We report the experimental comparison of 10.7-Gb/s duobinary transmissions using generic Reed-Solomon forward error correction (FEC) and an enhanced FEC. The coding gains of the two FECs after transmission over a dispersion-uncompensated 200-km standard single-mode fiber (SSMF) link are found to be much larger than those quoted in ideal case, with the enhanced FEC further outperforming the generic FEC by /spl sim/3.5 dB. Numerical simulations show reasonable agreement with the experimental results.
"CD induces pulse-broadening, causes intersymbol interference, and adds complexity to clock recovery due to the radio-frequency (RF) fading of clock components . Point-to-point uncompensated transmissions have been achieved with prechirping , duobinary modulation , and forward error correction coding . Cascaded operation of optical 2R regeneration achieved 3600-km uncompensated transmission through single-mode fiber at 2.5 Gb/s . "
[Show abstract][Hide abstract] ABSTRACT: We propose an optical 3R regenerator that incorporates a clock enhancement stage based on a semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer and a 10-GHz all-optical clock recovery module employing a Fabry-Perot filter and an SOA. The experiments assess the optical 3R regeneration technique using a fiber recirculation loop containing 125-km dispersion uncompensated large effective area fiber with a total chromatic dispersion of 531.25 ps/nm. The optical 3R regeneration achieves error-free 125 000-km dispersion uncompensated return-to-zero transmission at 10 Gb/s over 1000 optical 3R stages. The bit-error-rate (BER) measurements show that there is only 1.2-dB power penalty at 10<sup>-9</sup> BER between 125 000-km (Lap 1000) uncompensated transmission and back-to-back using pseudorandom bit sequence 2<sup>23</sup>-1
[Show abstract][Hide abstract] ABSTRACT: Techniques for static and dynamic compensation of signal distortions from chromatic dispersion and PMD are outlined. System requirements and transmission design using these compensation techniques are discussed.
Optical Fiber Communication Conference, 2004. OFC 2004; 03/2004
[Show abstract][Hide abstract] ABSTRACT: We demonstrate a receiver, which improves the back-to-back (b-t-b) performance of optical duobinary signals at 10 Gb/s. The required optical signal-to-noise ratio for a bit-error rate of 1×10<sup>-3</sup> was found to be as low as 10.8 dB in b-t-b operation. We tested the receiver with two commercially available 10-Gb/s duobinary transmitter samples. Excellent chromatic dispersion tolerance was maintained with the novel receiver design.
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