J4 ›› 2012, Vol. 29 ›› Issue (3): 311-315.

• Laser Tech. and Devices • Previous Articles     Next Articles

Intensity noise of erbium doped fiber laser at low frequency suppression through optoelectronic feedback

ZHANG Fei, ZHU Jun, WANG Hui, YANG Ke, MA Liang-chuan, YU Ben-li   

  1. Key Laboratory of Opto-electronic Information Acquisition and Manipulation, Ministry of Education, Anhui University, Hefei  230039, China
  • Received:2011-04-12 Revised:2011-06-06 Published:2012-05-28 Online:2012-05-22

Abstract:

The low and medium frequency intensity noise of the EDFL is suppressed by using optoelectronic feedback. The factors affect the intensity noise of the EDFL is analyzed by the rate equations, the importance of the phase of the feedback signal in noise suppression are discussed by simulating and optimizing the feedback circuits. The experiment result shows: the peak relaxation oscillation (about 30 KHz) was reduced to about 35dB, at the low frequency band (below 20 KHz) falls to about 10dB averagely and the relaxation oscillation peak moving to the higher frequency is suppressed. The excellent noise property indicates that the laser source has important applications in optical sensors.

Key words: laser techniques, EDFL, intensity noise, optoelectronic feedback

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