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Application of Brillouin amplification in coherent optical transmission

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Optical homodyne detection offers the optimum receiver sensitivity and is more efficient in its use of receiver bandwidth than heterodyne detection. However, to date, optical phase locking the local oscillator laser in a homodyne receiver has proved a formidable problem both in terms of complexity and stringent (>100-kHz) laser linewidth requirements. This paper describes a novel technique that should enable homodyne performance to be achieved without these difficulties. The principle is based on selective amplification of the carrier component of the received optical signal prior to photodetection.1

© 1986 Optical Society of America

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