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Fast spectral improvement in picosecond pulses generated from a DFB laser diode using a loosely coupled external cavity

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2 Author(s)
Chow, K.K. ; Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, China ; Shu, C.

A simple external cavity is constructed to provide adjustable feedback to a gain-switched distributed feedback laser diode. A 27-dB enhancement in the sidemode suppression ratio (SMSR) and a 0.3-nm reduction in the spectral linewidth have been observed. The improvement shows a saturation behavior when the feedback power reaches about -16 dBm. We report on the evolution and the dynamics of the spectral improvement. The steady state can be achieved as soon as four round-trip feedback cycles are completed. Dependences of the speed of improvement and the SMSR on the feedback pulse arrival time are also investigated. The optimal result can be obtained over a sensitive time window of about 20 ps.

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 4 )

Date of Publication:

April 2001

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