面向卫星互联网的星载光交换技术

doi:10.11959/j.issn.2096-8930.2022020

Abstract

Abstract:

With the increasing demands for ultra-high speed and large-capacity information transmission such as satellite remote sensing, big data super computing center, video battlefield and 6G mobile communication.The satellite laser communication technology using laser instead of traditional microwave as information carrier has become development trend.It is an eff ective mean to solve the bottleneck of microwave communication bandwidth and reduce the shortage of spectrum resources.In the future, we need to build a satellite internet with global coverage, which are needed to provide the capabilities that terrestrial optical fi ber networks do not have (large coverage, low-delay, services in sparsely populated areas, no geographical obstacles, etc.).The spaceborne optical switching technology is the key and core for the ultra-high speed and large capacity information processing on satellite nodes.Firstly, the development context of satellite internet based on laser communication was introduced, the importance of spaceborne optical switching technology for satellite internet was analyzed.It focused on the detailed classifi cation and comparison, system and information processing mode of space-borne optical switching technology, and showed the potential technical scheme in the future.Then, the characteristics and application schemes of optical switching core devices were analyzed and studied to provided reference for the next generation of satellite internet technology research.

Key words: satellite internet, space optical network, core photoelectric devices

CLC Number:

TP929.1

Jiacheng MENG, Ningbo XIE, Zhaofeng BAI, Jiaxuan ZHU, Junxia WU, Duorui GAO, Wei WANG, Xiaoping XIE. Spaceborne Optical Switching Technology for Satellite Internet[J]. Space-Integrated-Ground Information Networks, 2022, 3(2): 47-55.

Figures/Tables 9

References 51

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交换方式	优势	劣势
电交换	以电子数字信号处理技术为基础的交换方式，交换数据粒度可以非常小，直接提供用户使用	交换容量要受到电子元器件工作速度的限制，功耗大，系统串扰严重
光交换	拥有极宽的带宽，是电交换的几百倍，运行速度快，模拟信号与数字信号传输均可进行光交换；光交换的体积、功耗要远小于电交换	光缓存技术不成熟，无法进行光域存储转发交换

参数	光电路交换	光突发交换	光分组交换
交换颗粒度	最大（链路、信道）	大（突发包）	小（分组包）
交换时间	ms量级	ms量级	μs量级
连接需求	面向连接	面向连接	面向非连接
资源预约	资源预留机制；含光路建立、保持和释放	需要预约端口、波长等资源	无须预约
临时接入灵活性	不灵活	不灵活	灵活
链路资源利用率	极低，带宽资源浪费严重	低	高
核心要求	先建立链路再传输	信令网	光缓存

性能	种类
性能	MEMS	LCOS	PLC
拓展性	高	低	中
体积	小	中	中
插损	中	中	小
回损	优	差	良
串扰	优	差	差
开关速度	慢	慢	快
功耗	中	小	小

Spaceborne Optical Switching Technology for Satellite Internet

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