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在过去的20年里,以光纤为基础的光通信技术已广泛用于长途干线(海底及陆地通信系统)及局间光纤传输系统,极大地促进了通信网的发展,改善了通信质量。随着信息高速公路的发展,作为信息高速公路骨干传输网的光通信系统将向高速率、大容量发展,以提供高速或彩色传真、VOD、可视电话等多媒体宽带业务,满足人们日益增长的宽带业务需求。为此,世界各国纷纷进行SDH的建设、规划,积极研制开发新的光通信技术,如光放大器、波分复用(WDM)设备及其它高速光电子设备。
In the past two decades, optical fiber-based optical communication technologies have been widely used in long-haul trunk (subsea and terrestrial communication systems) and interoffice optical fiber transmission systems, greatly promoting the development of communication networks and improving communication quality. With the development of the information superhighway, the optical communication system, which is the key transmission network of the information superhighway, will develop at a high rate and large capacity to provide multimedia broadband services such as high speed or color fax, VOD, video telephony and the like to meet the growing demand of people Broadband business needs. To this end, all countries in the world have been building SDH, planning and actively developing new optical communication technologies such as optical amplifiers, wavelength division multiplexing (WDM) devices and other high-speed optoelectronic devices.