Cost-Effective OFDM WDM-PON system Delivering Downstream data 100Gbps and Upstream data 2 Gbps (original) (raw)
Related papers
Optics Letters
This paper presents Long Reach Orthogonal frequency division multiplexing Wavelength Division Multiplexing Passive Optical Network (OFDM WDM-PON) system capable of delivering downstream 100 Gbit/s data and upstream 2 Gbit/s data on a single wavelength. The optical source for downstream data and upstream data is Continuous wave Laser at central office and reflective semiconductor optical amplifier (RSOA) at each optical network unit
Springer Nature Singapore Pte Ltd. , 2018
In today's time due to the spread of smart phones, tablets, various machine-to-machine (M2M) communication-based applications and the rapid arrival of the internet of things (IoT)-based applications have raised request of huge bandwidth. Services for applications like transfer of various types of images, high-quality video streaming, and upcoming concepts of clouds in real time demand wireless broadband access. To cater such demands wireless access schemes using radio over fiber (RoF) technology can be used faithfully. RoF is becoming matured technology in terms of security, reliability, and coverage. Use of Raman amplifier can be done to mitigate limitations such electrical power attenuation, multipath fading, and chromatic dispersion for comparatively long distances in many applications. In this paper we have proposed the design of WDM-RoF-PON link operated at 80 Gbps data rate which comprises 8 multiplexed channels with 100-GHz channel spacing with PSK modulation technique. Due to their abundant bandwidth RoF networks are expert of supporting multiple RF subcarrier signals at a same time. Performance of proposed system is evaluated in terms of Q factor and BER parameters which provides better insight into quality of received signals in many applications. Keywords Radio over fiber (RoF) Á Phase-shift keying (PSK) Quadrature amplitude modulation (QAM) Á Passive optical network (PON) Central site (CS) Á Remote site (RS)
Performance Enhancement of 8 Channel WDM-RoF PON system at 80 Gbps data rate using Raman Amplifier
Innovations in Electronics and Communication Engineering Springer, Singapore, 2017
The proliferation of smart phones, tablets Machine-to-machine (M2M) communications and the rapid emergence of the internet of things (IoT) based applications have raised demand of huge bandwidth. Services for applications like Image transfer, video streaming, as well as innovative cloud in real time demand wireless broadband access. To cater to such demands wireless access schemes using Radio over Fibre (ROF) technology can be used faithfully. RoF is becoming a mature technology in terms of security, reliability and coverage. Use of Raman amplifier can be done to mitigate limitations such electrical power attenuation, multipath fading and chromatic dispersion for comparatively long distances. In this paper we have proposed the design of WDM RoF PON link operated at 80 Gbps data rate which comprises 8 multiplexed channels with 100GHz channel spacing with PSK modulation technique. Due to their abundant bandwidth ROF networks are capable of supporting multiple RF subcarriers simultaneously. Performance of proposed system is evaluated in terms of Q factor and BER parameters which provides better insight into quality of received signals.
High-speed coherent WDM PON for next-generation access network
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
The wavelength-division-multiplexed passive optical network (WDM PON) is very attractive for the future broadband access network due to its capability of providing practically unlimited bandwidth to each subscriber. However, for the massive commercial deployment, its competitiveness is yet to be improved. In particular, we need to increase its operating speed and maximum reach, and, at the same time, enhance its costeffectiveness. For these objectives, we have developed the high-speed WDM PON operating at per-wavelength speed of > 10 Gb/s by using reflective semiconductor optical amplifiers (RSOAs) and the digital coherent detection technique. We also evaluated the maximum operable speed of the RSOA-based WDM PON by using the classical Shannon theorem. This paper reviews these progresses achieved at KAIST.
1.6 Tbit/s OFDM WDM-PON system employing RSOA as a colorless transmitter
In this paper, we have evaluated a bidirectional Wavelength Division Multiplexing Passive Optical Network (WDM-PON) employing Intensity Modulated/Direct Detection Optical Orthogonal Frequency Division Multiplexing (IM/DD-OFDM). The proposed system employs 100 Gbps 16 Quadrature Amplitude Modulation (16-QAM) downstream and 5 Gbps On-Off keying (OOK) upstream wavelengths, respectively. The proposed system is considered low-cost as non-coherent IM/DD OFDM technology and a simple Reflective Semiconductor Optical Amplifier (RSOA) colorless transmitter are employed and no Dispersion Compensating Fiber (DCF) is needed. Based on the BER results of WDM signals, the proposed WDM-PON system can achieve up to 1.6 Tbit/s (100 Gbit/s/λ × 16 wavelengths) downstream transmission over a 30 km single mode fiber (SMF).
Transmission of 125-Gb/s PSK signal generated by using RSOA in 110-km coherent WDM PON
Optics Express, 2010
We generate the phase-modulated signal by utilizing the chirp characteristics of the directly-modulated reflective semiconductor optical amplifier (RSOA) for the cost-effective realization of a long-reach wavelength-division-multiplexed passive optical network (WDM PON). We first investigate the relation between the amplitude and phase modulation indices in a directly-modulated RSOA and optimize these modulation indices to maximize the symbol distance on the constellation diagram. The results show that, by operating the RSOA under this optimum condition, we can achieve the excellent receiver sensitivity of −49.8 dBm at 1.25 Gb/s. We implement a long-reach WDM PON by using the phase-modulated RSOAs and self-homodyne receivers, and demonstrate the error-free transmission of 1.25-Gb/s signal over a 110-km long link without using any optical amplifiers.
Optics Express, 2013
We demonstrate the 40-Gb/s upstream transmission in the 60-km reach wavelength-division-multiplexed passive optical network (WDM PON) implemented by using directly modulated reflective semiconductor optical amplifiers (RSOAs) and self-homodyne receivers. It is difficult to operate the RSOA at 40 Gb/s due to its limited modulation bandwidth. To overcome this problem and generate 40-Gb/s upstream signal, we utilize the quadrature phase-shift-keying (QPSK) format and the offset polarizationdivision-multiplexing (PDM) technique. For this purpose, we install two RSOAs at each ONU and provide the seed light for these RSOAs by polarization-multiplexing the outputs of two lasers with a small frequency offset (20 GHz). This frequency offset is used to separate the polarizationmultiplexed seed light by using a simple delay-line interferometer (DLI), instead of the polarization-beam splitter and polarization controller, at the ONU. The separated seed light is modulated by each RSOA at 20 Gb/s in the QPSK format, and then combined again by the DLI before sent back to the central office (CO). The results show that this WDM PON can support the transmission of 40-Gb/s channels spaced at 50 GHz over 60 km without using any remote optical amplifiers.
A Flexible and Reliable 40-Gb/s OFDM Downstream TWDM-PON Architecture
IEEE Photonics Journal, 2015
In this paper, a flexible and reliable 40-Gb/s time and wavelength division multiplexing passive optical network (TWDM-PON) architecture is proposed and demonstrated. Here, a 4 Â 10 Gb/s orthogonal frequency-division multiplexing (OFDM) downstream signal is achieved by utilizing four 2.5-GHz directly modulated lasers in the optical line terminal. A reflective optical semiconductor amplifier is utilized in each optical network unit to serve as upstream transmitter (Tx) transmitting 2.5-Gb/s on-off keying (OOK) and 10-Gb/s OFDM upstream traffic, respectively. In addition, the dynamic bandwidth (capacity) allocation and fiber fault protection also can be achieved by applying the new proposed PON architecture with software-defined networking approach.