Reduction of AM-induced penalty in DPSK receivers by sum-squaredemodulation |
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| Authors: | Nielsen TN Gliese U Stubkjaer KE |
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| Affiliation: | Electromagnetics Inst., Tech. Univ. of Denmark, Lyngby; |
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| Abstract: | A DPSK (differential phase shift keying) demodulator which is insensitive to the amplitude modulation induced by semiconductor optical amplifier phase modulators is proposed. The demodulator consists of only two additional power dividers/combiners, compared to a traditional DPSK demodulator. Analysis shows that the receiver penalty caused by amplitude modulation can be reduced from 2-4 dB to zero. The demodulator is demonstrated in a 2.5-Gb/s DPSK system experiment using an optical amplifier as phase modulator |
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