ALL-OPTICAL FREQUENCY UPCONVERTER AND ALL-OPTICAL FREQUENCY UPCONVERSION METHOD IN RADIO-OVER-FIBER SYSTEM
First Claim
1. An all-optical frequency upconversion method in a radio-over-fiber system, which uses a semiconductor optical amplifier and an optical filter, the all-optical frequency upconversion method comprising:
- mixing an optical intermediate frequency signal with an optical local oscillation signal utilizing four wave mixing effect in a semiconductor optical amplifier; and
filtering optical radio frequency (RF) signals from number of frequency component signals generated through the four wave mixing in a semiconductor optical amplifier by using an optical filter.
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Abstract
Disclosed is an all-optical frequency upconverter in a radio-over-fiber system that outputs upconverted optical radio frequency (RF) signals using an optical intermediate frequency signal and an optical local oscillation signal. The all-optical frequency upconverter includes a semiconductor optical amplifier that mixes the optical intermediate frequency signal with the optical local oscillation signal through four wave mixing, and an optical filter that filters a plurality of frequency component signals, which are generated through the four wave mixing, to extract optical RF signals. According to the invention the system configuration can be made simple, and wide LO and IF frequency bandwidths can be provided.
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Citations
13 Claims
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1. An all-optical frequency upconversion method in a radio-over-fiber system, which uses a semiconductor optical amplifier and an optical filter, the all-optical frequency upconversion method comprising:
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mixing an optical intermediate frequency signal with an optical local oscillation signal utilizing four wave mixing effect in a semiconductor optical amplifier; and filtering optical radio frequency (RF) signals from number of frequency component signals generated through the four wave mixing in a semiconductor optical amplifier by using an optical filter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An all-optical frequency upconversion method in an all-optical frequency upconverter of a radio-over-fiber system, the all-optical frequency upconversion method comprising:
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mixing an optical intermediate frequency signal with an optical local oscillation signal through four wave mixing; and filtering optical RF signals from number of frequency component signals generated through the four wave mixing. - View Dependent Claims (8, 9)
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10. An all-optical frequency upconverter in a radio-over-fiber system that outputs upconverted optical RF signals through mixing an optical intermediate frequency signal and an optical local oscillation signal, the all-optical frequency upconverter comprising:
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a semiconductor optical amplifier that mixes the optical intermediate frequency signal with the optical local oscillation signal through four wave mixing; and an optical filter that filters optical RF signals from number of frequency component signals generated through the four wave mixing. - View Dependent Claims (11, 12, 13)
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Specification