Phase shift keying using optical delay modulation formillimeter-wave fiber-optic radio links |
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Authors: | Doi Y. Fukushima S. Ohno T. Matsuoka Y. Takeuchi H. |
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Affiliation: | NTT Photonics Labs., Kanagawa; |
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Abstract: | We propose a novel phase shift keying technique that uses optical delay modulation for fiber optic radio links. Using only a 2×1 switch and a delay line, this technique enables modulation of a millimeter-wave carrier at bit rates of several gigabits per second or higher, where high-speed devices are not needed. Binary phase shift keying (BPSK) was experimentally demonstrated, 2-Gb/s data signal on a 40-GHz carrier was transmitted over a 5-km optical fiber without any error. The coherent crosstalk noise, due to insufficient extinction ratio of optical switches, was evaluated. The BPSK modulation technique can he extended to multiphase shift-keying modulation |
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