公开(公告)号：WO9935518A3

公开(公告)日：2000-02-10

申请号：PCT/US9900121

申请日：1999-01-04

Applicant: CHORUM TECHNOLOGIES INC

Inventor： WONG CHARLES ,  CHEN YEN-CHEN ,  WU KUANG-YI ,  LIU JIAN-YU

IPC: G02F1/137 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/139 ,  G02F1/31

CPC classification number: G02F1/31 ,  G02F1/1396 ,  G02F2001/1398

Abstract: A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0 DEG and 90 DEG , and preferably between 50 DEG and 80 DEG is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than -25 dB. Preferably the liquid crystal entrance director (216) differs from the polarization direction (222) by a beta angle of about 15 DEG .

Abstract translation: 提供扭转角度在0°至90°之间，优选在50°至80°之间的扭转向列型液晶型电光调制器。 调制器提供相对较快的切换时间，例如小于约50毫秒，并提供相对较大的消光比，例如大于-25dB。 优选地，液晶入口导向器（216）与偏振方向（222）不同约15°的β角。