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Optimum Design for RF-to-Optical Up-Converter in Coherent Optical OFDM Systems

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4 Author(s)
Yan Tang ; Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Vic. ; Shieh, William ; Xingwen Yi ; Evans, R.

In this letter, we conduct analysis on the optimum design for RF-to-optical up-converter in coherent optical OFDM systems using an optical I/Q modulator. We first derive closed-form expressions for the nonlinearity in the optical I/Q modulator, represented by two-tone intermodulation products as a function of the bias point and modulation index. Additionally, we perform a numerical simulation to identify Q-penalty and the excess modulation insertion loss under various transmitter conditions. We find that in contrast to the direct-detected system, the optimal modulator bias point for the coherent system is pi, where the Q-penalty and excess loss are minimized

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 7 )