Device for simulating optical link linearization

A linear and optical fiber technology, applied in the field of microwave signal optical domain transmission, can solve the problems of residual nonlinearity, difficult realization of optical and radio frequency power distribution, and non-linear distortion can not be completely suppressed, so as to achieve nonlinear and offset intermodulation distortion effect

Inactive Publication Date: 2016-09-07
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Due to the difficulty in achieving accurate and stable distribution of optical and radio frequency power in this device, the nonlinear distortion cannot be completely suppressed, and generally there will be residual nonlinear

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  • Device for simulating optical link linearization
  • Device for simulating optical link linearization
  • Device for simulating optical link linearization

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Embodiment Construction

[0031] The following will clearly and completely 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 creative efforts fall within the protection scope of the present invention.

[0032] refer to figure 1 , a device for simulating the linearization of an optical link provided by an embodiment of the present invention, the device includes a Mach-Zehnder modulator 100, a bias control module 130, a first fiber coupler 110, a second fiber coupler 120 , a low-pass optical receiver 140 , a photodetector 150 and a biaser 160 .

[0033] Wherein, the Mach-Zehnder modulator 100 loads the radio frequency signal obtained from the radio frequency genera...

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Abstract

The invention discloses a device for simulating optical link linearization. The device comprises a Mach-Zehnder modulator, a bias control module, a first optical fiber coupler, a second optical fiber coupler, a low-pass optical receiver, a photoelectric detector and a bias tee; the Mach-Zehnder modulator carries out intensity modulation on an inputted radio frequency signal; the first optical fiber coupler divides an inputted signal into two signals; the bias control module controls the Mach-Zehnder modulator to make the same be a preset bias point according to a received signal; the second optical fiber coupler divides an inputted signal into two signals; the low-pass optical receiver filters a received signal; the bias tee mixes a direct-current bias voltage and an alternating-current signal filtered out by the low-pass optical receiver together so as to adopt a mixed signal as the bias signal of the photoelectric detector; and the photoelectric detector multiplies the two received signals. With the device provided by the embodiments of the invention adopted, nonlinearity can be suppressed.

Description

technical field [0001] The invention relates to the field of microwave signal optical domain transmission, in particular to a device for simulating the linearization of optical links. Background technique [0002] Analog Optical Link (APL) is becoming an ideal choice for radio frequency (RF) signal transmission and processing due to its advantages of high bandwidth, low insertion loss and insusceptibility to electromagnetic interference, and has been used in radio over fiber communication (RoF, Radio over Fiber ) system, cable TV and many other aspects have been applied. For analog optical links, bandwidth, gain and dynamic range are the main indicators for evaluating system performance. Since the Mach-Zehnder modulator (MZM) widely used in APL itself has a nonlinear transfer function, the MZM will cause the system to generate intermodulation distortion (IMD). method removed, IMD will eventually limit the dynamic range of the link. Therefore, an important research content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69H04B10/54H04B10/2575
CPCH04B10/697H04B10/2575H04B10/54H04B10/691
Inventor 戴一堂屠丹尹飞飞徐坤李建强
Owner BEIJING UNIV OF POSTS & TELECOMM
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