Tunable Laser Generation with Erbium-Doped
Microfiber Knot Resonator¹

A. Sulaiman^a, S. W. Harun^{a, b,} *, F. Ahmad^{a, c}, S. F. Norizan^b, and H. Ahmad^b

^a Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

^b Photonics Research Center, Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia

^c Department of Electrical Engineering, Faculty of Engineering, University Teknologi Malaysia,
54100, Kuala Lumpur, Malaysia

*e-mail: swharun@um.edu.my

Received September 19, 2011; in final form, September 30, 2011; published online February 6, 2012

Abstract—A tunable laser is demonstrated using a microfiber knot resonator structure made by erbium-doped
fiber (EDF). The laser is made of a 2 m long EDF where 30 mm of its end section is tapered to construct a
microfiber knot resonator (MKR). The combination of the EDF and MKR generates a stable single wavelength
laser at 1555 nm wavelength with a signal to noise ratio (SNR) of 33.7 dB using a 63 mW of 980nm pump
power. The peak wavelength of the laser can be tuned by 340 pm as the MKR diameter reduces from 5.0 to 0.5
mm with an acceptable penalty in output power.

DOI: 10.1134/S1054660X12030218

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