Y. Dong and R.S. Wolff (USA)
—Transceivers, Passive optical network (PON), optical phase modulation, optical phase modulator 1.
—This paper presents a novel optical communication technique that provides a second, low data channel on an existing high-speed fiber optic link. The second channel is derived using an acousto optic fiber phase modulator and interferometric receiver. This method modulates the optical phase of the original high speed optical signal with a low frequency sine wave. At the receiving end of the low-speed path, an interferometer and band pass filter are used to recover the low-speed signal. Information is carried on the low frequency sine wave by use of FSK modulation. The method is non-invasive in that the low-speed channel is derived without electrically, optically or physically affecting the performance of high-speed optical path. The method is ideal for overlaying network management channels on a fiber network.
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