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Optical transmitter

A technology of optical transmitters and radio frequency signals, which is applied in electromagnetic transmitters, electromagnetic wave transmission systems, electrical components, etc., and can solve problems such as low output optical power

Inactive Publication Date: 2018-08-07
杭州万隆光电设备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1310nm optical transmitter not only has low output optical power, but also the wavelength of 1310nm is the zero dispersion window of G652 optical fiber

Method used

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  • Optical transmitter

Examples

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Embodiment Construction

[0018] The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

[0019] refer to figure 1 , an optical transmitter, comprising an electrical attenuation circuit 1 for connecting to an input terminal of a radio frequency signal, a DFB laser 7 for connecting to an output terminal of an optical signal, a predistortion circuit 8 and a control module, and the electrical attenuation circuit 1 sequentially passes through a radio frequency amplifier 2. The first splitter 3, the delay circuit 4, the second splitter 5 are connected to the DFB laser 7, the predistor...

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Abstract

The invention discloses an optical transmitter, belonging to the field of photoelectricity. The optical transmitter comprises an electrically tuning attenuation circuit for connecting an input end ofan RF signal, a DFB laser for connecting an output end of an optical signal, a predistortion circuit and a control module, wherein the electrically tuning attenuation circuit is connected with the DFBlaser sequentially through an RF amplifier, a first splitter, a time delay circuit, and a second splitter, the predistortion circuit is connected with the first splitter and the second splitter, andthe control module is connected with the electrically tuning attenuation circuit, the DFB laser and the predistortion circuit.

Description

【Technical field】 [0001] The invention relates to an optical transmitter. 【Background technique】 [0002] Compared with the 1550nm optical transmitter using external modulation mode, the price of the 1550nm direct modulation optical transmitter is much lower; compared with the 1310nm optical transmitter, the 1550nm direct modulation optical transmitter can be driven by cascaded 1550nm optical amplifiers users; due to the above two significant advantages, 1550nm direct modulation optical transmitters will be widely used when cable TV operators build FTTH networks. [0003] Due to the influence of optical fiber dispersion effect, the optical signal with a wavelength of 1550nm will be distorted when it is transmitted in the optical cable; and this distortion will continue to be serious with the extension of the distance. The optical signal distortion caused by the dispersion effect of optical fiber, the final appearance in the optical link of the cable television system is tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/588
CPCH04B10/50593H04B10/588
Inventor 许泉海朱国堂余兴洪任国瑞
Owner 杭州万隆光电设备股份有限公司