Tesla, Vol 7, No 1 (2005)

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TEKNIK MODULASI DAN DEMODULASI PSK DALAM KOMUNIKASI LIGHTWAVE KOHERN

Tjandra Susila

Abstract


Among the various modulation and demodulation schemes, Phase Shift Keying (PSK), is the most attractive for long distance transmission owing to the best receiver sensitivity. The optical PSK generation using electro-optic effect as an external modulator, has been demonstrated by the author. In this paper, we discuss various types of phase modulator and heterodyne detection schemes of PSK. However homodyne detection can also be used but due to strict linewidth requirement of the laser diode makes it prohibitive to implement.


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