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Optical module optical eye diagram ER controlling and adjusting method and system

A technology for controlling and adjusting optical modules, applied in the field of optical modules, can solve problems such as difficult control, and achieve the effect of improving production efficiency and saving debugging time.

Active Publication Date: 2015-10-28
SOURCE PHOTONICS CHENGDU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem in the prior art that the process of debugging the ER value of the eye diagram to the target value is not easy to control, and to provide a way to calculate the register value by measuring the power and bias current of the laser diode, so that the optical eye of the optical module Fig. ER value adjustment method to control the target value to save debugging time and improve the production efficiency of optical modules

Method used

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  • Optical module optical eye diagram ER controlling and adjusting method and system
  • Optical module optical eye diagram ER controlling and adjusting method and system
  • Optical module optical eye diagram ER controlling and adjusting method and system

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Embodiment 1

[0044] Embodiment 1: This embodiment provides an optical module optical eye diagram ER control adjustment method including:

[0045] Adjust the initial value of the ER register to 0 to ensure that the output of the laser is completely driven by the bias current at the beginning.

[0046] The laser diode sending power of the detection optical module is P A ,P B The corresponding bias current Bias A 、Bias B , the P A ,P B differ in size from each other;

[0047] According to formula I mod = ( P 1 - P 0 ) × [ ( HEX 2 DEC ( Bias A ...

Embodiment 2

[0065] Embodiment 2: as figure 2 , image 3 The present embodiment shown provides a system for calculating the register value by measuring the power and bias current of the laser diode, so as to debug and control the optical eye diagram ER of the optical module to the target value, including:

[0066] The driver chip includes a MOD register, and the driver chip is used to MOD according to the register value in the MOD register DAC Sending a bias current and a modulation current to the laser diode, the bias current and modulation current are used to drive the laser diode to emit light;

[0067] The detection device is used to detect the transmitting power of the laser diode and / or the real-time bias current received by the laser diode; in this embodiment, the detection device is only a power meter, and the bias current is driven by a laser Chip (Nanotech company's NT25L90 chip) checks the detection function that comes with it. When the driver chip used does not have an autom...

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Abstract

The invention relates to an optical module optical eye diagram ER controlling and adjusting method and system, which belong to the technical field of optical modules. The method comprises detecting bias currents BiasA and BiasB corresponding to the start power PA and PB of a laser diode of an optical module and calculating the modulated current value Imod corresponding to an optical module eye diagram ER target value. According to the modulated current value Imod, the corresponding register value MODDAC can be calculated. The register value MODDAC is then written into a MOD register of a laser driving chip. The laser driving chip, according to the register value, sends bias current to the laser diode so as to make the optical eye diagram ER reach the targeted value. In comparison to the prior art, the technical solutions provided by the invention directly adjust the register value step by step based on the optical eye diagram ER value. In this way, the time spent on adjusting can be substantially reduced and the production efficiency of optical modules can be improved.

Description

technical field [0001] The invention relates to the field of optical modules, in particular to an optical module optical eye diagram ER control and adjustment method and system. Background technique [0002] In the optical module, the laser driver chip outputs the modulation current and bias current to the laser diode. The actual modulation current output by the driver chip to the laser is usually related to the MOD register in the laser driver chip. Set a value of the register, and there will be The corresponding modulation current is output to the laser diode. The magnitude of the modulation current is proportional to the extinction ratio (ER) of the eye diagram, and the magnitude of the extinction ratio of the eye diagram can be controlled and adjusted by controlling and adjusting the magnitude of the modulation current. Therefore, the extinction ratio of the debugging eye diagram can be controlled by setting the value of the register in the laser driver chip. [0003] ...

Claims

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Application Information

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IPC IPC(8): H04B10/50H01S3/0941H01S3/13
Inventor 贾朝波黄远军谢初旭许远忠
Owner SOURCE PHOTONICS CHENGDU
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