Control of laser wavelength tuning and its application in coherent optical time domain reflectometer

Lidong Lu; Xiaoyan Sun; Binglin Li

doi:10.1117/12.2257405

28 February 2017 Control of laser wavelength tuning and its application in coherent optical time domain reflectometer

Lidong Lu, Xiaoyan Sun, Binglin Li

Proceedings Volume 10256, Second International Conference on Photonics and Optical Engineering; 1025629 (2017) https://doi.org/10.1117/12.2257405
Event: Second International Conference on Photonics and Optical Engineering, 2016, Xi'an, China

Abstract

A laser diode temperature control scheme is adopted to achieve the laser wavelength tuning of a narrow linewidth laser, which sends commands by serial communication to change the laser diode temperature. The laser diode temperature is presented by the temperature sensitive resistance. And then the laser wavelength tuning method is also used in a coherent optical time domain reflectometer (C-OTDR) to reduce the coherent Rayleigh noise (CRN) caused by the coherence of the narrow linewidth laser. As the serial communication for the laser wavelength tuning is time-consuming which costs at least 10ms to finish the wavelength tuning once, the measurement time and efficiency of the C-OTDR should be considered. And then the relationship between the times for the laser wavelength changing and the CRN fluctuation is experimentally studied to balance the measurement time consumption and the measurement results, which illustrates that the laser wavelength needs not be changed in each measurement period of the C-OTDR and it can also obtain the ideal result to change the laser wavelength every 500 measurement periods. In traditional C-OTDR, by serial communication, the laser wavelength is changed in each measurement period and the total measurement periods are 2¹⁸, so by the new scheme it can save about 2600 seconds to achieve an ideal measurement, which is of high efficiency.

Citation Download Citation

Lidong Lu, Xiaoyan Sun, and Binglin Li "Control of laser wavelength tuning and its application in coherent optical time domain reflectometer", Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 1025629 (28 February 2017); https://doi.org/10.1117/12.2257405

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KEYWORDS

Wavelength tuning

Reflectometry

Semiconductor lasers

Beam controllers

Laser communications

Time metrology

Coherence (optics)

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