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AssigneeFinisar Corporation
InventorsJianying Zhou, Xueyan Zheng, Kevin J. McCallion, Daniel Mahgerefteh, Hongmin Chen, Guoxi Sun, Parviz Tayebati
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The frequency chirp modulation response of a directly modulated laser is described using a small signal model that depends on slow chirp amplitude s and slow chirp time constant τs. 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.
An optical transmitter with slow chirp compensation, comprising:
A method for reducing slow chirp, comprising:
The method of claim 10, further comprising, prior to compensating slow chirp, calculating the inverse response of the slow chirp using the equation of claim 11.
Dependencies are inferred from the claim text.