Radio-over-Fiber Transmission of 1.25-Gigabit Ethernet Signal on 60-GHz Band Subcarrier with Performance Improvement and Wavelength Reuse

With radio-over-fiber (RoF) enabled remote antenna, gigabit Ethernet service operating at 60-GHz frequencies can be accessed cordlessly. Due to limited linear operation region of 60-GHz optoelectronic modulators commercially available so far, optical weak modulation is required leading to limited link performance. This paper demonstrates in RoF transmission of 1.25-Gigabit Ethernet signal on 60-GHz band subcarrier, the fiber downlink performance is improved by suppressing the optical carrier-to-sideband ratio based on the usage of a simple and low-cost fabricated 2 times 2 all-fiber optical interleaver. Simultaneously by using the interleaver, the downlink optical carrier is recovered and is reused as optical source for fiber uplink hence laser-free access point is achieved.