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Extinction ratio controlling circuit, chip and optical module

A technology of control module and extinction ratio, applied in the field of optical communication, can solve the problem of low control accuracy, and achieve the effect of improving control accuracy

Inactive Publication Date: 2016-01-06
HISENSE BROADBAND MULTIMEDIA TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the above method, since the temperature lookup table is preset according to the empirical values, these empirical values ​​are generally determined when the trend of the extinction ratio with the temperature is a regular change, so when the change trend of the extinction ratio of the optical module is not regular When the extinction ratio is changed, or when other factors besides temperature also affect the extinction ratio, it will lead to lower control accuracy in the process of controlling the extinction ratio constant

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  • Extinction ratio controlling circuit, chip and optical module
  • Extinction ratio controlling circuit, chip and optical module
  • Extinction ratio controlling circuit, chip and optical module

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Embodiment Construction

[0022] The following will exemplarily describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] First of all, it should be noted that the extinction ratio ER is generally measured through the optical eye diagram; the signal transmitted in the optical module is a digital signal, including "1" level (ie high level) and "0" level (that is, low level); ER is the logarithm of the ratio of the optical power corresponding to the "1" level in the optical eye diagram to the optical power corresponding to the "0" level, and the calculation formula can be: ER=10*log( P...

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Abstract

The invention discloses an extinction ratio controlling circuit, a chip and an optical module, relates to the technical field of optical communication, and aims at improving the control precision in the constant extinction ratio control process. The circuit is applied to the optical module which comprises a modulation current generation module and an emission optical assembly. The circuit comprises a modulation current control module, the input end of the modulation current control module is connected with the output end of the emission optical assembly, and the output end of the modulation current control module is connected with the control end of the modulation current generation module, and the modulation current control module controls the modulation current generated by the modulation current generation module by utilizing current values corresponding to high level and low level in backlight current output by the emission optical assembly, so that the extinction ration is constant.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a circuit, a chip and an optical module for controlling the extinction ratio. Background technique [0002] The optical module includes a transmitting part and a receiving part. In the performance test, an important indicator for evaluating the transmitting performance of the optical module is the extinction ratio (ExtinctionRatio, ER). When the temperature of the laser in the optical module changes, the extinction ratio will change accordingly. [0003] At present, the modulation current and bias current of the laser are generally adjusted by a temperature look-up table method so as to keep the extinction ratio constant. Specifically: record the modulation current and bias current of the laser required for a constant extinction ratio at different temperatures in advance according to empirical values ​​in the temperature lookup table; when the temperature of the la...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/564
CPCH04B10/564
Inventor 李福宾
Owner HISENSE BROADBAND MULTIMEDIA TECH