Broadband radio frequency modulation circuit of laser

A technology of radio frequency modulation and laser, which is applied in fiber optic radio, fiber optic transmission, electrical components, etc., and can solve the problems of low modulation efficiency of lasers

Inactive Publication Date: 2012-08-15
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

[0006] Aiming at the shortcomings of the prior art, the present invention provides a laser broadband radio f

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  • Broadband radio frequency modulation circuit of laser
  • Broadband radio frequency modulation circuit of laser
  • Broadband radio frequency modulation circuit of laser

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Embodiment Construction

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. 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.

[0025] In order to overcome the shortcomings of the prior art, the present invention provides a high-efficiency, ultra-broadband laser radio frequency modulation circuit from the perspective of RoF system application to meet the system performance requirements of the future RoF system for radio frequency photoelectric conversion modules. Specifically, the laser broadband radio frequency modulation circuit provided by the present invention mainly include...

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Abstract

The invention relates to the field of an optical communication technology and provides a broadband radio frequency modulation circuit of a laser. The circuit comprises a peaking inductor, a depletion type FET (field effect transistor) geminate transistor, a broadband impedance matching circuit, a broadband Bias-T circuit, an impedance transmission line and a matching resistor. In the technical scheme, as the broadband impedance matching circuit is used, the impedance matching can be flexibly reduced, thus realizing non-loss transmission of a radio frequency signal, achieving the high-efficiency modulation of the laser within a frequency range from 0.45GHz to 10GHz, and well meeting the requirement of an RoF (radio-over-fiber) system on transparent transmission of radio frequency bands of GSM (Global System For Mobile Communication), WCDMA (Wideband Code Division Multiple Access), 802.11a/b/g, WiMax, LTE and the like in the next-generation wireless communication system.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a laser broadband radio frequency modulation circuit. Background technique [0002] In optical fiber communication systems, the small-signal impedance of the active region of the semiconductor laser is very small when it is working normally, and can usually be ignored. However, as the operating frequency of the radio over fiber (RoF, Radio over Fiber) communication system increases to the microwave or millimeter wave band, for the direct modulation system, the laser modulation performance will be greatly affected by the parasitic parameters of the laser chip package and the transmission line parameters. Therefore, it is usually necessary to achieve impedance matching between the laser chip and the laser modulation circuit. [0003] The commonly used RF system impedance is mostly 50Ω. In order to reduce the reflection coefficient of the laser modulation circui...

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Application Information

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IPC IPC(8): H04B10/155H04B10/2575H04B10/516
Inventor 汤兆星徐坤
Owner BEIJING UNIV OF POSTS & TELECOMM
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