公开(公告)号：US20030026532A1

公开(公告)日：2003-02-06

申请号：US10029058

申请日：2001-12-20

Applicant: APPLIED OPTOELECTRONICS, INC.

Inventor： Stefan J. Murry ,  Chih-Hsiang Lin

IPC: G02B006/26 ,  H01S003/13

CPC classification number: G01J9/00 ,  G02B6/12007 ,  H01S5/0687 ,  H01S5/141 ,  H01S5/18361

Abstract: A zigzag waveguide device-based apparatus and method for achieving or maintaining wavelength lock for a tunable laser designed to generate light at a selected one of a plurality of target wavelengths. The apparatus has a reflectively coupled zigzag waveguide device for receiving a portion of light output by the tunable laser, the zigzag waveguide device having a plurality of filters, each having a passband centered at a respective one of the plurality of target wavelengths, whereby said zigzag waveguide device produces a plurality of filtered light outputs. A plurality of photosensors is provided, one for each of said plurality of filters, each said filter positioned to receive a respective one of the plurality of filtered light outputs, each said filter producing a filter output signal related to the intensity of said portion of light in the passband of the corresponding filter. A processor generates, in response to the plurality of filter output signals, a control signal to adjust the lasing wavelength of the tunable laser to achieve or maintain said selected one of the target wavelengths. In one embodiment, the zigzag waveguide device includes a first waveguide that is coupled to the laser to receive light output. A first wavelength filter is coupled to the first waveguide to receive light therefrom. The first wavelength filter transmits a band of wavelengths and reflecting one or more bands of wavelengths. A second waveguide is coupled to the first wavelength filter and receives light reflected from the first wavelength filter. A mirror is coupled to the second waveguide and receives light from the second waveguide. A third waveguide is coupled to the mirror to receive light reflected from the mirror. A second wavelength filter is coupled to the third waveguide to receive light therefrom. The second wavelength filter transmits a band of wavelengths different from the band of wavelengths transmitted by the first wavelength filter and reflects one or more bands of wavelengths. A first photodiode is coupled to receive light transmitted by the first wavelength filter. A second photodiode is coupled to receive light transmitted by the second wavelength filter. A laser wavelength controller is coupled to the tunable laser and is capable of modifying the wavelength of the tunable laser based at least in part on an output of one of the first and second photodiodes.

公开(公告)号：US20020172237A1

公开(公告)日：2002-11-21

申请号：US10029018

申请日：2001-12-20

Applicant: APPLIED OPTOELECTRONICS, INC.

Inventor： Stefan J. Murry ,  Chih-Hsiang Lin ,  N. Stephan Kinsella

IPC: H01S003/098 ,  H01S003/10

CPC classification number: G02B6/12007 ,  H01S5/0687 ,  H01S5/141 ,  H01S5/18361

Abstract: A planar lightwave circuit (PLC) module for conditioning light output from a tunable laser designed to generate light at a target wavelength. The PLC module has a substrate; a primary waveguide embedded in said substrate, said primary waveguide having an input end for receiving light from the tunable laser and an output end for outputting said light; and at least a first secondary waveguide embedded in said substrate, said first secondary waveguide receiving a first portion of said light from the tunable laser. A filter having a passband centered on the target wavelength is coupled to an output of the first secondary waveguide to receive said first portion of light, and generates a signal related to the intensity of said first portion of light in the passband centered on the target wavelength. This may be used by a processor and associated laser control circuitry for wavelength locking purposes.

Abstract translation: 一种平面光波电路（PLC）模块，用于调节设计成产生目标波长的光的可调激光器的光输出。 PLC模块具有基板; 嵌入在所述衬底中的初级波导，所述初级波导具有用于接收来自所述可调激光器的光的输入端和用于输出所述光的输出端; 以及至少一个嵌入在所述衬底中的第一次级波导，所述第一副波导接收来自所述可调激光器的所述光的第一部分。 具有以目标波长为中心的通带的滤波器被耦合到第一次级波导的输出以接收所述第一部分光，并且产生与以目标波长为中心的通带中的所述第一部分光的强度相关的信号 。 这可以由处理器和相关联的激光控制电路用于波长锁定目的。