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Wavelength aligning method and system

A wavelength and wavelength adjustment technology, applied in the field of communication, can solve the problems of poor temperature control accuracy and wavelength drift, and achieve the effect of improving system stability and reducing power

Active Publication Date: 2007-09-19
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual temperature controller cannot completely solve the problem, that is, the greater the difference between the junction temperature and the external temperature, the worse the temperature control accuracy, and when the temperature difference is large, the wavelength will also drift

Method used

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  • Wavelength aligning method and system
  • Wavelength aligning method and system

Examples

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Embodiment Construction

[0014] The embodiment of the present invention proposes a method for adjusting the wavelength by sending instructions and responding to the instructions, so as to align the wavelength with the channel. However, in the method embodied in the embodiment of the present invention, as long as the driving power of the temperature control is allowed, the temperature difference has no influence on the control accuracy. Use the LD of the ONU or ONT to send the upstream light, and then enter the receiver of the OLT after passing through two wavelength division multiplexers. If the wavelength of the light sent by the ONU or ONT is the same as the center wavelength of the wavelength division multiplexer channel aligned with the channel), then the loss at the WDM is minimal and the power reaching the receiver of the OLT is maximized.

[0015] The optical network unit ONU in the embodiment of the present invention includes an adjustable wavelength module, and the adjustable wavelength modul...

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Abstract

The invention discloses a wavelength alignment method. The method comprises as follow: optical line terminal OLT receives optical signal from optical network unit ONU, then detects the power of at least a part of the optical signal and determines the required adjustment value of the optical signal wavelength which is generated by the ONU according to the power of the optical signal; the OLT sends a instruction which contains the adjustment value to the ONU; after the instruction is received, the ONU adjusts the wavelength according to the adjustment value. The invention also discloses a wavelength alignment system and an optical network unit. By adopting the invention, the OLT sends the instruction to the ONU and control the ONU to adjust the wavelength, thus the wavelength mismatch between the ONU wavelength and the wavelength division multiplexing channel, which is caused by environmental temperature change and poor temperature control performance, is solved. The power is induced and the system stability is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a wavelength alignment method and system. Background technique [0002] The rapid development of pre-video services makes users' demand for bandwidth higher and higher. The 2M bandwidth of DSL can cope with the current data transmission business, but it is difficult to meet the video business. New broadband access networks such as EPON and GPON have further improved the bandwidth of the access network, but due to the use of time division multiplexing and burst mode technologies, the cost of the system remains high, and all users share the bandwidth, and the bandwidth of a single user It doesn't add much. The development of video services, especially the demand for high-definition video services, prompts people to develop access networks with larger bandwidths. The WDM-PON network based on wavelength division multiplexing inherits the bandwidth characteristics of WDM (Waveleng...

Claims

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Application Information

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IPC IPC(8): H04B10/08H04B10/155H04J14/02H04B10/075H04B10/572
Inventor 江涛
Owner HUAWEI TECH CO LTD
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