Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical up/down-conversion-type optical phase conjugate pair signal transmission/reception circuit

By using optical phase conjugate signal pairs to generate double sideband waves and cancel nonlinear effects in optical fibers in optical radio systems, the problem of signal degradation in optical fibers is solved, simple and effective nonlinear effect compensation is achieved, and signal transmission is improved. linearity and quality.

Active Publication Date: 2017-05-24
NAT INST OF INFORMATION & COMM TECH
View PDF7 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of compensating the waveform distortion due to the nonlinear effect in the optical transfer path (optical transfer path: optical transfer path) by a circuit, there are following problems: the device becomes complicated; For phase-conjugated pair signals, it is necessary to use electrical signals subjected to preprocessing based on digital signal processing, etc., and to use multiple optical modulators; on the receiver side, electrical signal processing based on digital signal processing, etc., is required

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Next, the numerical analysis of the above system is carried out. In the following numerical analysis, the homodyne C-RoF system is used for analysis. It is assumed that multi-level signals with subcarriers of radio signals such as QPSK or QAM are transmitted to a distant distance through standard single-mode optical fiber. Figure 17 It is a schematic diagram of the system in the numerical analysis of an Example.

[0106] At the transmitter side of the C-RoF system, ie at the central station side, the continuous light is intensity modulated in a push-pull Mach-Zehnder modulator (MZM) set to zero bias. MZM uses RF signal for modulation as follows. The RF subcarrier signal with a frequency of 10 GHz is data-modulated by the IQ modulator to generate a QPSK signal. The symbol rate of this data is 5GBaud. This device can be used to generate a DSB-SC signal, that is, a C-RoF signal. The OSNR (at 0.1 nm) of the generated RoF signal was 27 dB.

[0107] The RoF signal is t...

Embodiment 2

[0111] Figure 19 It is the experimental structure diagram for the principle verification of the bias offset type electro-optic effect type phase conjugate signal pair generator. Here, through SMF transmission of 20-Gb / sQPSK, the compensation result of the self-phase modulation effect is shown. The transmission of the phase-conjugated signal pair is carried out through the structure of polarization multiplexing. On the transmitter side, the optical coupler branches the continuous light with a wavelength of 1552 nm output from the fiber laser with a line width of 10 kHz, and sends it to two independent quadrature modulators. The quadrature modulators are driven at the same time according to the same I, Q data. The driving signal is an NRZ signal generated by a pulse pattern generator, and is in the form of a waveform length of 215-1PRBS. The secondary Mach-Zehnder modulators of each quadrature modulator are biased at the null point. The main bias voltages are π / 2, -π / 2, res...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

To provide a method capable of easily compensating waveform distortion due to a non-linear effect caused by a complicated electric circuit, and a device for implementing the method. Provided are a method capable of effectively compensating signal degradation such as waveform distortion due to a nonlinear effect caused by an optical fiber that is an optical transfer path using an optical phase conjugate signal pair at the time of optical up-conversion or down-conversion, and a device capable of implementing the method. This emission device (25) includes an optical modulator (11), a signal source (13), an optical fiber (15), a multiplexing unit (17), a multiplexing local signal source (19), an optical detector (21), and a transmission antenna (23).

Description

technical field [0001] The present invention relates to a method and a device capable of effectively compensating the nonlinear effects of optical signals and radio over fiber (Radio over Fiber: radio frequency over fiber) signals transmitted in optical fibers. Background technique [0002] In radio-over-fiber systems, increasing the input strength to optical fibers is related to the increase in RF link gain and the extension of transmission distance. Therefore, increasing the input strength to optical fibers is an important technical issue. However, when the intensity of the input light to the optical fiber is increased, the linear transmission of the signal cannot be performed due to the nonlinear effect in the optical fiber. Therefore, in current radio-over-fiber systems, the input light intensity is limited to a few mW. [0003] On the other hand, optical phase shift keying (optical PSK), optical quadrature amplitude modulation (optical QAM) and other coherent optical t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2543G02F1/01G02F2/00H04B10/2575
CPCG02F2/00H04B10/2543H04B10/2575G02F1/2255G02F1/212H04B10/2507H04B10/516H04B10/58
Owner NAT INST OF INFORMATION & COMM TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com