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Proceedings Paper

An automatic mode-locked system for passively mode-locked fiber laser
Author(s): Sha Li; Jun Xu; Guoliang Chen; Li Mei; Bo Yi
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Paper Abstract

This paper designs and implements one kind of automatic mode-locked system. It can adjust a passively mode-locked fiber laser to keep steady mode-locked states automatically. So the unsteadiness of traditional passively mode-locked fiber laser can be avoided. The system transforms optical signals into electrical pulse signals and sends them into MCU after processing. MCU calculates the frequency of the signals and judges the state of the output based on a quick judgment algorithm. A high-speed comparator is used to check the signals and the comparison voltage can be adjusted to improve the measuring accuracy. Then by controlling two polarization controllers at an angle of 45degrees to each other, MCU extrudes the optical fibers to change the polarization until it gets proper mode-locked output. So the system can continuously monitor the output signal and get it back to mode-locked states quickly and automatically. States of the system can be displayed on the LCD and PC. The parameters of the steady mode-locked states can be stored into an EEPROM so that the system will get into mode-locked states immediately next time. Actual experiments showed that, for a 6.238MHz passively mode-locked fiber lasers, the system can get into steady mode-locked states automatically in less than 90s after starting the system. The expected lock time can be reduced to less than 20s after follow up improvements.

Paper Details

Date Published: 23 December 2013
PDF: 7 pages
Proc. SPIE 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 904313 (23 December 2013); doi: 10.1117/12.2037523
Show Author Affiliations
Sha Li, Univ. of Science and Technology of China (China)
Jun Xu, Univ. of Science and Technology of China (China)
Guoliang Chen, Univ. of Science and Technology of China (China)
Li Mei, Univ. of Science and Technology of China (China)
Bo Yi, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 9043:
2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing
Yi Dong; Xiaoyi Bao; Chao Lu; Xiangjun Xin; Xuping Zhang, Editor(s)

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