Method and apparatus for measuring Raman gain, method and...

Details Method and apparatus for measuring Raman gain, method and... Method and apparatus for measuring Raman gain, method and...

2005-08-23

2005-08-23

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

06934016

ABSTRACT:
A Raman amplifier of the present invention includes a loss measuring unit (110) for measuring loss distribution of an object of measurement by OTDR based on reflected light with respect to outputted test light; an optical coupler (114) in which the test light is supplied to a first input terminal thereof and one of output terminals thereof is connected to an optical fiber transmission line; a wavelength filter (116) inserted between the loss measuring unit (110) and the optical coupler (114); a control circuit (200) for generating a control signal for reducing an error signal obtained by comparing a Raman gain obtained with a reference value; and an excitation light source (140) for changing an excitation light power based on the control signal.

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Optic Letters, vol. 15, No. 21, Nov. 1, 1990, pp. 1200-1202.

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