Title:
BIT-RATE AND FORMAT INSENSITIVE ALL-OPTICAL CLOCK EXTRACTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO2002032027
Kind Code:
A3
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage (150) preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal (100) is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm (105, 106) of an asymmetric interferometric device. The output (103) of the processing stage is fed to a clock recovery stage (160), which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources (113, 114) to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms (111, 112) of an interferometer, with two DFB lasers (113, 114) as terminuses. The output (115) of the interferometer is an optical clock signal at the clock rate of the original input.
Inventors:
DAVE BHARAT
ENGIN DORUK
KIM KWANG
LAHAM MOHAMMAD
MARTINEZ JULIO
NEDZHVETSKAYA OLGA
SARATHY JITHAMITHRA
SIMPRINI RONALD
STEFANOV BORIS
THAI TAN
ENGIN DORUK
KIM KWANG
LAHAM MOHAMMAD
MARTINEZ JULIO
NEDZHVETSKAYA OLGA
SARATHY JITHAMITHRA
SIMPRINI RONALD
STEFANOV BORIS
THAI TAN
Application Number:
PCT/US2001/031000
Publication Date:
February 27, 2003
Filing Date:
October 04, 2001
Export Citation:
Assignee:
ALPHION CORP (US)
International Classes:
H04B10/299; H04L7/00; (IPC1-7): G02B6/293
Foreign References:
| US6118564A | 2000-09-12 | |||
| EP0901245A1 | 1999-03-10 | |||
| US5434692A | 1995-07-18 | |||
| JPH11101922A | 1999-04-13 |
Other References:
LEE ET AL.: "All-fiber-optic clock recovery from non-return to zero format data", OFC'98 TECHNICAL DIGEST, February 1998 (1998-02-01), pages 205 - 206, XP002958245
JINNO M. ET AL.: "All-optical timing extraction using a 1.5 micrometer selfpulsating multielectrode DFB LD", ELECTRONICS LETTERS, vol. 24, no. 23, 10 November 1998 (1998-11-10), pages 1426 - 1427, XP002958246
LEE ET AL.: "Passive all optical non-return-to-zero to pseudo-return-to-zero signal conversion for all optical clock recover", LEOS 96, vol. 2, November 1996 (1996-11-01), pages 113 - 114, XP000953661
JINNO M. ET AL.: "All-optical timing extraction using a 1.5 micrometer selfpulsating multielectrode DFB LD", ELECTRONICS LETTERS, vol. 24, no. 23, 10 November 1998 (1998-11-10), pages 1426 - 1427, XP002958246
LEE ET AL.: "Passive all optical non-return-to-zero to pseudo-return-to-zero signal conversion for all optical clock recover", LEOS 96, vol. 2, November 1996 (1996-11-01), pages 113 - 114, XP000953661
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