Optical add-drop multiplexer
First Claim
1. An optical add-drop multiplexer comprising:
- an optical splitter configured to split input light that includes a multicarrier signal into which a plurality of optical signals are multiplexed and first continuous-wave light of a first optical frequency so as to generate first input light and second input light;
a receiver configured to generate an electric signal indicating the multicarrier signal from the second input light, and to extract a dropped signal indicating a specified dropped optical signal from among the plurality of optical signals multiplexed into the multicarrier signal by using the electric signal;
an inverted signal generator configured to generate an inverted signal of the dropped signal;
a transmitter configured to generate a modulated optical signal based on the inverted signal;
a light source circuit configured to generate second continuous-wave light of a second optical frequency and third continuous-wave light of a third optical frequency, a phase of the third continuous-wave light being synchronized with a phase of the second continuous-wave light;
a delay element configured to adjust a phase difference between the modulated optical signal and the third continuous-wave light;
a nonlinear optical medium into which the first input light, the modulated optical signal, and the second continuous-wave light are input;
a detector configured to detect a beat frequency component between the modulated optical signal and the third continuous-wave light; and
a controller configured to control the delay element so as to increase the beat frequency component, whereina difference between the first optical frequency and an optical frequency of the dropped optical signal is substantially the same as a difference between the second optical frequency and an optical frequency of the modulated optical signal.
1 Assignment
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Accused Products
Abstract
Input light includes a multicarrier signal and first CW light of a first optical frequency. A transmitter generates a modulated optical signal based on an inverted signal of a dropped signal. A light source generates second CW light of a second optical frequency. A delay element adjusts a phase difference between the modulated optical signal and the second CW light. The multicarrier signal, the first CW light, the modulated optical signal and the second CW light are input to nonlinear optical medium. A detector detects beat frequency component between the modulated optical signal and the second CW light. A controller controls the delay element so as to increase the beat frequency component. A difference between the first optical frequency and an optical frequency of the dropped optical signal is substantially the same as a difference between the second optical frequency and an optical frequency of the modulated optical signal.
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Citations
9 Claims
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1. An optical add-drop multiplexer comprising:
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an optical splitter configured to split input light that includes a multicarrier signal into which a plurality of optical signals are multiplexed and first continuous-wave light of a first optical frequency so as to generate first input light and second input light; a receiver configured to generate an electric signal indicating the multicarrier signal from the second input light, and to extract a dropped signal indicating a specified dropped optical signal from among the plurality of optical signals multiplexed into the multicarrier signal by using the electric signal; an inverted signal generator configured to generate an inverted signal of the dropped signal; a transmitter configured to generate a modulated optical signal based on the inverted signal; a light source circuit configured to generate second continuous-wave light of a second optical frequency and third continuous-wave light of a third optical frequency, a phase of the third continuous-wave light being synchronized with a phase of the second continuous-wave light; a delay element configured to adjust a phase difference between the modulated optical signal and the third continuous-wave light; a nonlinear optical medium into which the first input light, the modulated optical signal, and the second continuous-wave light are input; a detector configured to detect a beat frequency component between the modulated optical signal and the third continuous-wave light; and a controller configured to control the delay element so as to increase the beat frequency component, wherein a difference between the first optical frequency and an optical frequency of the dropped optical signal is substantially the same as a difference between the second optical frequency and an optical frequency of the modulated optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical add-drop multiplexer comprising:
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an optical splitter configured to split input light that includes a multicarrier signal into which a plurality of optical signals are multiplexed and first continuous-wave light of a first optical frequency so as to generate first input light and second input light; a receiver configured to generate an electric signal indicating the multicarrier signal from the second input light, and to extract a dropped signal indicating a specified dropped optical signal from among the plurality of optical signals multiplexed into the multicarrier signal by using the electric signal; an inverted signal generator configured to generate an inverted signal of the dropped signal; a transmitter configured to generate a modulated optical signal based on the inverted signal; a light source circuit configured to generate second continuous-wave light of a second optical frequency; a delay element configured to adjust a phase difference between the modulated optical signal and the second continuous-wave light; a nonlinear optical medium into which the first input light, the modulated optical signal, and the second continuous-wave light are input; a detector configured to detect a beat frequency component between the modulated optical signal and the second continuous-wave light; and a controller configured to control the delay element so as to increase the beat frequency component, wherein a difference between the first optical frequency and an optical frequency of the dropped optical signal is substantially the same as a difference between the second optical frequency and an optical frequency of the modulated optical signal. - View Dependent Claims (9)
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Specification