Juanjuan Yan

Performance evaluation of standard FEC in 40Gbit/s systems with high PMD and prechirped CS-RZ modulation format

In this work, the coding gain and transmission penalty of the standard forward error correction (FEC) are investigated in the 40 Gbit/s systems with high polarization mode dispersion (PMD) and prechirped carrier-suppressed return-to-zero (CS-RZ) format. The simulation results show that the interaction of the second-order and higher-order PMD with fiber nonlinearity induced chirp can improve the performance of FEC.

Performance comparison of standard FEC and enhanced FEC in coded systems with high polarization mode dispersion

This paper numerically compares the performance of 10- Gbit/s standard forward error correction (SFEC) and enhanced forward error correction (EFEC) in coded systems disturbed by high polarization mode dispersion (PMD). The simulation results show that EFEC, based on the concatenated Reed-Solomon codes RS(247, 239) and RS(255, 247), can increase the system PMD tolerance to 70 ps, com- pared with about 40 ps for SFEC, while keeping the PMD-induced power penalty (at a bit error rate of 10 210 ) below 1 dB.

Effect of polarization mode dispersion on a 40-Gb/s RZ bidirectionally pumped Raman-amplified transmission system

We numerically analyze and compare effect of polarization mode dispersion on an optimal 40Gb/s RZ bi-directionally pumped all-Raman and EDFA transmission system. Although bit-error-ratio distribution is similar for both systems, Raman amplified transmission system shows a higher tolerance to polarization mode dispersion due to a relatively lower bit-errorratio base induced only by nonlinear effects.

Performance analysis of nonlinear optically amplified IM/DD systems with forward error correction

In this paper, a nonlinear, optically amplified intensity modulated direct detection (IM/DD) system model with forward error correction (FEC) is presented, where the FEC scheme is based on Reed-Solomon (255,239) coding; the system performance is numerically evaluated and the dependence of FEC coding gain and transmission penalty on system parameters is investigated. The results show that FEC can greatly improve the system performance regardless of changes in system parameters.

Protection scheme in NSFCNET

Protection and restoration issues in optical networks especially DWDM networks are attracting significant attention for future high-capacity transport applications. In this paper a flexible protection scheme of BWLSR/2 (Two-fiber Bi-directional Wavelength Line Switched Ring)/1/ is demonstrated, this protection system can function automatically without the interference of the network management system. In the case of fiber broken or single channel transport problem it can protect the optical signal. It is implemented successfully in the NSFCNET.

10-Gb/s optical Internet network with 16-channel bidirectional DWDM transmission system

10Gb/s optical internet network (NSFCnet) in china with protection switching function and performance monitoring is introduced in this paper. 16x10Gb/s Transmission is demonstrated over 400km SMF with 3 network elements consisting of multiplxers and demultiplxers. The power penalties for all 16 channels are measured to be less than 2dB (BER=10-10).

Programmable optical add/drop multiplexer with enhanced temperature sensitivity

Abstract Thermally tunable optical add/drop multiplexer (OADM) with enhanced temperature sensitivity by a simple package method is presented in this paper. Using this programmable OADM, the dynamical routing of 16×10 Gb/s traffic is realized through the control signals coming from the network management.

Performance improvement of optically amplified systems using out-of-band forward error correction

Forward error correction (FEC) is one of the newest technologies improving the performance of optical transmission systems. Out-of-band FEC providing high coding gain is the FEC type in common use, and RS (Reed-Solomon) coding capable of correcting both bursty errors and random errors is the most efficient coding used in the systems. In this paper, the error-correcting capability of RS codes with various levels of overhead is compared theoretically; the performance of optically amplified systems is analyzed by means of non-Gaussian approximation instead of traditional Gaussion approximation; based on the theory above, the system performance improved by FEC or Enhanced FEC (EFEC) is numerically simulated and discussed respectively with a view to the side-effects of out-of-band FEC due to increased channel bandwidth. Analyzing the performance of optical transmission system with FEC is not new, the contribution of the paper lies in its more precise approach*non-Gaussion approximation, furthermore the side-effects caused by out-of-band FEC are taken into account, by which the potential of FEC in increasing the capacity and improving the performance of optically amplified systems is illuminated more accurately.