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Impact of local oscillator intensity noise on performance of coherent subcarrier multiplexing system using common local oscillator (CLO)

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2 Author(s)
Lee, Y.H. ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Tsao, H.W.

The impact of local oscillator intensity noise on the performance of a coherent subcarrier multiplexing (CSCM) system using a common local oscillator (CLO) is analysed. For a given LO power, RIN noise, and thermal noise, the CNR can be expressed in terms of x, the ratio of sigma sh2+ sigma th2 over sigma RIN2 and, for x<<1, the CNR decreases as LO power increases; for x>>1, the CNR increases as the LO power increases; as x approaches 1, there exist an optimum value of local oscillator power and a corresponding maximum CNR. For a system with RIN=-150 dB/Hz, PS=-20 dBm, beta =0.02, N=40, NF=3 dB and B=10 MHz, the (PLO)opt is found to be -4 dBm and (CNR)max 22.5 dB.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 23 )