Chinese Optics Letters, Volume. 2, Issue 3, 03128(2004)
A novel modulation and direct detection scheme of optical phase shift keying
This paper introduces a new modulation and direct detection scheme of optical phase shift keying (PSK) which is simple and practical in fiber optical communication. A phase modulator is used to modulate a continuous wave (CW) laser source and return-to-zero (RZ) signal that is changed from the initial transmitting information is used to control a phase modulator to form a optical PSK signal. In the receiver terminal, just add a signal delayed a half of one bit to itself so that the initial information can be restored.
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Yongcai Yang, Wolfgang Vogel. A novel modulation and direct detection scheme of optical phase shift keying[J]. Chinese Optics Letters, 2004, 2(3): 03128