Retrofit heater for erbium fiber in an erbium-doped fiber amplif

Details Retrofit heater for erbium fiber in an erbium-doped fiber amplif Retrofit heater for erbium fiber in an erbium-doped fiber amplif

1999-06-21

2000-11-14

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359177, 372 34, H04B 1004, G02B 636

Patent

active

061477958

ABSTRACT:
A heater system for heating an erbium-doped fiber amplifier (EDFA) of a fiber optic communication system operable in an environment. The heater system includes a pump laser for providing optical power to an erbium fiber in the EDFA. The pump laser is cooled by a thermoelectric cooler (TEC) when a predetermined maximum temperature is reached to maintain the temperature of the laser below the maximum temperature value. The temperature of the laser is sensed by a temperature sensor and is conveyed to a control circuit for generating a control signal. A heater unit is thermally connected to the erbium fiber and is controlled by the control signal in the event that the sensed temperature falls below a predetermined minimum value to maintain the temperature of the fiber above the minimum temperature value. A switch is connected between the control circuit, the TEC and the heater to automatically direct current to either the heater or the TEC depending on the sensed temperature.

REFERENCES:
patent: 5541766 (1996-07-01), Mizrahi et al.
patent: 5859945 (1999-01-01), Kato et al.
patent: 5943152 (1999-08-01), Mizrahi et al.
AT&T, Preliminary Data Sheet for 1718-Type EDFA Gain Block, 3 pages, Feb. 1996.
Lee et al, OFC '98, vol. 21 pp. 133-134, 1988 OSA Tech. Digest; Abstract Provided Herewith with atill, Feb. 27, 1998.
Shah et al, 1992 Proc. 42nd Electr. Comp. etech., pp. 842-847; Abstract only herewith, May 20, 1992.
Proc. 1992 IEICE Fall Conf., Part 4, pp. 282, Sep. 30, 1992.

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