Optical fiber amplifier

Details Optical fiber amplifier Optical fiber amplifier

1996-09-06

1998-11-10

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359134, 359337, 359345, H04B 1000, H04B 1017, H01S 306

Patent

active

058352597

ABSTRACT:
An amplifying optical fiber (111) whose wavelength dependency of gain is approximated by a second-order function of wavelength in which the coefficient of square term of wavelength is a negative value and an amplifying optical fiber (112) whose wavelength dependency of gain is approximated by a second-order function of wavelength in which the coefficient of square term of wavelength is a positive value are cascaded to each other. The amplifying optical fiber (112) is realized as the kind and amount of co-dopant element are appropriately selected. To these amplifying optical fibers, pumping light is supplied by way of fiber type couplers (123, 132) after the light intensities of the pumping light output from pumping light sources (121, 131) are adjusted by light intensity adjusting devices (122, 132). Input signal light is output after being transmitted through an optical isolator (140), the fiber type coupler (123), the amplifying optical fibers (111, 112), the fiber type coupler (133), and an optical isolator (150) under their respective gain characteristics or transmission characteristics. The overall gain of an optical fiber amplifier (100) combining the individual characteristics of these parts together has substantially a linear characteristic with respect to wavelength.

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