Optical power monitor, optical power control system and optical power monitor method
First Claim
1. An optical power monitor that detects optical power of respective wavelengths of a signal light in a wavelength multiplexing system, comprising:
- a light emitter configured to superimpose a frequency modulation component on the signal light;
a wavelength tunable filter configured to sweep a pass band of the signal light across a wavelength band for the signal light; and
a detector configured to detect intensity changes in optical power passing through the wavelength tunable filter with a frequency modulation, and to detect an optical power measurement value at a middle point of two points of the intensity changes of the optical power as the optical power of a wavelength to be measured,wherein the detector includes a filter configured to extract the frequency modulation component and an amplitude detector configured to detect the intensity changes based on the frequency modulation component output from the filter.
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Accused Products
Abstract
An optical power monitor that detects optical power of respective wavelengths of a signal light in a wavelength multiplexing system, includes: a light emitter configured to superimpose a frequency modulation component on a signal light; a wavelength tunable filter configured to sweep a pass band of the signal light across a wavelength band for a signal light; and a detector configured to detect intensity changes in optical power passing through the wavelength tunable filter with a frequency modulation of the optical power, and to detect an optical power measurement value at a middle point of two points of the intensity changes of the optical power as the optical power of a wavelength to be measured.
36 Citations
12 Claims
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1. An optical power monitor that detects optical power of respective wavelengths of a signal light in a wavelength multiplexing system, comprising:
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a light emitter configured to superimpose a frequency modulation component on the signal light; a wavelength tunable filter configured to sweep a pass band of the signal light across a wavelength band for the signal light; and a detector configured to detect intensity changes in optical power passing through the wavelength tunable filter with a frequency modulation, and to detect an optical power measurement value at a middle point of two points of the intensity changes of the optical power as the optical power of a wavelength to be measured, wherein the detector includes a filter configured to extract the frequency modulation component and an amplitude detector configured to detect the intensity changes based on the frequency modulation component output from the filter. - View Dependent Claims (2, 3, 9, 11)
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4. An optical power control system comprising:
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an optical power monitor configured to detect optical power of respective wavelengths of a signal light; and a controller configured to control the optical power, wherein the power monitor includes; a light emitter configured to superimpose a frequency modulation component onto the signal light; a wavelength tunable filter configured to sweep a pass band of the signal light across a wavelength band for the signal light; and a detector configured to detect intensity changes in optical power passing through the wavelength tunable filter with a frequency modulation, and to detect an optical power measurement value at a middle point of two points of the intensity changes of the optical power as the optical power of a wavelength to be measured, wherein the controller controls the light emitter based on a detected optical power, and wherein the detector includes a filter configured to extract the frequency modulation component and an amplitude detector configured to detect the intensity changes based on the frequency modulation component output from the filter. - View Dependent Claims (5, 6, 7, 10, 12)
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8. An optical power monitor method for detecting optical power of respective wavelengths of a signal light in a wavelength multiplexing system, comprising:
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superimposing a frequency modulation component on the signal light; sweeping a pass band of a wavelength tunable filter across a wavelength-band for the signal light; detecting intensity changes in optical power passing through the wavelength tunable filter with a frequency modulation; extracting the frequency modulation component by a filter; detecting intensity changes based on the frequency modulation component output from the filter; and detecting an optical power measurement value at a middle point of two intensity change points of the optical power along a sweep direction as the optical power of a wavelength to be measured.
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Specification