公开(公告)号：US06842587B1

公开(公告)日：2005-01-11

申请号：US09538224

申请日：2000-03-30

申请人： Douglas D. McGhan ,  Alen Chan

发明人： Douglas D. McGhan ,  Alen Chan

IPC分类号： H04B10/155 ,  H04B10/04

CPC分类号： H04B10/503

摘要： A semiconductor optical amplifier (SOA) is placed in the optical path between the tunable laser and the external modulator on a DWDM optical transmitter. The modulator transfer function is measured using low-level amplified spontaneous emission light output from the SOA in order to find the modulator bias corresponding to minimum transmission. The external modulator is biased to the point of minimum transmission to reduce the transmitter output power during laser turn-on. The SOA bias is also turned off to provide further attenuation as the laser is turned on. Similarly, to avoid emitting off-wavelength light during wavelength changes, the transmitter output is attenuated with a combination of low SOA bias current and biasing the modulator to its minimum transmission point. In both cases, the laser wavelength is allowed to stabilize without interfering with adjacent DWDM channels.

摘要翻译： 半导体光放大器（SOA）放置在DWDM光发射机上的可调谐激光器和外部调制器之间的光路中。 使用来自SOA的低电平放大自发发射光来测量调制器传递函数，以便找到对应于最小传输的调制器偏置。 外部调制器偏置到最小传输点，以减少激光打开时的发射机输出功率。 当激光打开时，SOA偏压也被关闭以提供进一步的衰减。 类似地，为了避免在波长变化期间发射非波长光，发射机输出通过低SOA偏置电流的组合衰减并将调制器偏置到其最小传输点。 在这两种情况下，允许激光波长稳定而不干扰相邻的DWDM通道。

公开(公告)号：US07305183B2

公开(公告)日：2007-12-04

申请号：US09975985

申请日：2001-10-15

申请人： Kim B. Roberts ,  Giuseppe G. Bordogna ,  Riyaz R. Jamal ,  Douglas D. McGhan ,  Maurice S. O'Sullivan

发明人： Kim B. Roberts ,  Giuseppe G. Bordogna ,  Riyaz R. Jamal ,  Douglas D. McGhan ,  Maurice S. O'Sullivan

IPC分类号： H04B10/08 ,  H04B17/00 ,  H04B10/00 ,  H04J14/06

CPC分类号： H04B10/2572

摘要： A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDE is evaluated using the predetermined initial polarization state and the detected polarization state.

摘要翻译： 一种方法和系统能够测量包括多个级联光学部件的光通信系统中的偏振相关损耗（PDL）。 具有预定初始极化状态的光信号被发射到光通信系统中。 在发射点下游的选择的检测点处检测信号的偏振状态。 使用预定的初始极化状态和检测到的偏振状态来评估PDE。