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US 2003/0152319 A1Published application
Interference filter for optical telecommunication
AssigneeJDS Uniphase Corporation
InventorsTimothy C. Munks, Andrew Finch, Scott Merritt
Life of this patent
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Abstract
A micro-optic Mach-Zehnder interferometer with a differential delay of n bit periods, where n is an integer number, and thermal bias control is useful as a spectral filter in front of a differential detection system to accomplish a balanced receiver. The interferometer may also be arranged as a Michelson interferometer or a dual-plate interferometer.
Claims17
An interference filter for introducing a relative delay between components of an input optical signal, the filter comprising:
- an input port for launching the input signal,
- an optical splitter,
- an optical combiner,
- a first optical path connecting an output of the optical splitter to an input of the optical combiner, a second optical path connecting a second output of the optical splitter to a second input of the optical combiner,
- a first photodetector for receiving light from a first output port of the optical combiner, a second photodetector for receiving light from a second output port of the optical combiner, wherein
- a) the optical propagation delay for light travelling from the first output port of the optical splitter to the first input port of the optical combiner differs from the optical propagation delay for light travelling from the second output port of the optical splitter to the second input port of the optical combiner by an integral number of bit periods of the input optical signal,
- b) the response of the first photodetector is combined with the response of the second photodetector in a negative linear combination, and
- c) at least one of the optical paths is unguided.
5 more elements
Dependencies are inferred from the claim text.