Gb/s车地全光通信技术
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摘要
针对现有车地通信技术传输速率低、无线覆盖差和切换困难的缺点,提出了Gb/s车地全光通信技术方案。该方案主要由轨道沿线光纤链路、光分配网和车地无线光通信3个部分组成。光纤链路采用双线光纤热备份技术,交替布置通信区间,实现区间快速无缝切换;光分配网利用列控信息选择光信号的传输支路,实现天线伴随覆盖;车地无线光通信采用自由空间光通信(FSO)技术,大大提高了无线传输速率。仿真结果表明:数据传输速率为2.5Gb/s时,车地全光通信链路接收光功率在10～60μW之间。
With respect to prevalent drawbacks in the current train-to-ground communication technologies, such as low transmission rate, poor wireless coverage and difficult handover, this paper proposes a Gb/s all-optical communication technology for train-to-ground. The solution is mainly composed of three parts: the optical fiber link along the track, the optical delivery network and the train-to-ground wireless optical communication. The optical fiber link adopts the double-line optical fiber warm backup technology, alternately arranges the communication section, realizes the fast and seamlessly handover of section. The optical delivery network uses the train information to select the transmission branch of the signal, and achieves accompanying coverage of antenna. The train-to-ground wireless optical communication adopts free-space optical communication(FSO) technology, which greatly improves the wireless transmission rate. Simulation results show that when the transmission rate is 2.5 Gb/s, and the received power of the all-optical communication link is between 10～60μW.
With respect to prevalent drawbacks in the current train-to-ground communication technologies, such as low transmission rate, poor wireless coverage and difficult handover, this paper proposes a Gb/s all-optical communication technology for train-to-ground. The solution is mainly composed of three parts: the optical fiber link along the track, the optical delivery network and the train-to-ground wireless optical communication. The optical fiber link adopts the double-line optical fiber warm backup technology, alternately arranges the communication section, realizes the fast and seamlessly handover of section. The optical delivery network uses the train information to select the transmission branch of the signal, and achieves accompanying coverage of antenna. The train-to-ground wireless optical communication adopts free-space optical communication(FSO) technology, which greatly improves the wireless transmission rate. Simulation results show that when the transmission rate is 2.5 Gb/s, and the received power of the all-optical communication link is between 10～60μW.
引文
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[2]张友兵,张波,唐涛.列控数据传输与GSM-R越区切换发生碰撞的建模与分析[J].铁道学报,2013,35(5):47-53.
[3]张霞,马连川,曹源,等. CTCS-3级GSM-R车地通信数据丢失概率及其影响的研究[J].通信学报,2014,35(12):203-209.
[4] KIM J H, KIM S H, CHOI K H. A New RBC handover scheme for LTE-R system[J]. Journal of International Council on Electrical Engineering, 2014, 4(3):245-250.
[5] SUBHARTHI B, MICHAEL H, HAMID S. A Survey of Wireless Communication Technologies& Their Performance for High Speed Railways[J]. Journal of Transportation Technologies, 2016, 6(1):15-29.
[6] XU Shizhong, WANG S, LI Lemin. Routing and assignment of wavelength in DWDM opticaltransportnetworks[J]. Journal of China Institute of Communications, 2001, 22(4):51-57.
[7]黄海清,李维民,杨种山,等.下一代ROADM的结构与技术[J].光通信技术,2013,37(5):41-43.
[8]陈勇.全光通信网关键技术的研究与实现[D].北京:北京交通大学,2006.
[9]邱昆.光纤通信导论[M].成都:电子科技大学出版社,1995.
[10]胡淼,刘晨曦,李齐良,等.大功率空间椭圆光束整形和传输研究[J].光子学报,2013,42(10):1163-1168.
[11]王佳.光纤通信与空间光通信技术[M].北京:电子工业出版社,2013.