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Method and apparatus for tuning a tunable laser of an optical network element

A technology for tuning lasers and optical networks, applied in the field of communication systems

Active Publication Date: 2016-04-06
XIEON NETWORKS SARL
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Without one of these parameters being monitored and / or controlled accordingly, no synchronous tuning can be achieved to avoid said mode jumps

Method used

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  • Method and apparatus for tuning a tunable laser of an optical network element
  • Method and apparatus for tuning a tunable laser of an optical network element
  • Method and apparatus for tuning a tunable laser of an optical network element

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Embodiment Construction

[0065] The methods provided herein employ, inter alia, at least one of the following themes:

[0066] (a) On-time detection of imminent mode hopping: mode hopping is indicated by an increase in the phase noise and / or amplitude noise of the tunable laser, and thus can be measured by Costas at the receiver site (laser locked to the signal while tracking). The mode hopping is detected by tracking the bit error rate or control signal of the loop (for example, in the case of DQPSK's heterodyne detection method) or other carrier.

[0067] (b) The temperature may vary by a small amount ΔT relative to the ambient temperature. This temperature amount ΔT is generally the temperature change required to tune the frequency over substantially half the mode spacing without any additional measures.

[0068] (c) Imminent mode hopping can be predicted by evaluating the history of frequency control parameters.

[0069] (d) No special control of cavity phase alignment according to filter positi...

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Abstract

A method and apparatus for adjusting a tunable laser of an optical network element is provided, wherein the wavelength of the tunable laser is adjusted by changing the current driving the tunable laser; The temperature adjustment of the wavelength of the tunable laser.

Description

technical field [0001] The invention relates to a method and a device for adjusting a tunable laser of an optical network element and a communication system comprising such a device. Background technique [0002] Passive Optical Networking (PON) is a promising approach for fiber-to-the-home (FTTH), fiber-to-the-business (FTTB) and fiber-to-the-curb (FTTC) solutions, in particular because it overcomes traditional point-to- Economic limitations of point solutions. [0003] Several PON types have been standardized and are currently deployed worldwide by network service providers. A conventional PON distributes downlink services from an optical line terminal (OLT) to an optical network unit (ONU) in a broadcast manner, and the ONU sends uplink data packets multiplexed according to time to the OLT. Therefore, communication between ONUs needs to be transported through the OLT involving electronic processing, such as buffering and / or scheduling, which causes latency and reduces t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/27H01S5/06H01S5/14H04B10/272
CPCH01S5/02407H01S5/02453H01S5/0612H01S5/0622H01S5/141H04B10/272
Inventor E.戈特瓦尔德H.罗德S.斯莫洛尔茨
Owner XIEON NETWORKS SARL
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