Tunable Optical Equalizer Using Diffraction Grating Filters

Author

Zhao, Xiaoxue ; Hasebe, Koichi ; Sakaguchi, Takahiro ; Koyama, Fumio ; Chang-Hasnain, Connie J. ; Nishiyama, Nobuhiko ; Caneau, Catherine ; Zah, Chung-en

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, CA

Volume

20

Issue

18

fYear

2008

Firstpage

1590

Lastpage

1592

Abstract

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 LiNO₃ modulators 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.

Keywords

band-pass filters; diffraction gratings; laser cavity resonators; laser mirrors; laser tuning; lithium compounds; optical filters; optical modulation; surface emitting lasers; LiNbO₃; LiNbO₃ modulator; bandwidth enhancement; diffraction grating filters; direct-modulated VCSEL; frequency response; intensity-modulated light source; passband profile; patterned mirrors; tunable bandpass filter; tunable optical equalizer; vertical-cavity surface-emitting laser; Band pass filters; Bandwidth; Diffraction gratings; Equalizers; Mirrors; Optical diffraction; Optical filters; Optical modulation; Tunable circuits and devices; Vertical cavity surface emitting lasers; Equalizer; filters; grating; lasers; modulation;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.928853

Filename

4603057