Wide-Bandwidth Signal Canceller
First Claim
1. A signal canceller comprising:
- a. an optical subtractor having separate first and second electrical inputs, the first electrical input being coupled to a first portion of a first signal and the second electrical input being coupled to a second signal and to a second portion of the first signal; and
b. a laser that is coupled to an optical input of the optical subtractor, the laser generating an optical beam that propagates from the optical input to an optical output of the optical subtractor,the optical subtractor modulating the optical beam with the first and second portions of the first signal and with the second signal, the modulation cancelling at least some the first signal and generating a modulation signal with reduced first signal modulation component.
1 Assignment
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Accused Products
Abstract
A signal canceller includes a dual-drive electro-optic modulator having separate first and second electrical inputs. The first electrical input is coupled to a first portion of a first signal and the second electrical input is coupled to a second signal and to a second portion of the first signal. A laser generates an optical beam that propagates from the optical input to an optical output of the electro-optic modulator. The dual-drive electro-optic modulator modulates the optical beam with the first and second portions of the first signal and with the second signal. The modulation cancels at least some the first signal and generates a modulation signal with reduced first signal modulation component.
24 Citations
28 Claims
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1. A signal canceller comprising:
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a. an optical subtractor having separate first and second electrical inputs, the first electrical input being coupled to a first portion of a first signal and the second electrical input being coupled to a second signal and to a second portion of the first signal; and b. a laser that is coupled to an optical input of the optical subtractor, the laser generating an optical beam that propagates from the optical input to an optical output of the optical subtractor, the optical subtractor modulating the optical beam with the first and second portions of the first signal and with the second signal, the modulation cancelling at least some the first signal and generating a modulation signal with reduced first signal modulation component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A signal canceller comprising:
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a. a Mach-Zehnder interferometric modulator comprising a first electrode electromagnetically coupled to a first arm of the Mach-Zehnder interferometric modulator and having an input coupled to a first portion of a first signal and a second electrode electromagnetically coupled to a second arm of the Mach-Zehnder interferometric modulator and having an input coupled to a second signal and to a second portion of the first signal; and b. a laser that is coupled to an optical input of the Mach-Zehnder interferometric modulator, the laser generating an optical beam that propagates from the optical input to an optical output of the Mach-Zehnder interferometric modulator, the Mach-Zehnder interferometric modulator modulating the optical beam with the first and second portions of the first signal and with the second signal, the modulation cancelling at least some the first signal, thereby generating a modulation signal with reduced first signal modulation component. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A signal canceller comprising:
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a. a dual-drive electro-optic modulator having a first electrical input being coupled to a first portion of a first signal and a second electrical input being coupled to a second signal and to a second portion of the first signal; b. a laser that is coupled to an optical input of the dual-drive electro-optic modulator, the laser generating an optical beam that propagates from the optical input to an optical output of the electro-optic modulator; and c. a signal processor having a first input that is electromagnetically coupled to the optical output of the electro-optic modulator, a second input that receives a portion of the first signal, and an output that is coupled to the first electrical input, the signal processor generating the first portion of the first signal, the dual-drive electro-optic modulator modulating the optical beam with the first and second portions of the first signal and with the second signal, the modulation at least partially cancelling the first and second portions of the first electrical signal, thereby generating a modulation signal with reduced first signal modulation. - View Dependent Claims (18, 19)
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20. A method of cancelling a signal, the method comprising:
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a. coupling a first portion of a first electrical signal into a first electrical input of a dual-drive electro-optic modulator; b. coupling a second portion of a first electrical signal and a second electrical signal into a second electrical input of the dual-drive electro-optic modulator; c. generating an optical beam that propagates from the optical input to an optical output of the electro-optic modulator; and d. modulating the optical beam with the first and second portions of the first signal and with the second signal, the modulation at least partially cancelling the first and second portions of the first electrical signal, thereby generating a modulation signal with reduced first signal modulation. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification