Optical switch with connection verification

Details Optical switch with connection verification Optical switch with connection verification

2005-03-22

2005-03-22

Sedighian, M. R. (Department: 2633)

Optical communications

Multiplex

Optical switching

C398S049000, C398S050000, C398S051000, C398S054000, C398S057000, C398S056000, C398S016000, C398S033000

Reexamination Certificate

active

06871021

ABSTRACT:
An optical switch is equipped with a set of optical intensity controllers at its input, each intensity controller being driven to vary a corresponding WDM input traffic signal with a low power test signal. The switch is also equipped with optical splitters at its output and a path integrity analyzer connected to the splitters and to the intensity controllers. The path integrity analyzer generates or controls generation of the test signals applied by the intensity controllers. The path integrity analyzer also receives the tapped portions of the WDM output signals and separates them into their single-carrier components in order to recover a set of switched single-carrier optical signals. The path integrity analyzer is further provided with test signal detectors used to detect the presence of a test signal in each recovered switched single-carrier optical signal. The path integrity analyzer thus ascertains the integrity of the connection involving each switched single-carrier optical signal by comparing detected test signals to expected test signals that are derived from a connection map.

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Chu Kwang-Uk et al: “Scalable optical-path supervisory scheme using pilot tones and channel equalisers” Electronics Letters, IEE Stevenage, GB, vol. 36, No. 9, Apr. 27, 2000, pp. 817-818, XP006015153 ISSN: 0013-5194.
Zhong S et al: “Optical Path and Crosstalk Monitoring for Optical Cross Connect Switches Using Arrayed Waveguide Grating” Optical Fiber Communication Conference. (OFC). Technical Digest Postconferene Edition. Baltimore, MD, Mar. 7-10, 2000, New York,NY: IEEE, US, vol. 2 of 4, Mar. 7, 2000, pp. WK5-1-WK5-3, XP001017499 ISBN: 0-7803-5952-6.
Kong E et al: “Pilot-tone based optical-path supervisory scheme for optical cross-connects” Electronics Letters, IEE Stevenage, GB, vol. 35, No. 17, Aug. 19, 1999, pp. 1481-1483, XP006012591 ISSN: 0013-5194.
European Search Report EP 01 30 4669; Jul. 4, 2003.

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