Invention Grant
- Patent Title: Polarization control systems and methods with endless polarization tracking using a dithering algorithm
- Patent Title (中): 使用抖动算法进行无极极化跟踪的极化控制系统和方法
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Application No.: US12499678Application Date: 2009-07-08
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Publication No.: US08305504B2Publication Date: 2012-11-06
- Inventor: Yunfeng Shen , Shan Zhong , Xiumin Liu
- Applicant: Yunfeng Shen , Shan Zhong , Xiumin Liu
- Applicant Address: US MD Hanover
- Assignee: Ciena Corporation
- Current Assignee: Ciena Corporation
- Current Assignee Address: US MD Hanover
- Agency: Clements Bernard PLLC
- Agent Christopher L. Bernard; Lawrence A. Baratta, Jr.
- Main IPC: G02F1/1335
- IPC: G02F1/1335

Abstract:
The present disclosure includes a configuration of a polarization control system and an algorithm that realize fast polarization controlling and tracking while avoiding the Glitch problems (i.e., loss of polarization tracking). The polarization controller includes multiple stages along with tunable orientation and retardation angles. The retardation angles are initialized to at least two different values for better polarization tracking in normal mode. In a normal mode, only the orientation angles of the polarization controller are dithered. When the monitored error is higher than the threshold, the polarization controller enters a glitch mode, and Glitch detection can be improved through error signal data processing. In the Glitch mode, at least one retardation angle is dithered along with the orientation angles. After the Glitch problem is avoided, the polarization controller stops dither the retardation angles and move all wave plates back to their initial values, and the polarization controller enters the normal mode.
Public/Granted literature
- US20110007232A1 POLARIZATION CONTROL SYSTEMS AND METHODS WITH ENDLESS POLARIZATION TRACKING USING A DITHERING ALGORITHM Public/Granted day:2011-01-13
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