Reduction of frequency fading and imperfect frequency response with pre-emphasis technique in OFDM-ROF systems |
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Authors: | Fan Li |
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Institution: | Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education School of Information Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract: | In this paper, a novel technique is proposed and experimentally demonstrated to reduce the effect of frequency fading (FF) and imperfect frequency response in direct-detection (DD) optical orthogonal frequency division multiplexing-radio-over-fiber (OFD-MROF) systems. To overcome FF effect in the optical fiber and imperfect frequency response in the optical and electrical devices at the high frequency, we pre-emphasize the power of the millimeter wave (mm-wave) OFDM sub-carriers appropriately in the center station. Experimental result of the proposed system shows the received sensitivity has been improved about 2 dB at the BER of 1 × 10− 4 after 50 km SSMF transmission for 2.5 Gb/s OFDM signal carried on 60 GHz optical mm-wave compared to the original system without pre-emphasis technique. |
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Keywords: | OFDM-ROF Direct-detection (DD) Imperfect frequency response Frequency fading (FF) Pre-emphasis |
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