COMPACT WDM OPTICAL MODULES

摘要

Methods, systems, and apparatus, for optical communication. One apparatus includes a Fabry-Perot (FP) laser diode assembly coupled to a first port of a circulator; an optical amplifier coupled to a second port of the circulator; a wavelength division multiplexer (WDM) filter coupled to a third port of the circulator; and a Faraday rotator mirror coupled to the WDM filter.

主权项

1. An optical assembly comprising:
a Fabry-Perot (FP) laser diode; a first collimating lens coupled to an optical output end of the FP laser diode; a polarization beam splitter (PBS) coupled at a first end to receive the collimated optical signal with matched polarization from the first lens; a second collimating lens coupled to the optical output from a first end of the PBS and to focus the optical output into a first end of an optical fiber positioned at a second end of the second collimating lens; a first mirror coupled to receive an optical output from the PBS; a half wave plate coupled to receive an optical output from the first mirror; a second mirror coupled to receive an optical output from the half wave plate; a third mirror coupled to receive an optical output from the second mirror; a third collimating lens coupled to receive an optical output from the third mirror; an optical amplifier coupled on a first end to receive an focused optical output from the third collimating lens and configured to output from a second end an optical signal to the FP laser diode, wherein an optical input received at the second collimating lens from the optical fiber is a reflected optical signal from the FP laser diode that passes through the second collimating lens, has a polarization such that it is reflected by the PBS by substantially 90 degrees, is folded by substantially 90 degrees by the first mirror, passes through the half-wave plate such that the signal is rotated to match the polarization of the optical amplifier, is folded by the second mirror by substantially 90 degrees, is further folded by the third mirror by substantially 90 degrees, passes through the third collimating lens, passes through the optical amplifier, and then is injected into the rear facet of the FP laser diode.