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Optical module

An optical module and backlight technology, applied in the field of optical modules, can solve problems such as unstable laser output power

Active Publication Date: 2019-09-13
HISENSE BROADBAND MULTIMEDIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of this application provides an optical module, which can be used to solve the problem of unstable laser output power caused by mutual interference when two lasers in the optical module are turned on at the same time

Method used

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0024] Before explaining the embodiment of the present application in detail, the APC closed-loop mechanism of the optical module is briefly described.

[0025] Such as figure 2 As shown, one LD201, one PD202 and one driver 203 in the optical module can form a closed-loop system. Among them, LD201 and driver 203 are connected.

[0026] It should be noted that the driver 203 can output a bias current to the LD201, and the LD201 emits light under the drive of the bias current. Among them, most of the light emitted by the LD201 is emitted along the outgoing direction, and this part of the light can be called the front light. In addition, a very small part of the light will be irradiated on the PD202 along the direction opposite ...

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Abstract

The invention discloses an optical module, and belongs to the technical field of optical devices. In the optical module, when the first LD and the second LD are in an on state at the same time, the first driver compares the current value of the first backlight current fed back by the first PD with the reference value of the first backlight current to drive the first LD to emit light. When the first LD is turned on and the second LD is turned off, the first driver compares a first backlight current value fed back by the first PD with a second backlight current reference value to drive the firstLD to emit light. The state of the LD can be adjusted by the first driver. The first LD is driven to emit light by comparing different backlight current reference values with backlight current fed back by the first PD; therefore. Compared with the prior art that only one backlight current reference value is adopted from beginning to end to drive the LD to emit light, the method can effectively avoid the interference of another LD on the optical power of the LD, thereby ensuring the stability of the optical power output by the LD.

Description

technical field [0001] The present application relates to the technical field of optical devices, in particular to an optical module. Background technique [0002] A laser and a driver may be included in the optical module. Generally, the laser may include an LD (laser diode, laser diode) and a PD (photo detector, backlight detector). Wherein, the driver provides working current to the LD of the laser, and the LD outputs light under the action of the working current. Most of the light output by the LD will be emitted along the outgoing direction. This part of the light is called the front light, and a very small part of the light will be irradiated on the PD along the opposite direction of the outgoing direction. This part of the light can be called the backlight . The PD can convert the received backlight into a backlight current, and feed back the backlight current to the driver. Since the ratio of the front light to the back light is constant, the magnitude of the bac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/40H04B10/564H01S5/026
CPCH01S5/0264H04B10/40H04B10/564
Inventor 张强赵其圣
Owner HISENSE BROADBAND MULTIMEDIA TECH