Optical spectrum analyzer and method for controlling output of optical amplifier
AssigneeNEC Corporation
InventorTakashi Ono
Life of this patent
Estimating the term…
Abstract
Disclosed is an optical spectrum analyzer which has: a pulse oscillator for generating a pulse; an optical switch for switching a signal light in response to the pulse; an optical circulator which has at least three input-output ports and in which the output of the optical switch is connected to a first port of the optical circulator; a plurality of fiber gratings which are in series connected to a second port of the optical circulator to which a signal light entered into the first port is output, the fiber gratings having different Bragg wavelengths, respectively; and an optical detector which is connected to a third port of the optical circulator to which a reflected light from the fiber gratings is output.
Claims6
An optical spectrum analyzer, comprising:
- a pulse oscillator for generating a pulse;
- an optical switch for switching a signal light in response to said pulse;
- an optical circulator which has at least three input-output ports and in which the output of said optical switch is connected to a first port of said optical circulator;
- a plurality of fiber gratings which are in series connected to a second port of said optical circulator to which a signal light entered into said first port is output, said fiber gratings having different Bragg wavelengths, respectively;
- and
- an optical detector which is connected to a third port of said optical circulator to which a reflected light from said fiber gratings is output.
An optical spectrum analyzer, comprising:
- a pulse oscillator for generating a pulse;
- an optical switch for switching a signal light in response to said pulse, said optical switch having at least two input ports and one output port;
- a plurality of fiber gratings which are in series connected to output port to which a signal light entered into a first port of said optical switch is outout when said optical switch turns ON, said fiber gratings having different Bragg wavelengths, respectively;
- and
- an optical detector which is connected to a second input port of said optical switch to which a reflected light from fiber gratings is output when said optical switch turns OFF.
A method for controlling the gain, output power and optical band property of an optical amplifier used in a wavelength division multiplexing system, comprising the steps of:
- detecting the number of channels of signal lights output from said optical amplifier by means for analyzing an optical spectrum;
- and
- controlling the output power of a pumping laser such that it falls under a predetermined power value in response to said number of wavelengths.
Dependencies are inferred from the claim text.