Biorthogonal polarization multiplexing intensity modulation system and demultiplexing method thereof
A technique of intensity modulation and polarization multiplexing, applied in polarization multiplexing systems, transmission systems, electromagnetic wave transmission systems, etc., to achieve high spectral efficiency, low cost, and low method complexity
Inactive Publication Date: 2017-06-30
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 biorthogonal polarization multiplexing intensity modulation system and a demultiplexing method thereof. According to the system, two paths of orthogonal polarization multiplexing intensity modulation optical signals are connected to one optical coupler together; and the optical coupler, a wavelength division multiplexer, an optical amplifier, an optical fiber, a wavelength division demultiplexer, a stokes analyzer and a digital signal processing unit are sequentially connected. The method comprises the steps of: at a transmitting terminal, generating double orthogonal polarization state multiplexed signals, and by a polarization controller and the optical coupler, multiplexing the signals together at different polarization angles; at a receiver terminal, by using the stokes analyzer as a receiving mode, obtaining electric signals I0, I0deg, I45deg and IRC; implementing demodulation and recovery of the multiplexed signals by utilizing real-time DSP (Digital Signal Processing); and the like. According to the biorthogonal polarization multiplexing intensity modulation system and the demultiplexing method thereof, which are disclosed by the invention, when flexibility of the transmitting terminal and the receiver terminal in an optical network is ensured, the structure of the receiver terminal is simplified, communication capacity is multiplied, and cost is reduced.
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