Control apparatus for optical amplifier

Details Control apparatus for optical amplifier Control apparatus for optical amplifier

1996-04-15

1998-10-13

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359194, 359337, H04B 1012, H01S 3131

Patent

active

058221123

ABSTRACT:
A control apparatus for an optical amplifier such as an erbium-doped optical-fiber (EDF) amplifier suppresses overshooting of ALC control at power on and at the time of input light restoration from an off condition, while ensuring quick starting. At power on and at the time of input light restoration from an off condition, an idling current (IDC) reference value generating circuit generates an IDC reference voltage that increases to a value sufficiently greater than a value in a normal operating condition with a time constant corresponding to a rise time of the EDF, and thereby controls a laser diode for pumping the EDF. The voltage may be set to a value larger than the value in the normal operating condition for a predetermined period of time by using a timer.

REFERENCES:
patent: 5163063 (1992-11-01), Yoshikawa et al.
patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5528404 (1996-06-01), MacKichan
patent: 5570227 (1996-10-01), Nabeyama et al.

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