Performance improvement and wavelength reuse in millimeter-wave radio-over-fiber links incorporating all-fiber optical interleaver |
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Authors: | Ming-Tuo Zhou QJ Wang YX Guo Yan Zhang YC Soh |
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Institution: | a Wireless Communications Laboratory, National Institute of Information and Communications Technology, 20 Science Park Road, #01-09A/10 Teletech Park, Singapore 117674, Singapore b School of EEE, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore c Institute for Infocomm Research, 20 Science Park Road, #02-21/25 TeleTech Park, Singapore 117674, Singapore d Singapore Institute of Manufacturing Technology, Singapore 638075, Singapore e Simula Research Laboratory, Martin Linges v 17, Fornebu, P.O.Box 134, 1325 Lysaker, Norway |
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Abstract: | Simultaneous downlink performance improvement and uplink wavelength reuse in a full-duplex millimeter-wave (MMW) radio-over-fiber (RoF) system by using a simple and cost-effective all-fiber optical interleaver are proposed and demonstrated. The MMW RoF downlink performance improvement is based on suppressing optical carrier-to-sideband ratio (OCSR), with which the mechanism is confirmed by theoretic analysis and derived experimental results. Measured results show that, by suppressing OCSR using a fabricated all-fiber optical interleaver, the downlink optical receiver sensitivity is improved about 2.1 dB. The downlink data rate is 1.25 Gbit/s and the carrier frequency is 58.1 GHz; the link consists of 6 km optical single-mode fiber and 1 m wireless connection. On the other hand, with the interleaver suppressing downlink OCSR, simultaneously an optical carrier is recovered from the RoF downlink and is reused for RoF uplink transmission. The uplink is operated at 62.9 GHz and the data rate is the same 1.25 Gbit/s. With the recovered optical carrier, a laser-free remote access point is achieved. The principle, structure, and fabrication of an all-fiber optical interleaver are also presented in this paper. |
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Keywords: | Optical communications Analogue optical fiber systems All-fiber optical interleaver Optical carrier-to-sideband ratio Optical wavelength reuse Radio-over-fiber |
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