A dual-orthogonal polarization multiplexing intensity modulation system and its demultiplexing method
An intensity modulation and polarization multiplexing technology, applied in polarization multiplexing systems, transmission systems, electromagnetic wave transmission systems, etc., to achieve the effects of high spectral efficiency, low method complexity, and low cost
Inactive Publication Date: 2019-05-10
SOUTHWEST JIAOTONG UNIV
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[0008] The technical problem to be solved by the present invention is to provide a dual orthogonal polarization multiplexing intensity modulation system and its demultiplexing method, without increasing the complexity of the transmitter, receiver and method, only one Stokes The analyzer demultiplexes the 2×PDM-IM / DD system, and at the same time, can quickly track the change of the polarization state
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[0066] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0067] Such as figure 1 As shown, the method of the present invention consists of two or 2N orthogonal polarization multiplexed intensity modulated optical signals 101 1 ~1012 N , one or N optical couplers 102 1 ~102 N , a wavelength division multiplexer 103, an optical amplifier 104, a section of optical fiber 105, a wavelength division multiplexer 106, one or N Stokes analyzers 107 1 ~107 N and a digital signal processing unit 108. The specific logical relationship is as follows: multiple PDM-IM optical signals with different wavelengths 101 1 ~101 2N After being transmitted to the central office, N couplers 102 1 ~102 N Synthesize N channels of 2×PDM-IM optical signals and synthesize them into a wavelength division multiplexed 2×PDM-IM optical signal through a wavelength division multiplexer 103; the multiplexed optical si...
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The invention discloses a dual orthogonal polarization multiplexing intensity modulation system and a demultiplexing method thereof. The system is as follows: two paths of orthogonal polarization multiplexing intensity modulation optical signals are jointly connected to an optical coupler, and the optical coupling A device, a wavelength division multiplexer, an optical amplifier, an optical fiber, a wavelength division multiplexer, a Stokes analyzer, and a digital signal processing unit are connected in sequence. The method includes: at the transmitting end, generating double-orthogonal polarization multiplexing signals, and multiplexing the signals at different polarization angles through a polarization controller and an optical coupler; at the receiver end, using Stokes analysis The instrument is used as a receiving method to obtain the electrical signal I 0 , I 0deg , I 45deg and I RC ; Use real-time DSP signal processing to realize steps such as demodulation and recovery of multiplexed signals. While ensuring the flexibility of the transmitting end and the receiving end in the optical network, the invention simplifies the structure of the receiving end, doubles the communication capacity and reduces the cost.
Description
technical field [0001] The invention relates to the fields of short-distance optical interconnection, data center, access network, etc., in particular to a bi-orthogonal polarization multiplexing intensity modulation / direct detection system and a demultiplexing method based on a Stokes analyzer. Background technique [0002] Since Dr. Kao published the article "Optical Frequency Dielectric Fiber Surface Waveguide" in 1966, optical fiber communication has experienced nearly half a century of development. With the joint efforts of several generations of researchers, optical fiber communication has been widely used in transoceanic communication, backbone network, intercity network and other fields. The rapid development of coherent optical communication and digital signal processing (DSP) technology has increased the capacity-distance product of optical communication to the Exabit / s·km level. [0003] However, the high cost of coherent optical communication is not suitable for...
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IPC IPC(8): H04B10/54H04J14/06
CPCH04B10/541H04J14/06
Inventor 闫连山盘艳蒋林易安林潘炜罗斌邹喜华
Owner SOUTHWEST JIAOTONG UNIV