Measuring system of transmission characteristics
First Claim
1. A measuring system of transmission characteristics, comprising:
- a reference signal light generator to generate reference signal light having a reference wavelength optically intensity-modulated at a reference frequency;
a measuring signal light generator to generate measuring signal light having a measuring wavelength optically intensity-modulated at a measuring frequency and synchronized with the reference frequency;
a multiplexer to multiplex the reference signal light and the measuring signal light and to output the multiplexed lights onto an optical line;
a photodetector to convert the multiplexed lights propagating on the optical line into electric signals;
a reference frequency extractor to extract the reference frequency from the electric signals output from the photodetector; and
a phase detector to detect a phase of the measuring frequency contained in the electric signals output from the photodetector according to the extracted reference frequency.
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Accused Products
Abstract
A measuring system of transmission characteristics comprises a reference signal light generator for generating reference signal light of a reference wavelength optically intensity-modulated at a reference frequency, a measuring signal light generator for generating measuring signal light of a measuring wavelength optically intensity-modulated at a measuring frequency synchronizing with the reference frequency, a multiplexer for multiplexing the reference signal light and measuring signal light respectively generated by the reference signal light generator and measuring signal light generator and outputting them onto a to-be-measured optical line, a photodetector for converting the lights propagated on the to-be-measured line into electric signals, a reference frequency extractor for extracting the component of the reference frequency from the output of the photodetector, and a phase detector for detecting a phase of a frequency component corresponding to the measuring frequency contained in the output of the photodetector according to the output of the reference frequency extractor.
33 Citations
13 Claims
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1. A measuring system of transmission characteristics, comprising:
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a reference signal light generator to generate reference signal light having a reference wavelength optically intensity-modulated at a reference frequency;
a measuring signal light generator to generate measuring signal light having a measuring wavelength optically intensity-modulated at a measuring frequency and synchronized with the reference frequency;
a multiplexer to multiplex the reference signal light and the measuring signal light and to output the multiplexed lights onto an optical line;
a photodetector to convert the multiplexed lights propagating on the optical line into electric signals;
a reference frequency extractor to extract the reference frequency from the electric signals output from the photodetector; and
a phase detector to detect a phase of the measuring frequency contained in the electric signals output from the photodetector according to the extracted reference frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A measuring system of transmission characteristics, comprising:
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an oscillator having an output with a measuring frequency;
a first signal light generator to generate a first signal light having a first wavelength optically intensity-modulated at the measuring frequency and to output it onto a first optical line;
a first photodetector to receive the first signal light propagated on the first optical line and to output a signal at a frequency corresponding to the measuring frequency;
a second signal light generator to generate a second signal light having a second wavelength optically intensity-modulated with the signal from the photodetector and to output it onto a second optical line;
a second photodetector for receiving the second signal light propagated on the second optical line; and
a phase detector to detect a phase of the measuring frequency component contained in an output of the second photodetector according to the output of the oscillator. - View Dependent Claims (10, 11, 12, 13)
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Specification