Subcarrier-multiplexed optical transmission systems using...

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H - Electricity

04

J

363/1.8

H04J 14/02 (2006.01)

Patent

CA 1330242

SUBCARRIER-MULTIPLEXED OPTICAL TRANSMISSION SYSTEMS USING OPTICAL CHANNEL SELECTION Abstract An optical amplifier is used as a frequency-selec- tive high-gain element in a subcarrier-multiplexed fiber optic transmission system. A high-speed diode laser optical transmitter is modulated by a plurality of independent information channels that are carried on separate, appropriately spaced carrier frequencies. An optical receiver, coupled to the transmitter by way of an optical fiber, includes a narrow-bandpass semiconductor laser optical amplifier having a gain bandwidth smaller than wavelength distances between adjacent ones of the carrier frequencies, a photodetector coupled to the output of the amplifier, and polarization controlling means coupled to the fiber in front of the optical amplifier for maximizing gain in the optical amplifier.

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