Reduction of optical beat interference using gain-saturated RSOA in upstream WDM/SCM optical links |
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| Authors: | Y-Y Won H-C Kwon S-K Han |
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| Affiliation: | Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul; |
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| Abstract: | A new scheme for reducing optical beat interference (OBI) noise in optical network units is proposed for subcarrier multiplexing-based access network applications. The optical spectrum of the transmit lasers is broadened by using a radio frequency (RF) clipping tone with a modulation depth greater than one. This reduces the impact of the OBI noise. The distortions caused by an RF clipping tone are also suppressed by introducing a gain-saturated reflective optical amplifier, which shows the characteristics of high-pass filter. The proposed scheme has been verified by measuring the error vector magnitude of 16QAM signal with 20 Mbps. Error-free transmission has been achieved even when the light of OBI-noise-causing lasers is stronger than that of the signal laser by 7 dB |
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