Frequency division multiple access network

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	Frequency division multiple access network
其他题名	Frequency division multiple access network
	KAMINOW, IVAN P.
	1995-05-31
专利权人	AT&T CORP.
公开日期	1995-05-31
授权国家	欧洲专利局
专利类型	授权发明
摘要	An NxN passive star coupler (10) can be used to provide a high performance optical data network to interconnect many users at gigabit rates. Ignoring excessive losses, a signal incident on any input port (14,16,...N) is divided equally between all of the output ports (15,17,...N). The average power at all of the input ports N of the star is equal to the average power at all of the output ports N. But, the power per channel at each output port is equal to only 1/N of the applied power. This loss which is due to splitting cannot be recovered by an amplifier at either the input port or the output port of the star coupler unless the amplifier saturation power is greater than the transmitter power. This invention solves the problem of amplifier saturation. Briefly, a discrete optical frequency signal which, when combined in the star coupler produces identical frequency division multiplex spectra at each output port is applied to each input port of the passive star coupler and tunable fiber Fabry-Perot filters (in 13,25) are coupled to the output ports of the star coupler. The optical filters select the various channels. An amplifier (in 13,25) is positioned downstream of each optical filter. By placing the amplifiers after the optical filter, the power level applied to the amplifier is substantially 1/(2 N) of the transmitter power and saturation of the amplifier is minimized as a constraint.
其他摘要	NxN无源星形耦合器（10）可用于提供高性能光学数据网络，以便以千兆位速率互连许多用户。忽略过多的损耗，入射在任何输入端口（14,16，...... N）上的信号在所有输出端口（15,17，... N）之间平均分配。星形的所有输入端口N处的平均功率等于所有输出端口N处的平均功率。但是，每个输出端口处的每个通道的功率仅等于所施加功率的1 / N.除非放大器饱和功率大于发射机功率，否则放大器在星形耦合器的输入端口或输出端口处无法恢复由于分裂引起的损耗。本发明解决了放大器饱和的问题。简而言之，一个离散的光频信号，当在星形耦合器中组合时，在每个输出端口产生相同的频分复用频谱，被应用于无源星形耦合器的每个输入端口，可调光纤法布里 - 珀罗滤波器（13,25）是耦合到星形耦合器的输出端口。滤光器选择各种通道。放大器（在13,25中）位于每个滤光器的下游。通过将放大器放置在滤光器之后，施加到放大器的功率电平基本上是发射器功率的1 /（2N），并且放大器的饱和度被最小化作为约束。
申请日期	1990-11-23
专利号	EP0434236B1
专利状态	失效
申请号	EP1990312788
公开（公告）号	EP0434236B1
IPC 分类号	H04B10/02 \| H01S5/00 \| H04J14/02 \| H04B10/14
专利代理人	-
代理机构	BUCKLEY, CHRISTOPHER SIMON THIRSK
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/34928
专题	半导体激光器专利数据库
作者单位	AT&T CORP.
推荐引用方式 GB/T 7714	KAMINOW, IVAN P.. Frequency division multiple access network. EP0434236B1[P]. 1995-05-31.