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在过去10年间,光纤电信技术得到了迅速发展,并成为现在电信领域中应用的一种主要方法。光波导的应用已从大容量长距离干线业务扩大到直接连结用户的远距离地方网络。10年前,光纤传输依靠多模光波导和短波长光学装置,主要用于短距离业务区域。为了提高传输容量和系统的机动性,改善成本因素,扩大光纤电信业务的机会,近来研究了单模光波导、长波长光学装置和其他各种有关技术。1981年,32兆比/秒(10~6比/秒)和100兆比/秒光纤数据传输系统已进入日本商务。1983年,采用了400兆比/秒传输系统,1987年,16亿比/秒容量传输系统开始了商业运转。这些系统都是以应用发光强度调制和直接检波的非相干光波传输技术为基础。为了达到较高的容量和较长的中继间隔,研究与发展工作对这些系统进行了不断改进。
Over the past decade, fiber optic telecommunications technology has been rapidly evolving and has become a major method used today in telecommunications. The application of optical waveguides has expanded from large-capacity long-haul trunk lines to long-distance local networks that directly connect users. Ten years ago, fiber optic transmission relied on multi-mode optical waveguides and short-wavelength optical devices, mainly for short-range service areas. In order to improve the transmission capacity and system mobility, improve the cost factor and expand the optical telecommunication business opportunities, recent studies on single-mode optical waveguides, long-wavelength optical devices and other various related technologies have been conducted. In 1981, 32 megabits per second (10 to 6 beats / second) and 100 Mbit / s optical fiber data transmission systems were introduced into Japanese business. In 1983, a 400 megabits per second transmission system was adopted. In 1987, a 1.6 billion / sec capacity transmission system began commercial operation. These systems are based on incoherent optical transmission using intensity modulation and direct detection. In order to achieve higher capacity and longer relay intervals, research and development efforts have continuously improved these systems.