专利名称：Optical branching device and method of
optical transmission
发明人：Kaneko, Tomoyuki,Watanabe, Seiji申请号：EP98301462.2申请日：19980227公开号：EP0862071B1公开日：20030806
摘要：In an optical transmission system, an optical branching device (3a, 3b, 3c) is inuse, the number of original transmission lights decreases or level of transmission lightsdeteriorates for some cause or other. Since output of optical amplifier (4) ispredetermined, when the number of transmission lights reduces, level of remainingtransmission light is changed, thus departing from optimum operation condition. There isprovided an optical branching device (3a, 3b, 3c) comprising two optical circulators (1,2)and a plurality of fiber gratings (8,9) which are arranged in series. The gratings arelocated between the two optical circulators. Each grating reflects light with a wave lengthdifferent from transmission light, at the time of malfunction such as disconnection, itcauses a light with a wave length different from the transmission light to transmit fromterminal station (5, 6) or branching station (7a, 7b), thus maintaining the level of thetransmission light to prescribed level. When the level of the transmission lights
deteriorates, it causes the level of transmission light from the branching station (7a, 7b)to be adjusted. As a result, the level of respective transmission lights is maintained to theoriginal level so that optimum operation condition is maintained, thus the level amongthe respective transmission lights is capable of being adjusted.
申请人：NEC CORP
地址：JP
国籍：JP
代理机构：Moir, Michael Christopher
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