Optical power control method and apparatus
An optical power control and power technology, applied in the field of optical communication, can solve problems such as submersion and weakening of test signals, and achieve the effect of ensuring normal operation and avoiding signal strength weakening.
Active Publication Date: 2012-10-10
HUAWEI TECH CO LTD
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[0006] In order to solve the above-mentioned problem that the test signal is weakened or even submerged due to automatic power control, the present application provides an optical power control method and device, wherein the optical power control device may specifically be a light source driver, an optical transceiver module or an optical line terminal
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[0016] The technical solutions provided by the present application will be described in detail below with reference to specific embodiments.
[0017] In order to solve the problem that the OTDR test signal is weakened or even submerged due to the use of the APC loop for automatic control of the output optical power in the prior art, the present application proposes to use the APC loop open-loop / closed-loop seamless loop in the optical transceiver module of the optical line terminal. Switch the bias current of the control light source (such as a laser), so that the light source bias current of the optical transceiver module remains unchanged during the OTDR test, thereby ensuring the signal strength of the OTDR test signal during the OTDR test, and effectively solving the OTDR test. The problem that the signal may be significantly weakened or even drowned due to automatic power control.
[0018] For better understanding of the present invention, the following first introduces t...
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The application provides an optical power control method. The optical power control method comprises: monitoring the output optical power of a light source, and determining whether a preset test control signal is received or not; if the preset test control signal is not received, modulating data signals to the output light of the light source, and according to the monitoring result of the output optical power of the light source, modulating the bias current of the light source so that automatic optical power control can be realized; and when the preset test control signal is received, starting the test and overlapping the test signal to the data signals and modulating the data signal to the output light of the light source, and further, neglecting the monitoring result of the output optical power of the light source during the test period, maintaining the bias current of the light source at a preset target value. The application further provides an optical power control apparatus.
Description
technical field [0001] The present application mainly relates to optical communication technologies, and in particular, to a method and device for controlling optical power of a passive optical network. Background technique [0002] As "optical advance and copper retreat" has gradually become the mainstream access method of network technology, the application of optical access technology has developed vigorously. Passive Optical Network (PON) technology is an optical access technology based on Point to Multi Point (P2MP). A line terminal (Optical Line Terminal, OLT), a plurality of optical network units (Optical Network Unit, ONU) located on the user side, and an optical distribution network for distributing or multiplexing data signals between the optical line terminal and the optical network unit. [0003] In order to ensure the power budget of the network link, the data transmission part of the optical line terminal usually adopts an automatic optical power control (Auto...
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IPC IPC(8): H04B10/00H04B10/08
CPCH04B10/071G01M11/3109H01S5/042H01S5/0683H04B10/40H04B10/07H04B10/564
Inventor 钟德刚杨素林李胜平李泽彬
Owner HUAWEI TECH CO LTD