InP-Based Monolithic Optical Frequency Discriminator Module for WDM Systems

摘要

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 pho- tocurrent 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 20dB. The total opto-electronic con- version 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.