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Abstract
The multichannel chirp compensation of a hybrid pulsed carrier with dense wavelength division multiplexing/ time-division multiplexing (DWDM/TDM), generated from a mode-locked weak-resonant-cavity Fabry-Perot laser diode (WRC-FPLD) fiber ring under 10-GHz dark-optical-comb injection, is demonstrated with a DWDM channel spacing of 200 GHz. This was implemented by selecting the least-common-multiple repetition frequency in the WRC-FPLD and fiber ring dual cavity. With a chirp parameter of for the WRC-FPLD-based fiber ring, the absolute value of the negative frequency chirp could be linearly suppressed from to with the pulse duration varying from 27 to 20 ps. By using a tunable band-pass filter, nine DWDM channels located between 1533.4 and 1546.2 nm were selected for dispersion compensation within a 55-m long diode fiber ring segment. The original pulsewidth varied from 21.7 to 17 ps for different channels. After chirp compensation, an auto-correlation diagnosis showed that the all-channel pulsewidths of mode-locked WRC-FPLD fiber ring laser changed only from 7.8 to 9.1 ps. The single-channelized WRC-FPLD pulsewidth after linear dispersion compensation and fifth-order soliton compression could be to shortened to 7.8 and 1.4 ps, respectively.
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