Optical amplifier gain control circuitry using a variable refere

Details Optical amplifier gain control circuitry using a variable refere Optical amplifier gain control circuitry using a variable refere

1997-06-05

1998-11-17

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359124, 359160, 359177, H04B 1016, H04B 1017, H01S 316

Patent

active

058384880

ABSTRACT:
In an optical line repeater, a gain-controlled optical amplifier provides amplification of a wavelength division multiplex (WDM) signal from an incoming optical transmission link to compensate for signal attenuation. The amplified WDM signal is split into first and second replicas and the first replica is forwarded onto an outgoing optical transmission link. The second replica is used to determine the number of wavelength components actually multiplexed in the amplified WDM signal. A reference voltage is produced corresponding to the determined number of wavelength components. The difference between the reference voltage and the intensity of the amplified WDM signal is then detected and the gain of the optical amplifier is controlled with the detected difference so that the difference reduces to a minimum. The reference voltage automatically varies with the number of actually transmitted wavelength components to maintain the output power of each wavelength component constant.

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patent: 5600473 (1997-02-01), Huber
patent: 5680247 (1997-10-01), OKuno
Nolrabayashi et al, Technical Report of IE ICE, OCS94-66, OPE 94-89, pp. 1994-11.

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