOA gain for power equalization in optical burst switching networks

Optics Communications, 2006

We evaluate the performance of a novel technique to equalize power variation between optical burs... more We evaluate the performance of a novel technique to equalize power variation between optical bursts using feed-forward control of semiconductor optical amplifier gain. The technique enables large dynamic range power equalization of incoming optical bursts with up to 10 dB power difference. Moreover, the technique can remove SOA-induced waveform distortion. We achieve more than 4 dB sensitivity improvement with equalized burst power.

Research paper thumbnail of Reconfigurable multichannel optical add-drop multiplexers incorporating eight-port optical circulators and fiber Bragg gratings

IEEE Photonics Technology Letters, 2001

Research paper thumbnail of 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Filter Detuning

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011

Page 1. 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Fi... more Page 1. 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Filter Detuning Qi Guo, An V. Tran and Chang-Joon Chae Victoria Research Laboratory, NICTA Ltd., Level 2, Building 193 ...

Research paper thumbnail of Deployment costs of rural broadband technologies

Telecommunications Journal of Australia, 2009

One effect of the NBN plan will be to shift the 'digital divide' from the current unhappy contras... more One effect of the NBN plan will be to shift the 'digital divide' from the current unhappy contrast between dial-up access versus entry-level ADSL or ADSL+2 Internet access, to a new divide between 100 Mbit/s for the privileged 90% versus 12 Mbit/s for the more geographically isolated 10% of the population. The latter speed is so much better than most Australians have ever experienced, that few are yet concerned about the continuing disadvantageous asymmetry. Yet over the past 50 years, community expectations have shifted from having no TV whatever to B&W TV to colour (broadcast analogue signal) TV to digital TV, as a means of sharing mainstream community experiences (and not just those sporting events protected under 'no siphoning' legislation). By the time the NBN has been fully implemented, we can confidently expect that many online applications, including IPTV, will have grown in functionality to demand better than 12 Mbit/s user bandwidth-to the detriment of those on the wrong side of the digital divide. With this in mind, a very recent technology breakthrough permitting the range of FTTP to extend to 60 km offers a reduction in the expected 90:10 broadband imbalance to perhaps a 95:05 ratio or better. A paper by John Ellershaw et al in this issue demonstrates that if at least 20 Mbit/s user bandwidth is demanded for reasons of social equity, FTTP can be a cheaper solution-using aerial OF cable for the 'last 100 metres'-than terrestrial wireless access, out to that 60 km limit. SETTING THE WHOLESALE PRICING One of the first commercial problems for 'NBN Co' to solve will be setting the wholesale pricing. As the Federal Government is underwriting the whole investment, and is implementing the network as essential national infrastructure, there is no overriding need for the wholesale pricing to be set at a level that would give the government a direct commercial return on its investment-any more than for its investments in national roads and railway infrastructure. But it will be motivated to set the maximum price consistent with rapid take-up by its retail customers-Australia's more than 100 licensed carriers. John de Ridder's paper in this issue proposes a wholesale pricing strategy for the NBN that not only reconciles broadband investment incentives with affordability but also provides a partial solution to the net neutrality problem.

Research paper thumbnail of High-speed and long-reach WDM networks using low-bandwidth transmitter

Optics Communications, 2013

This paper describes a transmitter that can emulate a wide variety of frequency-dependent loss ch... more This paper describes a transmitter that can emulate a wide variety of frequency-dependent loss characteristics of high-speed dynamic random-access memory (DRAM) channels, with an aim to facilitate an automated test procedure for a DRAM interface, which does not require physical reconfiguration of channels. Specifically, the proposed transmitter can generate the waveform of an NRZ data stream that has experienced adjustable amounts of skin-effect loss and dielectric loss in electrical channels. To save the hardware cost of implementing a high-speed, high-resolution digital-to-analog converter, the transmitter constructs the waveform using a set of logarithmic and exponential basis functions, each of which is implemented using a pseudo-logarithmic amplifier and lowbandwidth amplifier with adjustable gain and bandwidth, respectively. The prototype chip, fabricated in a 65-nm CMOS process, occupies an area of 5200 µm 2 and operates over 1.4-7 Gbps while dissipating 38 mW at 7 Gbps. It is demonstrated that the implemented transmitter can emulate 10-40"-long microstrip lines on an FR4 grade material with a peak error less than 12.5% in the pulse response.

Research paper thumbnail of Performance Enhancement in RSOA-Based WDM Passive Optical Networks Using Level Coding

Journal of Lightwave Technology, 2013

Reflective semiconductor optical amplifier has been widely employed in wavelength-division-multip... more Reflective semiconductor optical amplifier has been widely employed in wavelength-division-multiplexed passive optical network (WDM-PON) for implementing colorless optical network unit. WDM-PONs using a single-feeder fiber is economically beneficial, but vulnerable to beat noise resulted from distributed and discrete reflections. In this paper, we present a novel technique exploiting simple digital signal processing to mitigate the impairments in single-feeder WDM-PON by means of introducing correlations between signal levels in a coding process. The correlation properties of the coded sequence permits overall spectrum shaping to suppress the low-frequency components. We apply dicode code, the simplest correlative level code that enables direct current balance, in the uplink of a WDM-PON with downstream continuous-wave seed light or in the downlink of a WDM-PON with remodulated upstream signal. In the first case, the system's reflection tolerance is substantially enhanced via the dicode-coded modulation in the uplink. Moreover, the system reach is extended by 15 and 25 km for data rate of 2.5 and 1.25 Gb/s, respectively. In the second case, a 60 km full-duplex WDM-PON with 10 Gb/s dicode-coded downlink and 2.5 Gb/s remodulated uplink is demonstrated with high robustness against the remodulation and reflection noise.

Research paper thumbnail of Training-Aided PDM 64-QAM Transmission with Enhanced Fiber Nonlinearity Tolerance

Optical Fiber Communication Conference, 2014

We show that fiber nonlinearity compensation of just the training sequence improves the nonlinear... more We show that fiber nonlinearity compensation of just the training sequence improves the nonlinearity-limited performance of training-aided m-QAM systems. Experimental results demonstrate transmission performance improvement by 0.4 dB for a 120-Gb/s 64-QAM 800-km system.

Research paper thumbnail of Amplifier Placement Methods for Metropolitan WDM Ring Networks

Journal of Lightwave Technology, 2004

This paper presents two new amplifier placement methods to minimize the number of amplifiers in m... more This paper presents two new amplifier placement methods to minimize the number of amplifiers in metropolitan wavelength-division-multiplexing (WDM) rings based on integer programming techniques. The first method describes the amplifier placement problem exactly and uses a nonlinear programming solver to obtain a solution. The second method approximates some requirements in the problem and employs a linear programming solver to derive the amplifier placement solution. A new amplifier placement method for self-healing WDM rings is also reported in this paper. The new method is based on iteratively solving an amplifier placement problem for a ring network under different link failure scenarios. The solution provides a minimum number of amplifiers required to operate the self-healing ring under a normal or any single-link or single-node failure conditions.

Research paper thumbnail of Two-stage frequency domain blind equalization for coherent pol-mux 16-QAM system with CD prediction and dual-mode adaptive algorithm

IEEE Photonics Conference 2012, 2012

ABSTRACT We report a two-stage frequency domain equalization method for non-data-aided coherent p... more ABSTRACT We report a two-stage frequency domain equalization method for non-data-aided coherent polarizationmultiplexed 16-QAM system. Robust performance against polarization-mode-dispersion and long-haul transmission is experimentally demonstrated using cascaded blind CD compensation and dual-mode adaptive equalization.

Research paper thumbnail of Data-Aided OSNR Estimation for QPSK and 16-QAM Coherent Optical System

IEEE Photonics Journal, 2013

We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized comp... more We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized complementary Golay sequences for both QPSK and 16-QAM coherent optical systems. The training sequences have complementary spectra, which enable accurate channel estimation and equalization, and have length-independent constellation for high-performance estimation. Estimation performances are verified through 100-and 40-Gb/s QPSK and 200-and 80-Gb/s 16-QAM coherent polarization-multiplexed optical systems, with an accuracy of 0.4 and 0.7 dB, in both simulations and experiments, respectively.

Research paper thumbnail of Frequency-Domain Blind Equalization for Long-Haul Coherent Pol-Mux 16-QAM System With CD Prediction and Dual-Mode Adaptive Algorithm

IEEE Photonics Journal, 2012

The combination of polarization-multiplexing (pol-mux) high-order quadratureamplitude-modulation ... more The combination of polarization-multiplexing (pol-mux) high-order quadratureamplitude-modulation (QAM) format and non-data-aided (NDA) channel equalization largely enhances the spectral efficiency of the coherent optical systems. In this paper, we present a two-stage frequency-domain equalization method for long-haul coherent polmux NDA system with 16-QAM modulation format. Chromatic dispersion (CD) is blindly estimated and compensated in the first stage of the equalizer, while multimodulusalgorithm-assisted decision-directed multimodulus algorithm (MMA-DDMA) is designed for the second stage to further enhance the equalization performance. The proposed algorithms are experimentally demonstrated in a 80-Gb/s coherent 16-QAM system over 800-km fiber transmission and 30-ps mean differential group delay to achieve wide-range precise CD estimation and better equalization performance compared with conventional adaptive algorithms.

Research paper thumbnail of Fiber-to-the-Home System with Remote Repeater

Advances in Lasers and Electro Optics, 2010

Advances in Lasers and Electro Optics 454 internetworking. These systems will be investigated and... more Advances in Lasers and Electro Optics 454 internetworking. These systems will be investigated and presented in this chapter together with an economic study of the repeater-based FTTH system compared with other technologies. 2. FTTH system with remote repeater A schematic of the proposed FTTH architecture with an upstream repeater is shown in Fig. 1 (Tran et al., 2006b). In this architecture, a conventional 1×N star coupler (SC) is replaced by a 2×N SC. One arm of the SC on the optical line terminal (OLT) side is connected to the remote repeater, which could be at the same location as the SC or at a different location for access to commercial power lines with a battery backup. The other arm of the SC is to transmit downstream signals through the SC and bypass the remote repeater. An isolator is installed on this downstream path to prevent upstream signals from entering. The downstream and upstream signals are separated/combined using a coarse wavelength division multiplexer (CWDM). The upstream signals can be 2R or 3R regenerated at the remote repeater using a burst-mode receiver (BMR), a burst-mode transmitter (BMT) and/or a clock-data recovery (CDR) module. The BMR and BMT can have the same specification as the OLT-receiver and ONU-transmitter, respectively. The CDR should be able to recover the clock and data at a rate of the PON system.

Research paper thumbnail of Dual-Stage Frequency Domain Blind Equalization for Long-Haul Coherent Polarization-Multiplexed QPSK and 16-QAM Systems

European Conference and Exhibition on Optical Communication, 2012

ABSTRACT We present a dual-stage equalization method for long-haul coherent polarization-multiple... more ABSTRACT We present a dual-stage equalization method for long-haul coherent polarization-multiplexed systems. Blind CD compensation and adaptive multi-modulus equalization are both implemented in frequency-domain to allow zero overhead transmission with least complexity. Experiment is conducted to show good performance for both QPSK and 16-QAM systems.

Research paper thumbnail of Long-reach passive optical networks for rural and remote areas

Digest of the 9th International Conference on Optical Internet (COIN 2010), 2010

... AV Tran1, KL Lee2, JC Ellershaw2, JL Riding2, K. Hinton2, BS Gopalakrishna Pillai1, Tim Smith... more ... AV Tran1, KL Lee2, JC Ellershaw2, JL Riding2, K. Hinton2, BS Gopalakrishna Pillai1, Tim Smith2,3, and RS Tucker2 ( 1Victoria Research Laboratory, NICTA Ltd ... Abstract We report long-reach PON systems utilizing distributed Raman amplification for rural and remote areas. ...

Research paper thumbnail of 10 Gb/s Long-Reach Optical Access with Multi-Mode Fiber Distribution Using Baseband Single-Sideband OFDM

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008

ABSTRACT

Research paper thumbnail of Enabling Passive Interfaces for Integrated Optical and Wireless Access Networks

Optical Fiber Communication Conference, 2010

ABSTRACT

Research paper thumbnail of Overhead-Free Channel Estimation using Implicit Training for Polarization-Multiplexed Coherent Optical Systems

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013

Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment an... more Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment and 224-Gb/s 16-QAM simulation. Overhead-free transmission can be achieved with less than 0.5 dB Q-penalty compared to traditional explicit training scheme.

Research paper thumbnail of Feed-forward control of SOA gain for power equalization in optical burst switching networks

Optics Communications, 2006

We evaluate the performance of a novel technique to equalize power variation between optical burs... more We evaluate the performance of a novel technique to equalize power variation between optical bursts using feed-forward control of semiconductor optical amplifier gain. The technique enables large dynamic range power equalization of incoming optical bursts with up to 10 dB power difference. Moreover, the technique can remove SOA-induced waveform distortion. We achieve more than 4 dB sensitivity improvement with equalized burst power.

Research paper thumbnail of Reconfigurable multichannel optical add-drop multiplexers incorporating eight-port optical circulators and fiber Bragg gratings

IEEE Photonics Technology Letters, 2001

Research paper thumbnail of 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Filter Detuning

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011

Page 1. 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Fi... more Page 1. 20 Gb/s WDM-PON System with 1 GHz RSOA using Partial Response Equalization and Optical Filter Detuning Qi Guo, An V. Tran and Chang-Joon Chae Victoria Research Laboratory, NICTA Ltd., Level 2, Building 193 ...