Transmitter optical module outputting an optical signal containing two or more wavelengths

摘要

A transmitter module is disclosed, where the transmitter module includes optical sources, an optical multiplexer to multiple optical signals each output from optical sources, an optical detector to detect an output of the optical multiplexer, and a controller. The controller alternately superposes a dither signal on a bias current provided to the optical source, and the bias current is controlled based on a magnitude of the dither signal, which is detected by a configuration similar to the lock-in amplifier.

主权项

1. A transmitter optical module, comprising:
a plurality of semiconductor laser diodes (LDs) each emitting an optical signal with a wavelength specific thereto and different from others; an optical multiplexer configured to multiplex optical signals into a multiplexed optical signal; a semiconductor photodiode (PD) configured to receive the multiplexed optical signal and generate a detected signal; an extractor including an electrical signal source to provide an electrical signal having a specific frequency, a delay unit configured to adjust a phase of the electrical signal and a multiplier; and a controller including a plurality of auto-power control (APC) circuits each corresponding to the LD and providing a bias current to the LD corresponding thereto, wherein the electrical signal is superposed on the bias current one after another and the extractor extracts a component having the specific frequency by multiplying the electrical signal whose phase is adjusted by the delay unit with the detected signal, the bias current being determined by the component extracted by the extractor.