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We propose a novel carrier phase estimation method for the high-speed coherent WDM PON based on the reflective semiconductor optical amplifier (RSOA). By using this method, we can utilize a cost-effective DFB laser as the seed light in such a network due to its fast trackability. We experimentally achieve an excellent receiver sensitivity of −30.8 dBm even when a DFB laser (linewidth: 3 MHz) is used...
We evaluate the transmission performances of 28-Gb/s polar RZ PAM-N (N=2, 3, 4, and 5) upstream signals in 20-km long loopback SSMF link by using a directly-modulated RSOA and direct-detection receiver.
We report a 2 Gb/s bidirectional real-time data transmission with bit error rate (BER) $<1\times 10^{-10}$ in a 50 m step-index polymer optical fiber link. The system is able to transmit 5 Gb/s using five channels. The system performance is tested using the most restrictive channels with the shortest and longest wavelengths in a real-time Ethernet link. The implementation takes an advantage of...
We demonstrate, for the first time, amplification of a DP-QPSK signal using a vector phase-sensitive amplifier (PSA). The PSA-based receiver shows an about 0.7 dB sensitivity improvement compared to an EDFA-based receiver.
We demonstrate a coherent OFDM-PON based on a simplified coherent receiver, which exploits a DFB local oscillator without phase/frequency locking. We achieve ultra-narrow channel spacing (Δν = 1.6 GHz) and high-power budget (43 dB/35 dB) for 1.25/10 Gb/s.
A high-level optical access network based on coherent technology supporting ultra-dense Wavelength Division Multiplexing (WDM) is developed in the EU FP7 COCONUT project (COst-effective COherent ultra-dense-WDM-PON for lambda-To-the-user access networks). The COCONUT network should allow for seamless evolution from present PON architectures, and also support new emerging applications such as mobile...
We generate the QPSK signal by utilizing the chirp characteristics of the directly modulated RSOA for the high-speed coherent WDM PON. In addition, we demonstrate the error-free transmission of the 5-Gbps QPSK signal generated by using this technique over 100-km long fiber link without using any optical amplifiers and electronic equalizers.
Bidirectional transmission at 10 Gbit/s using 3.125 GBaud PDM-QPSK over 100 km of SMF is investigated. We observe no penalty for transmission of 10 GHz spaced channels. Preamplification improves the receiver sensitivity from -45.9 dBm to -53.0 dBm.
We report on ultra-long haul transmission of polarization-switched QPSK (PS-QPSK) and polarization-multiplexed BPSK (PM-BPSK) at 42.9Gbit/s per WDM channel. Although achieving similar transmission distances in excess of 13,600km, PS-QPSK offers a significant reduction in receiver complexity due to a lower symbol-rate.
We propose FSK/ASK re-modulation WDM-PON with coherent receiver. Apparent BER improvement is obtained by utilizing FSK image rejection receiver, especially for long distance transmission. Parameters in image rejection receiver which affect the system performance are analyzed. Results show that the presented scheme is promising in super long reach access network.
We demonstrate simultaneous demodulation of multiple 40 Gbit/s WDM NRZ-DPSK channels using a single silicon microring resonator with FSR of 100 GHz. Bit error measurements show very good performances for both through and drop demodulations for all channels.
We propose and demonstrate a 1.25-Gb/s RSOA-based WDM PON employing a novel self-homodyne receiver. The proposed receiver enables the excellent receiver sensitivity and reflection tolerance, and has potential applications in the long-reach WDM PON with high-split ratio.
We successfully demonstrate a digital lightpath labeling technique, LightLabel, for DPSK. Two DPSK modulation schemes and OOK are compared experimentally. The technique offers cost-effective lightpath management for photonic networks.
We propose and experimentally demonstrate a novel coding scheme for a WDM-PON system using ASK/DPSK re-modulation corresponding to downstream/upstream signals respectively to enhance the toleration of injection signal extinction ratio.
Fast polarization changes of 40 krad/s (and 6 dB PDL) are tracked in a 2.8 Gb/s realtime coherent QPSK receiver with 0.7 dB (2.4 dB) sensitivity degradation.
We propose a novel maximum a posteriori probability (MAP) detector in coherent WDM systems, which exhibits significant improvement in back-to-back receiver sensitivity, chromatic dispersion and phase misalignment tolerance.
We investigate 10-Gb/s uncooled, directly modulated free-running 1.55-mum VCSEL transmission for WDM-PONs. Wavelength variation with bias current and dispersion tolerance are evaluated for WDM-PON transmission. Errorfree transmission over 10-km SMF and 80-km SMF+DCF have been demonstrated.
In this study the author has modeled and characterizes the performance of 3times10 Gbp/s absolute polar duty cycle division (APDCDM) multiplexing in dispersive environments at 1550 nm. APDCDM technique is examined, with comparison to non-return-to-zero (NRZ) and return-to-zero (RZ) time division multiplexing. In this paper three channel operating at the same speed of 10 Gbps are multiplexed in electrical...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
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