1 September 2008 A dual-wavelength narrow-linewidth laser system, with ultranarrow wavelength spacing, is proposed and demonstrated. The operation principle of the laser system is based on the pump-induced thermal effects of the Er-Yb-doped fiber distributed Bragg reflect
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Optical Engineering, 47(9), 094401 (2008). doi:10.1117/1.2978950
Abstract
Using the amplified spontaneous emission (ASE) from an erbium-doped fiber amplifier (EDFA) at zero signal condition, the shifting of resonant wavelengths in a mechanically induced long-period fiber grating (MLPFG), resulting from the intensity induced effects is demonstrated. The theoretical and experimental investigations on the ASE-induced effects in an MLPFG are presented. The developed theory is concise and is useful for differentiating the index changes due to Kerr and other intensity-dependent effects in a long-period fiber grating (LPFG). It is demonstrated that the induced index will be high for the LP11 resonance near the third telecommunication window and is negligible for the LP12 resonance. Because of the increase in microbend loss at each groove of the MLPFG, the thermally induced nonlinear effects lessen at higher values of applied pressures
V. P. Sudeep Kumar, B. Unnikrishnan Nair, Vellara Pappukutty Mahadevan Pillai, V. Unnikrishnan Nayar, "A dual-wavelength narrow-linewidth laser system, with ultranarrow wavelength spacing, is proposed and demonstrated. The operation principle of the laser system is based on the pump-induced thermal effects of the Er-Yb-doped fiber distributed Bragg reflect," Optical Engineering 47(9), 094401 (1 September 2008). http://dx.doi.org/10.1117/1.2978950
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KEYWORDS
Cladding

Refractive index

Thermal effects

Optical fibers

Absorption

Optical engineering

Wavelength tuning

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