Wavelength division multiplex optical ring network

Details Wavelength division multiplex optical ring network Wavelength division multiplex optical ring network

2004-11-22

2011-11-08

Liu, Li (Department: 2613)

Optical communications

Diagnostic testing

Fault detection

C398S059000, C398S009000, C398S017000, C398S025000, C398S034000, C398S037000, C398S038000, C398S083000, C398S092000, C398S177000, C398S180000

Reexamination Certificate

active

08055127

ABSTRACT:
A wavelength division multiplex optical ring network comprises optical fibre (1-4) arranged in a ring configuration and a plurality of doped fibre optical amplifiers (17-20) arranged in the ring. The spectral response in the ring is configured such in use amplified spontaneous emission (ASE) noise circulates around the ring in a lasing mode to clamp the gain of each doped fibre optical amplifier. Each optical amplifier (17-20) includes respective control means (28) which in use control the optical amplifier to produce a substantially constant output power or to maintain a substantially constant pump power. In the event of loss of the lasing peak, detection means switches the doped fibre optical amplifiers to a different mode of gain control, for example, a mode to produce constant gain at the value before the loss of the lasing peak. Optionally, after a predetermined delay, the optical amplifiers may revert to constant output power or pump power mode. Loss of the peak could be detected by a peak detection circuit (27), which filters by means of filter (26) a fraction of the input or output power of the optical amplifier using splitters and/or by detection of a drop in amplifier input power.

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patent: WO 02/080409 (2002-10-01), None
Salehee: “Closed Cycle Lasing of ASE Noise in a WDM Ring Network”, CLEO/Pacific Rim 2001, Jul. 15-19, 2001, vol. 2, pp. II-558-II-559
Okamura, Haruo. “Automatic Optical Loss Compensation with Erblum-Doped Fiber Amplifier.” Journal of Lightwave Technology, IEEE, New York, US, vol. 10, No. 8, Aug. 1, 1992, pp. 1110-1116, XP000288348. ISSN: 0733-8724.

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