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UDWDM-PON transmitter based on wavelength automatic locking and tracking technology

A UDWDM-PON, automatic locking technology, applied in the coupling of optical waveguides, optical guides, optics, etc., can solve the problem of difficulty in wavelength synchronization, ensure user wavelength synchronization, overcome the influence of wavelength uncertainty, and achieve automatic locking and tracking Effect

Active Publication Date: 2018-10-26
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above prior art, the present invention provides a UDWDM-PON transmitter based on automatic wavelength locking and tracking technology, which not only solves the problem of difficult synchronization of wavelengths in the network caused by unstable channel spacing, but also overcomes the problem of caused by the wavelength uncertainty effect, and completes the automation of reference distribution in the network

Method used

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  • UDWDM-PON transmitter based on wavelength automatic locking and tracking technology
  • UDWDM-PON transmitter based on wavelength automatic locking and tracking technology
  • UDWDM-PON transmitter based on wavelength automatic locking and tracking technology

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Effect test

Embodiment 1

[0022] Embodiment 1: Using the implementation method of the UDWDM-PON transmitter based on the automatic wavelength locking and tracking technology of the present invention, the automatic tracking of one of the channels within 12 minutes and the fluctuation of the beat frequency signal during the tracking process were tested as follows.

[0023] Taking the test of the first channel as an example, the center wavelength of the mode-locked laser 2 is adjusted to 1553.052 nm. After using the wavelength automatic locking and tracking technology, the output wavelength fluctuation and beat frequency signal fluctuation results of DFB laser 8 are as follows: figure 2 with image 3 As shown, within 0-500s, the output wavelength of the DFB laser 8 is stable at the 1553.052nm benchmark of the mode-locked laser 2, and the power fluctuation of the beat frequency signal is stable within 3dB at this time; 1553.52nm changes to 1553.066nm, at this time, the DFB laser 8 and the mode-locked las...

Embodiment 2

[0024] Embodiment two: Utilize the implementation method of the UDWDM-PON transmitter based on the wavelength automatic locking and tracking technology of the present invention, the stability of eight channels in the UDWDM-PON transmitter within 12min has been tested as follows:

[0025] Apply the wavelength automatic locking and tracking technology to the eight-way channel of the UDWDM-PON transmitter of the present invention, adjust the central wavelength of the mode-locked laser 2 to be 1553.143nm, and the channel spacing stability test situation is as follows Figure 4shown. from Figure 4 It can be seen that the channel spacing of the eight channels is almost stable at 0.04nm within 12min. It is worth noting that the third, sixth and eighth channels have a relative wavelength shift between the DFB laser and the reference of the corresponding mode-locked laser, and each of the three channels has a wavelength scan as Figure 4 As shown by the black circle in the middle, e...

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Abstract

The invention discloses a UDWDM-PON transmitter based on the wavelength automatic locking and tracking technology. The UDWDM-PON transmitter includes a laser, an attenuator and a first 1x8 coupler which are connected in sequence to a microwave source; 8 channels are formed after the first 1x8 coupler. All the channels are concentrated on an optical fiber through a second 8x1 coupler; the laser isa mode-locked laser; the first, third, fifth, and seventh channels are odd-numbered channels, and the second, fourth, sixth, and eighth channels are even-numbered channels. The odd-numbered channels are used as the downlink optical carrier to carry the downlink data, and the even-numbered channels are used as the uplink optical carrier to complete the transmission of the user information. An optical frequency comb generated by the mode-locked laser is used as a wavelength reference, and the injection locking is performed on the plurality of DFB lasers to complete the separation of the wavelength reference, so that the problem of wavelength synchronization in the access network is solved; and selective modulation is performed on the separated multiple channels to track the wavelength reference of the mode-locked laser, and the stability of the small channel spacing in the access network can be ensured.

Description

technical field [0001] The invention relates to a UDWDM-PON transmitter based on wavelength automatic locking and tracking technology. Background technique [0002] In today's society, the rapid expansion of network scale and the continuous growth of network capacity requirements make the research of large-scale access network technology a hot spot. Among them, the technology widely adopted is Time Division Multiplexing Passive Optical Network (TDM-PON) technology, which satisfies capacity requirements by dividing time slots for users. Another widely used technology is dense wavelength division multiplexing passive optical network (DWDM-PON) technology, and this technology avoids the trouble of having to match the bandwidth of the receiver and the transmitter in TDM-PON. The emergence of ultra-dense wavelength division multiplexing passive network (UDWDM-PON) technology reduces the channel spacing of 100-200GHz in DWDM-PON to the order of GHz, so UDWDM-PON technology is exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293G02B6/27
CPCG02B6/27G02B6/293
Inventor 王菊王帅帅李天宇马闯谢田园于洋于晋龙
Owner TIANJIN UNIV
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