公开(公告)号：US3717769A

公开(公告)日：1973-02-20

申请号：US3717769D

申请日：1971-08-16

Applicant: BELL TELEPHONE LABOR INC

Inventor： HUBBARD W ,  LI T

IPC: H04B10/02 ,  H04B10/18 ,  H04B9/00

CPC classification number: H04B10/2507

Abstract: BECAUSE OF IMPERFECTIONS IN OPTICAL FIBERS, LIGHT PROPAGATING THEREALONG IS CONTINUOUSLY BEING SCATTERED AND RESCATTERED. SOME OF THIS SCATTERED ENERGY IS TRAPPED WITHIN THE FIBER IN A PROPAGATING MODE AND ULTIMATELY REACHES THE OUTPUT OF THE FIBER DELAYED RELATIVE TO THE INPUT SIGNAL. IT IS SHOWN THAT THE DOUBLE-REVERSE SCATTERING RESPONSE OF A FIBER IS VERY NEARLY THE SAME AS THE RESPONSE OF AN R-C INTEGRATOR FOR THE SAME INPUT. ACCORDINGLY, THE EFFECTS OF DOUBLE-REVERSE SCATTERING INTERFERENCE CAN BE SUBSTANTIALLY REDUCED BY PASSING A PORTION OF THE RECEIVED SIGNAL THROUGH AN R-C INTEGRATOR AND INJECTING THE INTEGRATED SIGNAL THUS PRODUCED BACK INTO THE MAIN SIGNAL PATH IN TIME COINCIDENCE WITH THE SIGNAL SO AS TO CANCEL THE INTERFERENCE COMPONENT.

公开(公告)号：US3852591A

公开(公告)日：1974-12-03

申请号：US40808673

申请日：1973-10-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： LEE T ,  LI T

IPC: G02B6/34 ,  H01L31/00 ,  H04B10/18 ,  H01J39/12

CPC classification number: H04B10/2507 ,  G02B6/29394 ,  G02B6/4215 ,  H01L31/00 ,  Y10S438/936

Abstract: In optical fiber transmission, one of the causes of signal distortion (pulse broadening) stems from the fact that energy at different optical wavelengths travels at different velocities in the fiber material (material dispersion), and hence these wavelength components undergo different time delays while propagating through the fiber. In order to reduce this optical distortion, a p-n junction photodiode made of a graded bandgap semiconductor material is disclosed as a delay equalizing detector. The gradient of the bandgap is made in such a manner that the different time delays of drifting charge carriers, generated by the absorption of different wavelengths at different depths in the graded bandgap semiconductor, can be made to compensate for the time delays suffered by the optical energy at different wavelengths while propagating through the fiber.

Abstract translation: 在光纤传输中，信号失真（脉冲展宽）的原因之一源于以下事实：不同光波长的能量在纤维材料（材料分散）中以不同的速度行进，因此这些波长分量在传播时经历不同的时间延迟 通过纤维。 为了减小这种光学失真，公开了由渐变带隙半导体材料制成的p-n结光电二极管作为延迟均衡检测器。 带隙的梯度以这样的方式进行，使得通过在渐变带隙半导体中的不同深度处的不同波长的吸收产生的漂移电荷载流子的不同时间延迟可以被做成补偿光学器件遭受的时间延迟 在通过纤维传播的同时波长不同的能量。

公开(公告)号：US3804489A

公开(公告)日：1974-04-16

申请号：US31268272

申请日：1972-12-06

Applicant: BELL TELEPHONE LABOR INC

Inventor： LI T ,  STANDLEY R

IPC: G02F1/035 ,  G02F1/313 ,  G02F1/26

CPC classification number: G02F1/035 ,  G02F1/3137 ,  G02F2201/124 ,  G02F2201/302

Abstract: An optical switch useful in thin-film electro-optic light guides relies on an induced stationary diffraction grating. The grating is produced by an interdigital electrode structure which is deposited on the electro-optic guide. The application of a voltage to the electrode pattern produces a spatial modulation of the refractive index of the guide which acts as a diffraction grating to light traveling in the guide. This grating causes light in the guide to be diffracted out of the guide, thereby stopping transmission. Removal of the voltage eliminates the grating and restores transmission.

Abstract translation: 用于薄膜电光导光子的光学开关依赖于诱导的固定衍射光栅。 光栅由沉积在电光导体上的叉指电极结构产生。 向电极图案施加电压产生作为衍射光栅的导向器的折射率的空间调制以在导向器中行进的光。 该光栅使引导件中的光从引导件衍射出来，从而停止传输。 去除电压消除光栅并恢复传输。