Optical system design for high speed 2km free space optical communication

Changyu Shen; Xiangdong Yu

doi:10.1117/12.745688

19 November 2007 Optical system design for high speed 2km free space optical communication

Changyu Shen, Xiangdong Yu

Proceedings Volume 6783, Optical Transmission, Switching, and Subsystems V; 678348 (2007) https://doi.org/10.1117/12.745688
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

The optical design and experimental results of a free space optical communication system operating at 2Gbps using 1550nm VCSEL were introduced. The optical transmitting system consists of three optical senders and an optical receiver and a photoelectric receiving circuit. An automatic tracking system was employed to eliminate the pointing error between communication terminals. Each optical sender was designed as Schmidt-Cassegrain antenna to collimate the laser beam. λ / 2 plate and polarization beam splitter were used to decrease the interference of astigmatism and reflection. The optical receiver consists of a wave filter, dense-lines Fresnel lens and a photoelectric detector. The system's duplex communication tests showed that the data transmission rate can reach 2Gbps, error rate less than 10^-9, signal-to-noise ratio greater than 8 under the condition of clouds sky (attenuation coefficient is -16 dB/km) as the transmission length is 2000m, data carrier laser of 1550nm. The system had much higher speed rate comparing to other insertion system such as copper wire (1.5Mbps), electric cable (5Mbps), DSL (6Mbps per route).

Citation Download Citation

Changyu Shen and Xiangdong Yu "Optical system design for high speed 2km free space optical communication", Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 678348 (19 November 2007); https://doi.org/10.1117/12.745688

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