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20世纪80年代之前,在业界是不知道光放大器的。光纤通信在进行长距离传输时,人们采用了每隔一定距离就设置中继器的做法来满足当时的通信需要。这时的中继器是光—电—光的中继器,其工作原理是先将接收到的微弱光信号经光电检测器转换成电信号,然后对此电信号进行放大、均衡、判决等,使信号再生,最后再通过半导体激光器完成电—光转换,重新发送到下一段光纤中去。在光纤通信系统传输距离和速率不断提高的现代通信中,这种光—电—光的中继变换处理方式的成本迅速增加,已经不能满足现代通信传输的要求。对电信运营商特别是对光设备制造商来说更是不能接受的——无论是技术还是价格在项目招标中都毫无竞争力。
Before the 1980s, optical amplifiers were not known in the industry. Optical fiber communication in the long-distance transmission, people used to set the repeater at regular intervals to meet the current needs of the communications. In this case, the repeater is a light-electricity-light repeater. The working principle of the repeater is that the weak light signal received is first converted into an electrical signal by a photodetector, and then the electrical signal is amplified, balanced and judged , So that the signal regeneration, and finally through the semiconductor laser to complete the electrical - optical conversion, re-sent to the next paragraph of fiber to go. In the modern communication where the transmission distance and the rate of the optical fiber communication system are continuously increasing, the cost of the optical-electric-optical relay transformation processing method rapidly increases and can no longer meet the requirements of modern communication transmission. It is even more unacceptable for telecom operators, especially for optical equipment manufacturers - neither technology nor price are competitive in bidding.