InP-Based Monolithic Optical Frequency Discriminator Module for WDM Systems

Ken TSUZUKI  Hiroaki TAKEUCHI  Satoshi OKU  Masahiro TANOBE  Yoshiaki KADOTA  Fumiyoshi KANO  Hiroyuki ISHII  Mitsuo YAMAMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.8   pp.1454-1459
Publication Date: 1999/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Optical Active Devices and Modules
temperature insensitive filter,  Mach-Zehnder filter,  feedback,  frequency trimming,  

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We have developed an InP-based monolithic optical frequency discriminator consisting of a temperature-insensitive optical filter and dual photodiodes. This integrated device detects the optical frequency deviation of the input light as differential photocurrent from the dual photodiodes, and the photocurrent is fedback to the light source for frequency stabilization through a differential amplifier. The FSR and extinction ratio of the filter are 50 GHz and 20 dB. The total opto-electronic conversion efficiency is 40%. In a frequency stabilization experiment using the developed discriminator, the frequency fluctuation of a DFB laser was reduced to less than 10 MHz.