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light judgment circuit

A technology for judging circuits and voltages, applied in circuits, measuring circuits, lasers, etc., can solve the problems of large amplifier circuits occupying a large area, high cost, etc.

Inactive Publication Date: 2015-11-04
SERCOMM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amplifier circuit occupies a large area and high cost in the circuit layout, which does not meet the needs of modern products with small size and low price

Method used

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Embodiment Construction

[0027] The optical judging circuit proposed by the present invention can judge whether the laser module emits light by using a simple circuit structure, which can reduce the cost.

[0028] Please refer to figure 1 , which shows a circuit diagram of an optical judgment circuit according to an embodiment. The light judgment circuit 100 includes a laser module 110 and a detection circuit 120 . The laser module 110 has a first node N1 and includes a laser diode 112 . The detection circuit 120 has an output terminal O1 and includes a threshold voltage determination unit 121 , a detection unit 122 and a switching unit 124 . The threshold voltage determining unit 121 determines a threshold voltage corresponding to the laser module 110 . The threshold voltage determining unit 121 substantially determines the threshold voltage correspondingly according to different brands of laser diodes 112 . The detection unit 120 is coupled to the first node N1, and is used for comparing the vol...

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Abstract

A light determination circuit having a laser module and a detection circuit is provided. The detection circuit comprises a threshold voltage determination unit, a comparison unit and a switch unit. The threshold voltage determination unit determines a threshold voltage corresponding to the laser module. The comparison unit is for comparing a voltage level at a first node of the laser module with the threshold voltage to output a switch signal. The switch unit is controlled by the switch signal to switch the voltage level at an output end of the detection circuit. When the laser module is conducted, the voltage level at the first node is lower than the threshold voltage, the switch signal controls the switch unit, such that the output end outputs a high level voltage and vice versa.

Description

technical field [0001] The invention relates to an optical judging circuit. Background technique [0002] Traditionally, an amplifier circuit is used to determine whether a laser diode in a bidirectional optical subassembly (BOSA) emits light, and notifies a processor for subsequent processing. However, the amplifier circuit occupies a large area in the circuit layout and is expensive, which does not meet the needs of modern products with small size and low price. Contents of the invention [0003] The invention relates to a light judging circuit, which can judge whether a laser module emits light by using a simple circuit structure. [0004] According to the first aspect of the present invention, an optical judgment circuit is provided, including a laser module and a detection circuit. The laser module has a first node. The detection circuit has an output terminal. The detecting circuit includes a threshold voltage determining unit, a detecting unit and a switching un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26
CPCH03K17/78G01J1/44G01R31/26H01S5/0014H01S5/06808
Inventor 江孟谦黄元池
Owner SERCOMM CORP