High Isolation and High Return Loss 2-Port Optical Retro-Reflector

摘要

Two-port optical retro-reflectors with high isolation and high return loss are described. Such retro-reflectors are designed to increase the number of optical filtering using one or more filters uniquely disposed to increase the isolation and return loss.

主权项

1. A two-port optical retro-reflector comprising:
a first port for receiving an incoming signal including a first signal and a second signal; a second port; a first filter designed to transmit the first signal and reflect the second signal; a reflector; and a lens directing the incoming signal to the first filter that transmits the first signal and reflects the second signal, wherein the transmitted first signal impinges upon the reflector to cause a reflected first signal to go through the first filter again before the reflected first signal goes to the second port, and the reflected second signal is coupled to the first port.