A Problem Analysis of RSOA-Based Optical Access (original) (raw)
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Transmission impairments in long-reach WDM-PON using RSOA-based ONUs
2014 IEEE International Conference on Advanced Networks and Telecommuncations Systems (ANTS), 2014
The use of Reflective Optical Network Unit (ONU) in Passive Optical Networks (PON) is a very recent trend. This makes the ONU "colourless" and invokes an inherent physical layer security. A popular device of choice to implement the same is Reflective Semiconductor Optical Amplifier (RSOA). This paper presents a novel steady-state model of RSOA, along with a corresponding flow-diagram for numerical solution. It also studies the system performance through Bit-Error Rate (BER) analysis of the uplink of an RSOA based hybrid wavelength division multiplexing (WDM)-time division multiplexing (TDM) PON, with a Conventional Receiver as well as a Burst Mode Receiver (BMR). Furthermore, it investigates the feasibility of such a network under an optimum BER threshold for different network reach and number of supported users.
RSOA Based Optical Network Units for WDM-PON
Optical Fiber …, 2006
Abstract: Designs of low cost ONU for WDM-PON are presented and evaluated. Reflective-SOAs are proposed to be used as core of the ONU in a bidirectional single-fiber single-wavelength topology. FEC is employed to mitigate crosstalk effects. ©2005 Optical Society of America ...
Effects of Reflection in RSOA-Based WDM PON Utilizing Remodulation Technique
Journal of Lightwave Technology, 2009
We investigate the effects of the discrete reflection on the performances of upstream and downstream signals in the wavelength-division-multiplexed passive optical network (WDM PON) implemented in a single-fiber loopback configuration using the reflective semiconductor optical amplifiers (RSOAs). We first analyze the optical beat interference (OBI) noise caused by the discrete reflection, and clarify the relation between the reflection tolerance and the network's operating conditions such as the RSOA gain, the link loss, and the location of the reflection point, etc. The results show that the impact of the reflection can be expressed by using the effective crosstalk level. We then measured the reflection tolerance of the RSOA-based WDM PON, in which the downstream signal operating at 1.25 Gb/s is remodulated by the RSOA at the subscriber's site for the transmission of 155-Mb/s upstream signal. The reflection tolerances are measured to be in the range of 42 to 35 dB for the downstream signals and 29 to 19 dB for the upstream signals, depending on the RSOA gain. These small reflection tolerances are caused by the fact that the reflected light is re-amplified by the RSOA. We also show that the dependence of the reflection tolerance on the RSOA gain can be explained by using the effective crosstalk level. These results are used to evaluate the impacts of the unwanted discrete reflections on the RSOA-based WDM PON.
10-Gb/s Operation of RSOA for WDM PON
IEEE Photonics Technology Letters, 2008
We report on the 10-Gb/s operation of the reflective semiconductor optical amplifier (RSOA) for the next-generation wavelength-division-multiplexed passive optical network (WDM PON). The bandwidth of the RSOA used in this experiment is merely 2.2 GHz. Nevertheless, a clear eye opening is obtained at 10 Gb/s by using the electronic equalizer processed offline. We investigate the impacts of the network's operating conditions (such as the injection power to the RSOA and the fiber length) on the performances of these equalizers. The results show that the RSOA-based WDM PON is operable at 10 Gb/s and the maximum reach can be extended to >20 km with the help of the forward error correction codes.
Experimental demonstration of RSOA-based WDM PON with PPM-encoded downstream signals
Chinese Optics Letters, 2012
Pulse position modulation (PPM) is introduced downstream of the reflective semiconductor optical amplifier (RSOA)-based single-fiber full-duplex bidirectional wavelength division multiplex passive optical network (WDM PON) to suppress the interference brought by the remodulation effect in the RSOA, Rayleigh backscattering, and reflection of the connection devices. In addition, because of the powerefficient characteristic of the PPM-encoded signals, the power budget shows clear improvement. As the experimental tests indicate, with ∼6 dB extinction ratio (ER) in the downstream signal, the receiving sensitivity of the PPM-encoded channel is ∼2.6 and ∼3 dB higher than that of the NRZ (Non-return to zero)-encoded channel in the downlink and uplink, respectively.
Microwave and Optical Technology Letters, 2006
The effect of noise on the transmission performance of an RSOA-utilized bidirectional hybrid WDM/SCM-PON link is experimentally analyzed. The link used in experiment allows 33-km bidirectional transmission with 622-Mbps NRZ signal for downstream and 20-Mbps SCM signal at 1.5-GHz RF carrier for upstream. In the link, the RSOA is used as a remodulator in optical network unit (ONU), which plays an important role in the overall noise characteristic of the link. Experimental results show that by properly controlling the gain of the RSOA, the effect of backreflection and backscattering noise can be reduced. Experimental results also suggest that both the uplink and the downlink signals should be modulated to reduce the effect of noise.
Optik - International Journal for Light and Electron Optics, 2014
Here we have demonstrated a novel architecture of colorless wavelength division multiplexed-passive optical network (WDM-PON) and analyze its performance which is capable of transmitting 10 Gbps data symmetrically in both downstream and upstream. In this architecture downstream data is subcarrier modulated (SCM) using radio frequency (RF) as subcarrier and laser frequency as carrier with the help of a Mach-Zehnder modulator (MZM). For upstream data modulation an electro-absorption modulator, an optical coupler and reflective semiconductor optical amplifier (RSOA) are used. Upstream data is transmitted through wavelength conversion between pump wavelength and continuous wave light sent from central office (CO) using cross gain modulation (XGM) in RSOA. Pump wavelengths have separate wavelength band than the carrier's wavelength sent from optical network unit (ONU) and can be chosen any one in its band. Since carrier reuse scheme is implemented so all the ONUs are operates in colorless mode. Effect of ER of delay interferometer (DI) on output OCSR of DI for different input OCSR is performed for SCM data. Simulation is performed with all 16 downlink and 16 uplink channels having data rate of 10 Gbps having acceptable performance.
Optics Express, 2010
Detailed numerical investigations are undertaken of wavelength reused bidirectional transmission of adaptively modulated optical OFDM (AMOOFDM) signals over a single SMF in a colorless WDM-PON incorporating a semiconductor optical amplifier (SOA) intensity modulator and a reflective SOA (RSOA) intensity modulator in the optical line termination and optical network unit, respectively. A comprehensive theoretical model describing the performance of such network scenarios is, for the first time, developed, taking into account dynamic optical characteristics of SOA and RSOA intensity modulators as well as the effects of Rayleigh backscattering (RB) and residual downstream signal-induced crosstalk. The developed model is rigorously verified experimentally in RSOA-based real-time end-to-end OOFDM systems at 7.5Gb/s. It is shown that the RB noise and crosstalk effects are dominant factors limiting the maximum achievable downstream and upstream transmission performance. Under optimum SOA and RSOA operating conditions as well as practical downstream and upstream optical launch powers, 10Gb/s downstream and 6Gb/s upstream over 40km SMF transmissions of conventional double sideband AMOOFDM signals are feasible without utilizing in-line optical amplification and chromatic dispersion compensation. In particular, the aforementioned transmission performance can be improved to 23Gb/s downstream and 8Gb/s upstream over 40 km SMFs when single sideband subcarrier modulation is adopted in the downstream systems.
Wavelength reuse WDM-PON using RSOA and modulation averaging
Optics Communications, 2019
This work describes the first demonstration of a wavelength reuse wavelengthdivision multiplex passive optical network (WDM-PON) with employing passive modulation averaging for data erasure/modulation cancellation. We present a simple, low-cost, colorless bidirectional communication architecture that uses reflective semiconductor optical amplifiers (RSOA) and incoherent light communication. Successful error-free (BER<1e-9) simultaneous bidirectional communication has been demonstrated in links up to 30 km at 1.25 Gbps using 100-GHz channel spacing and bit-error rates (BER<1e-5) with 50-GHz channel spacing.