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US 2009/0214203 A1Published application
Method and System for Automatic Feedback Control for Fine Tuning a Delay Interferometer
AssigneeFujitsu Limited
InventorsTakeshi Hoshida, Seemant Choudhary
Life of this patent
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Abstract
A method for receiving an optical signal is included where an ingress signal is split into a first portion and a second portion. A relative delay is induced between the first portion and the second portion, which are optically interfered to generate at least one interfered signal. Quality criteria of a monitored signal at least based on the at least one interfered signal is monitored so that a relative delay based in the quality criteria may be adjusted.
Claims20
A method comprising:
- receiving a signal at an optical receiver, the signal encoded with information;
- splitting, by the optical receiver, the signal into a first portion and second portion;
- inducing, by the optical receiver, a relative delay between the first portion and the second portion;
- optically interfering, by the optical receiver, the first portion and the second portion to generate one or more interfered signals;
- monitoring, by the optical receiver, an optical power of at least one interfered signal of the one or more interfered signals by measuring a Direct Current (DC) voltage of the at least one interfered signal;
- adjusting, by the optical receiver, the relative delay based on the optical power;
- and
- decoding, by the optical receiver, the information encoded in the signal.
5 more elements
An optical receiver comprising:
- a delay interferometer configured to:
- receive a signal, the signal encoded with information;
- split the signal into a first portion and second portion;
- induce a relative delay between the first portion and the second portion;
- optically interfere the first portion and the second portion to generate one or more interfered signals;
- a signal monitor configured to monitor an optical power of at least one interfered signal of the one or more interfered signals by measuring a Direct Current (DC) voltage of the at least one interfered signal;
- and
- a processor configured to:
- adjust the relative delay based on the optical power;
- and
- decode the information encoded in the signal.
8 more elements
An optical receiver comprising:
- a delay interferometer configured to:
- induce a relative delay between a first portion and a second portion of a signal encoded with information, the signal encoded according to differential phase shift keying (DPSK) with bit synchronous intensity modulation (IM);
- optically interfere the first portion and the second portion to generate one or more interfered signals;
- a signal monitor configured to monitor an optical power of at least one interfered signal of the one or more interfered signals by measuring a Direct Current (DC) voltage of the at least one interfered signal;
- and
- a processor configured to:
- adjust the relative delay based on the optical power to maximize the signal;
- and
- decode the information encoded in the signal.
6 more elements
Dependencies are inferred from the claim text.