In this report, we experimentally demonstrate efficient optical 3R regeneration of 40-Gb/s degraded data signals by using
two schemes. The first 3R regenerator incorporates a dual-ring injection mode-locked fiber ring laser as the clock
recovery module and an electro-absorption modulator (EAM) as the decision gate and the other 3R regenerator consists
of an amplified feedback laser (AFL) for all-clock recovery and a semiconductor optical amplifier delayed interferometer
(SOA-DI)as the optical decision gate. Optical clock with low timing jitter and uniform amplitude are successfully
extracted with the use of the clock recovery units and significant improvement of the signal quality are obtained from
40-Gb/s RZ data signals degraded by polarization mode dispersion(PMD), chromatic dispersion or noise of amplified
spontaneous emission (ASE).
A novel all-optical wavelength converter for nonreturn-to-zero systems based on a nonlinear polarization switch (NPS) and a delayed interferometer (DI) is proposed and demonstrated experimentally. The performance of the proposed wavelength converter is compared with the performance of a conventional wavelength converter that only incorporates a NPS. Results show that the quality of the converted signal is significantly improved by inserting a DI after the NPS. The transmission performance of the wavelength-converted signal is also improved by the DI.
All-optical clock recovery is a key technology in all-optical 3R signal regeneration (Re-amplification, Retiming, and Reshaping) process. In this paper, a monolithic integrated three-section amplified feedback semiconductor laser (AFL) is demonstrated as an all optical clock regenerator. We fabricated a three-section AFL using quantum well intermixing process without regrowth instead of butt-joint process. The tunable characteristics of three-section AFL were investigated, and all optical clock recovery for 40Gb/s return to zero (RZ) 231-1 pseudorandom binary sequence (PRBS) is demonstrated experimentally using AFL with time jitter about 689.2fs.
A partly gain-coupled ridge varied two-section DFB self-pulsation laser for optical microwave generating
has been fabricated. It produces microwave with a wide tuning range of more than 135GHz. A successful
locked to the microwave frequencies of 30GHz, 40GHz, 50GHz, 60GHz are demonstrated and a timing
jitter below 300fs is detected.
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