Method and apparatus for optically filtering a communication signal

摘要

There is provided a method and apparatus for optically filtering a communication signal. More specifically, in one embodiment, there is provided an apparatus comprising an optical filter having first and second input ports and first and second output ports, the optical filter being configured to transmit light in a target frequency range to the first output port in response to receiving light at the first input port and being configured to transmit light in the target frequency range to the second input port in response to receiving light at the second output port, and first and second photodiodes, the first diode being located to be illuminated by light from the first output port and the second photodiode being located to be illuminated by light from the second input port.

主权项

1. An apparatus comprising:
an optical filter having first and second input ports and first and second output ports being part of the optical filter, the optical filter being configured to receive an optical beam pair comprising a first optical beam and a second optical beam having opposite polarities and transmit the first optical beam in a first direction through a first frequency dependent phase shifter configured to alter a phase of the first optical beam to the first output port in response to receiving the first optical beam at the first input port and being configured to transmit the second optical beam in a direction opposite to the first direction through a second frequency dependent phase shifter configured to alter a phase of the second optical beam to the second input port in response to receiving the second optical beam at the second output port; and first and second photodiodes, the first photodiode being located to be illuminated by light from the first output port and the second photodiode being located to be illuminated by light from the second input port.