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Chirp reduction using push-pull modulation of three-contact lasers

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4 Author(s)
Nowell, M.C. ; Dept. of Eng., Cambridge Univ., UK ; Zhang, L.M. ; Carroll, J.E. ; Fice, M.J.

Low-chirp modulation of three-contact distributed-feedback (DFB) lasers is experimentally demonstrated, using a push-pull modulation scheme. When the laser was modulated with a 2.0-Gb/s pseudorandom bit sequence, the -20-dB linewidth was measured to be 0.055 nm after deconvolving the measurement equipment's response. The results are simulated using a large-signal time-domain model that illustrates the mechanisms responsible for the low chirp. The grating structure is shown to have a significant effect on the performance of the device under push-pull modulation.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 12 )