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Laser wavelength locking method and device

A wavelength locking and laser technology, applied in the field of lasers, can solve the problems of small frequency drift range, interruption of optical network system services, and inability to lock, etc., to ensure the normal operation of optical network systems and the effect of expanding the scope

Active Publication Date: 2016-05-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the process of realizing the above-mentioned prior art, the inventors found the following problems in the prior art: the range of frequency drift that can be compensated by the technical solution provided by the prior art is very small, and when the frequency drift of the laser exceeds the frequency range that can be compensated, the laser The frequency of the output light cannot be locked to the preset frequency of the current work, which will cause the service interruption of the optical network system applied by WDM (full name in English: Wavelength division multiplexing, full name in Chinese: wavelength division multiplexing)

Method used

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  • Laser wavelength locking method and device

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Embodiment 1

[0029] An embodiment of the present invention provides a method for laser wavelength locking, such as figure 1 As shown, the method includes:

[0030] 101. When it is detected that the frequency drift compensation value of the output light of the laser reaches a predetermined value, perform a boundary scan of the current working mode of the laser, and obtain a center frequency of the current working mode of the laser.

[0031] It is worth noting that the frequency drift of the output light of the laser means that the frequency of the output light of the laser changes.

[0032] In addition, the predetermined value in step 101 refers to an artificially set value that does not exceed the frequency drift range that can be compensated after the laser device is aged. The working mode in step 101 refers to the corresponding relationship between the phase current and the output light frequency of the laser, such as figure 2 As shown, the embodiment of the present invention takes th...

Embodiment 2

[0039] An embodiment of the present invention provides a method for laser wavelength locking, such as image 3 As shown, the method includes:

[0040] 201. When it is detected that the frequency drift compensation value of the output light of the laser reaches a predetermined value, perform boundary scan in the current working mode of the laser.

[0041] It is worth noting that the relevant content of the frequency shift of the laser output light and the predetermined value in step 201 is the same as that corresponding to step 101 in Embodiment 1, and will not be described in detail here.

[0042] In addition, if Figure 4 As shown, the specific methods for boundary scan include:

[0043] 2011. Adjust the current phase current, and detect whether the frequency of the output light jumps during the process of adjusting the current phase current.

[0044] It is worth noting that when the phase current is adjusted, the frequency of the laser output light changes according to a ...

Embodiment 3

[0069] An embodiment of the present invention provides a laser wavelength locking device, such as Figure 8 As shown, the device includes: a scanning unit 31 , a judging unit 32 , and an adjusting unit 33 .

[0070] The scanning unit 31 is configured to, when it is detected that the frequency drift compensation value of the output light of the laser reaches a predetermined value, perform a boundary scan of the current working mode of the laser, and acquire the center frequency of the current working mode of the laser.

[0071] The judging unit 32 is configured to judge whether the center frequency of the current working mode obtained by the scanning unit 31 corresponds to a preset frequency.

[0072] The adjusting unit 33 is configured to adjust the regulating current so that the center frequency of the current working mode corresponds to the preset frequency when it is determined according to the judging unit 32 that the center frequency of the current working mode does not c...

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Abstract

The invention provides a method and a device for locking the wavelength of a laser device, relates to the field of laser devices, expands the range of a frequency drift compensation value, and guarantees normal optical network system business of WDM (wavelength division multiplexing) applications. The method provided by the embodiment of the invention comprises the following steps: when detecting that the frequency drift compensation value of output light of the laser device reaches a predetermined value, scanning the boundary of current working mode of the laser device, and obtaining the central frequency of the current working mode; judging whether the central frequency of the current working mode corresponds to a preset frequency; when determining that the central frequency of the current working mode does not correspond to the preset frequency, adjusting the current to enable the central frequency of the current working mode to correspond to the preset frequency. The method is mainly applied to a process of locking the wavelength of the laser device.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a method and device for locking the wavelength of a laser. Background technique [0002] Due to the aging of the device, the output optical frequency of the laser will drift, so it is necessary to lock the wavelength of the aging laser. Wavelength tunable lasers with different working principles have different wavelength locking methods. For DS-DBR (English full name: The Digital Super-mode Distributed Bragg Reflector, Chinese full name: Digital Super-mode Distributed Bragg Reflector) and SG-DBR (English full name: Thesamplegrating Distributed Bragg Reflector, Chinese full name: Sampling Grating Distributed Bragg Reflector) principle lasers, you can The wavelength locking within the life cycle is realized by changing the phase phase current in real time. [0003] In the process of realizing the above-mentioned prior art, the inventors found the following problems in the prior art: the ran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/098
Inventor 金平邵秀良周波鲍伟辉
Owner HUAWEI TECH CO LTD