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1. 发明授权

US06341021B1 Dynamic power equalization of many wavelength-division-multiplexed channels in a fiber-optic system 失效
标题翻译：光纤系统中许多波分复用通道的动态功率均衡
公开(公告)号：US06341021B1
公开(公告)日：2002-01-22
申请号：US09023741
申请日：1998-02-13
申请人： Alan E. Wilner , David A. Smith , Jin-Xin Cai , Kai-Ming Feng , Xingyu Zou , Shouhua Huang
发明人： Alan E. Wilner , David A. Smith , Jin-Xin Cai , Kai-Ming Feng , Xingyu Zou , Shouhua Huang
IPC分类号： H04J1402
CPC分类号： H04B10/2507 , H04J14/0221
摘要： A dynamic power equalization module (10) for an optical network is provided. It includes a module input (16) for receiving an optical transmission (14) containing a combination of different channels (C1-Cn). Each channel (C1-Cn) has a different characteristic wavelength (&lgr;1-&lgr;n) and different varying power. A power equalization device that is polarization insensitive is connected between the module input (16) and a module output (20). The power equalization device is driven by RF acoustic signals (26). A feedback loop (22) receives at least a portion of output from the module output (20) and generates, based upon a comparison of relative powers of the different channels (C1-Cn), the RF acoustic signals (26) which drive the power equalization device. The power equalization device is driven such that it dynamically controls transmission of the different channels (C1-Cn) to substantially equalize power differentials therebetween. The power equalization device includes a parallel array of acousto-optic modulators (AO1-AOn).
摘要翻译：提供了一种用于光网络的动态功率均衡模块（10）。它包括用于接收包含不同信道（C1-Cn）的组合的光传输（14）的模块输入（16）。每个通道（C1-Cn）具有不同的特征波长（lambd1-lambdn）和不同的变化功率。在模块输入（16）和模块输出（20）之间连接有极化不敏感的功率均衡器件。功率均衡装置由RF声信号（26）驱动。反馈回路（22）接收来自模块输出（20）的输出的至少一部分，并且基于不同通道（C1-Cn）的相对功率的比较产生驱动功率均衡器。功率均衡装置被驱动，使得其动态地控制不同通道（C1-Cn）的传输，以使它们之间的功率差基本相等。功率均衡装置包括声光调制器（AO1-AOn）的并联阵列。

2. 发明授权

US5940196A Optical communications system with wavelength division multiplexing 失效
标题翻译：具有波分复用的光通信系统
公开(公告)号：US5940196A
公开(公告)日：1999-08-17
申请号：US858067
申请日：1997-05-16
申请人： David Piehler , Xingyu Zou , Alan C. Nilsson , Chien-Yu Kuo
发明人： David Piehler , Xingyu Zou , Alan C. Nilsson , Chien-Yu Kuo
IPC分类号： H04J14/02
CPC分类号： H04J14/02 , H04B10/50 , H04J14/0298
摘要： A wavelength division multiplexer (WDM) in an optical fiber transmission system launches analog signals, for instance a multi-channel television signal. The WDM enhances signal quality by transmitting along a single fiber two different optical wavelength signals, each carrying identical RF information. This results in a 3 dB improvement in carrier to noise ratio. The WDM combines two or more wavelengths centered around for instance 1550 nm or 1310 nm. A typical difference between the two wavelengths is 3 nm. In other embodiments, more than two wavelengths are used. The receiver is for instance a single photosensitive element. The phase of the two RF signals is adjusted in the optical or RF domain to be the same upon arrival at the receiver. In other embodiments, the receiver includes two photosensitive elements, each receiving from a receiver end WDM a single wavelength. In this case, the phase adjustment may be applied at the receiver in the optical or RF domain.
摘要翻译：光纤传输系统中的波分多路复用器（WDM）发射模拟信号，例如多声道电视信号。 WDM通过沿着单个光纤传输两个不同的光波长信号来提高信号质量，每个光波长信号携带相同的RF信息。这导致载波噪声比提高了3 dB。 WDM组合了两个或多个以1550nm或1310nm为中心的波长。两个波长之间的典型差异是3nm。在其他实施例中，使用两个以上的波长。接收器例如是单个感光元件。在到达接收机时，两个RF信号的相位在光或RF域中被调整为相同。在其他实施例中，接收机包括两个光敏元件，每个光敏元件从接收器端WDM接收单个波长。在这种情况下，相位调整可以应用在光或RF域中的接收器处。

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