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Light emission module laser control circuit of front end optical communication platform of wired television

An optical transmission module and cable TV technology, which is applied in the optical transmission equipment of the computer room based on the cable TV front end (or sub-front end), hybrid fiber-coaxial cable network two-way network transformation, and the field of laser control circuit of the optical transmission module, which can solve the problem of laser damage, Distortion and degradation of output signal indicators, overheating of lasers and other problems, to achieve the effect of protection from damage

Active Publication Date: 2012-10-10
CHANGSHU GAOSHIDA PHOTOELECTRICITY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the aging or temperature change of the laser, the "threshold current" and "bias current" will change, which will cause the photoelectric conversion efficiency, output power, operating point, and peak position of the laser emission wavelength to change, causing the output of the optical receiver to change. The level is reduced, and at the same time it causes the distortion and deterioration of the output signal index
When the laser temperature constant function and optical power automatic control function fail, causing the laser to overheat, overpower and other faults, the laser will be damaged

Method used

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  • Light emission module laser control circuit of front end optical communication platform of wired television

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Embodiment Construction

[0007] Refer to the figure: the present invention keeps the output power of the laser basically constant, the laser constant temperature control circuit makes the laser work within a set temperature range, and controls the temperature of the laser at 25±5°C. The detection signals of POWER (optical power), BAIS (bias current), TEMP (temperature), and TEC (cooling and heating current) of the laser are output to the data acquisition circuit of the light emitting module to complete the laser control control of the light emitting module. Pin 1, 2, 6, 7 of laser U5, transistor V7, V8, diode D7, D8, operational amplifier U4, adjustable potentiometer W6, electrolytic capacitor C20, C22, capacitor C8-C18, resistor R26-R29, R35- R38 constitutes the laser thermostat control circuit. When the current flows from pin 7 of laser U5 to pin 6 of laser U5, it cools and reduces the temperature of the laser. When the current flows from pin 6 of laser U5 to pin 7 of laser U5, it controls Heat, inc...

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Abstract

The invention relates to a light emission module laser control circuit of a front end optical communication platform of a wired television, belonging to the technical field of wired televisions. The light emission module laser control circuit comprises a laser U5, operational amplifiers U1-U4, diodes D1-D8, triodes V1-V8, a thyristor V9, adjustable potentiometers W1-W6, an inductor L1, electrolytic capacitors C19-C21, capacitors C1- C18, a relay JD1 and resistors R1-R45, wherein the laser U5 is a 1688 laser of the Ortel company, and the operational amplifiers U1-U4 are LM258 operational amplifiers. The invention has the advantages of basic constant output power and capability of protecting the laser from being broken.

Description

technical field [0001] The invention relates to an optical emission module laser control circuit of a cable TV front-end optical communication platform, which belongs to the technical field of cable TV, in particular to a cable TV front-end (or sub-front-end) machine room optical fiber for transformation of a hybrid optical fiber coaxial cable network two-way network transmission device. Background technique [0002] Today, with the integration of the three networks and the rapid development of the network technology of the next-generation radio and television network (NGB), broadband, two-way, digital, and the transformation of the new generation of radio and television networks are advancing rapidly; Internet, enterprise private network, VOIP, digital TV and other value-added services Vigorous development; radio and television is moving towards the majority of carrier-class operators. Facing the market, customers and service is the only choice. According to the requireme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/145H04B10/155H04N7/22H04B10/516
Inventor 凤笑宇许国益周宇崔静静
Owner CHANGSHU GAOSHIDA PHOTOELECTRICITY TECH