Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers
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United States of America Patent
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Sep 27, 2011
Grant Date -
Aug 14, 2008
app pub date -
Feb 8, 2008
filing date -
Feb 8, 2007
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Abstract
. The small signal model can be used to derive an inverse response for designing slow chirp compensation means. Slow chirp compensation means include electrical compensation, optical compensation, or both. Slow chirp electrical compensation can be implemented with an LR filter or other RF circuit coupled to a direct modulation source (e.g., a laser driver) and the directly modulated laser. Slow chirp optical compensation can be implemented with an optical spectrum reshaper having a rounded top and relatively large slope (e.g., 1.5-3 dB/GHz). The inverse response can be designed to under-compensate, to produce a flat response, or to over-compensate.
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