WAVELENGTH LOCKER MODULE AND METHOD OF STABILIZING LIGHT EMITTING WAVELENGTH OF LASER LIGHT SOURCE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a wavelength locker module and a method of stabilizing the light emitting wavelength of laser light source using the module to cover a plurality of wavelength-multiplexed signal light rays so as to make the module suitable for WDM communication. SOLUTION: Measuring light constituting part of the signal light ray from a DFB laser light source 10 is emitted from the end face of an optical fiber 16 and transformed into parallel light rays through a collimator lens 20. After the parallel light rays are divided into two parts through a roof prism 22, one part of the divided parallel light rays is made incident to a photodiode PD1 through an etalon 24 and outputs a current signal I1. At the same time, the other part is made incident directly to another photodiode PD2 and outputs another current signal I2. The current signals I1and I2are inputted to a control circuit 26. The circuit 26 detects the current signal I1corresponding to the quantity of light transmitted through the etalon 24 and the current signal I2-I1corresponding to a light quantity equivalent to the quantity of reflected light, and calculates the fluctuation of the light emitting wavelength of the light source 10 based on the current signals I1and I2-I1. COPYRIGHT: (C)2003,JPO