An optical network node of an ultra-dense wavelength division multiplexing passive optical network
A passive optical network and network node technology, applied in the field of optical network node design solutions, can solve problems such as high prices, improve utilization, solve relative wavelength drift, and ensure wavelength synchronization.
Active Publication Date: 2021-05-25
TIANJIN UNIV
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[0005] Aiming at the existing technology, the present invention proposes a design scheme for optical network nodes in an ultra-dense wavelength division multiplexing passive optical network, which not only uses the same wavelength to transmit uplink and downlink data, improves spectrum utilization, and further improves the carrying capacity of a single PON ; and the use of optical injection locking technology for homodyne coherent detection technology solves the problem that the optical receiver needs to use expensive local oscillator lasers in the traditional coherent receiving scheme, and improves the sensitivity of the optical receiver
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[0035] A design scheme of an ultra-dense wavelength division multiplexing passive optical network optical network node.
[0036] Such as figure 1 As shown, the optical network node includes a 1×2n coupler 1, n first optical circulators 2, n first polarization controllers 3, n second optical circulators 4, n distributed feedback Laser 5, n first 1×2 couplers 6, n second polarization controllers 7, n Mach-Zehnder modulators 8, composite signal analyzer 9, n third polarization controllers 10, n possible Dimming delay line 11, n second 1×2 couplers 12 and light detection device 13; from the 1×2n coupler 1, it is divided into 2n channels, which are respectively recorded as the first channel to the 2n channel, Every two adjacent channels form a group, such as the 1st channel and the 2nd channel as a group, the 3rd channel and the 4th channel as a group, etc., which are divided into n groups; the structure of each group of channels is the same , taking the first channel and the sec...
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The invention discloses an optical network node of an ultra-dense wavelength division multiplexing passive optical network, comprising a 1×2n coupler connected with n optical network nodes with the same structure, each optical network node They are independently connected to the two output ports of the 1×2n coupler. One port restores the optical carrier through optical injection locking. The restored optical carrier is divided into two paths, one as local oscillator light and the signal light transmitted by the other port. The coherent detection loop demodulates the downlink data signal, and the other loop modulates and sends the uplink user data. Beneficial effects of the present invention: adopting the active filtering mode of the injection-locked semiconductor laser ensures the discrimination between user data at small wavelength intervals, and provides high-quality local oscillator light for homodyne coherent detection; using the restored optical carrier to modulate uplink data, Improve the utilization rate of spectrum; and ensure the synchronization of uplink wavelength; finally provide users with green, efficient and high-speed broadband access services.
Description
technical field [0001] The invention relates to a design scheme of an optical network node in an ultra-dense wavelength division multiplexing passive optical network, in particular to an optical network node scheme based on uplink remodulation and homodyne coherent detection. Background technique [0002] In recent years, with the rapid development of broadband services, especially the explosive growth of data volume and network scale represented by streaming media technology, high-definition TV, cloud computing and other services, users are demanding large-scale, high-performance, low-power access The Internet presents an urgent need. Dense Wavelength Division Multiplexing Passive Optical Network (DWDM-PON) is considered to be the optimal networking technology in the next-generation passive optical network, and it has the advantages of transparent data transmission, high transmission bandwidth and network security. The ultra-dense wavelength division multiplexing passive o...
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IPC IPC(8): H04Q11/00
CPCH04Q11/0067H04Q2011/0045
Inventor 王菊贾婷于晋龙
Owner TIANJIN UNIV