Harmonic Dark Pulse Emission in Erbium-Doped Fiber Laser
Zian Cheak Tiu1,2,3, Arman Zarei1,2, Sin Jin Tan3, Harith Ahmad2, Sulaiman Wadi Harun2**
1Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia 2Photonics Research Center, University of Malaya, Kuala Lumpur 50603, Malaysia 3School of Engineering, KDU University College, Petaling Jaya 47400, Malaysia
Abstract：A harmonic dark pulse generation in an erbium-doped fiber laser is demonstrated based on a figure-of-eight configuration. It is found that the harmonic dark pulse can be shifted from the fundamental to the 5th order harmonic by increasing the pump power with an appropriate polarization controller orientation. The fundamental repetition rate of 20 kHz is obtained at the pump power of 29 mW. The highest pulse energy of 42.6 nJ is obtained at the fundamental repetition rate. The operating frequency of the dark pulse trains shifts to 2nd, 3rd, 4th and 5th harmonic as the pump powers are increased to 34 mW, 50 mW, 59 mW and 137 mW, respectively.
2015, Vol. 32 
