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A tunable bandpass filter is constructed using patterned mirrors and a diffraction grating to serve as an optical equalizer. The frequency response of an intensity-modulated light source can be tailored by the passband profile of the equalizer to achieve a larger 3-dB bandwidth. We demonstrate that the 3-dB bandwidth of two LiNO3modulators is increased from 10 and 25 GHz to 45 and >70 GHz, respectively, by applying the optical equalizer. We also show preliminary results on bandwidth enhancement of a direct-modulated vertical-cavity surface-emitting laser using the optical equalizer.
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Zhao et al. (2008) studied this question.
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