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Systems and Methods for Reducing Adjacent Channel Leakage Ratio

A signal and multiplexer technology, applied in the field of network communication

Active Publication Date: 2018-11-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method imposes stringent requirements on the optical link in terms of linearity, noise and crosstalk

Method used

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  • Systems and Methods for Reducing Adjacent Channel Leakage Ratio
  • Systems and Methods for Reducing Adjacent Channel Leakage Ratio
  • Systems and Methods for Reducing Adjacent Channel Leakage Ratio

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Embodiment Construction

[0021] Embodiments of the invention relate to systems and methods for reducing adjacent channel leakage ratios in multi-channel communication networks.

[0022] figure 1 A high-level functional block diagram of an example of an analog radio over fiber (AROF) wavelength-division multiplexing (WDM) system 100 is shown. The AROF WDM system 100 includes a plurality of transmitters (Tx) 110 , a multiplexer (Mux) 120 , a demultiplexer (DeMux) 130 and a plurality of receivers 140 . radio frequency (RF in,x ) can be input to the transmitter (Tx x )110. per Tx x 110 will receive the RF in,x converted to the Tx x 110 with different wavelengths λ x light signal. The optical signals are sent via optical fibers to a multiplexer 120, which combines the signals into a single optical fiber. The combined signal is sent a distance via a relatively long optical fiber (typically a distance of many kilometers) to a demultiplexer 130, which is based on the wavelength λ of the signal x S...

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Abstract

An analog radio over fiber (AROF) wavelength division multiplexing (WDM) system and method for reducing adjacent channel leakage ratio (ACLR) in a radio frequency signal provided by an AROF WDM systemare provided. The AROF WDM system comprises a plurality of transmitters, a multiplexer, a demultiplexer, a plurality of receivers and a controller. Each transmitter is for receiving a radio frequencyinput signal and for modulating the radio frequency input signal onto an optical signal to obtain a modulated optical signal. The multiplexer is for receiving each modulated optical signal from the plurality of transmitters and for combining the modulated optical signals into a combined optical signal to be sent a distance over an optical fiber. The multiplexer has a pluralities of passbands witheach passband having a center wavelength. The demultiplexer is for receiving the combined optical signal and for separating the combined optical signal back into the individual modulated optical signals. Each receiver is for receiving one of the modulated optical signals from the demultiplexer and for converting the received modulated optical signal into a radio frequency output signal. The controller is configured to detune, for each transmitter, one of that transmitter and the multiplexer relative to the other such that a wavelength of the modulated optical signal transmitted by that transmitter is longer than the center wavelength of a corresponding one of the plurality of passbands of the multiplexer.

Description

[0001] References to related applications [0002] This application claims priority to U.S. Patent Application No. 15 / 366,125, filed December 1, 2016, entitled "Systems and Methods for Reducing Adjacent Channel Leakage Ratio," which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to the field of network communications, and in particular to systems and methods for reducing adjacent channel leakage ratios in multi-channel communications networks. Background technique [0004] For next-generation wireless systems that transmit analog signals directly to antennas, analog radio over fiber (AROF) is increasingly being considered as an alternative to conventional digital optical transmissions such as the common public radio interface (CPRI). Viable alternatives. A simple optical detector at the top of the antenna converts the analog optical signal into an analog electrical signal, which is amplified by a radio frequency (...

Claims

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Application Information

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IPC IPC(8): H04B10/572
CPCG02B6/12019H04B10/2507H04B10/2543H04B10/2575H04B10/25752H04J14/02H04J14/0256G02B6/12009H01S5/0612H04B10/25891
Inventor 伊凡·默罕默德·扎勒罗伯特·勒鲁
Owner HUAWEI TECH CO LTD