META Conference, META'10

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Effect of Temperature Variation on the Performance of Liquid-Filled Photonic Bandgap Fiber
Abdul hadi Mutasher Al-Janabi

Last modified: 2009-11-04

Abstract


Abstract: The present work focuses on the study of the tunability of HC-PCF infiltrated with liquids at different temperatures. The previous published works have been carried out using solid core PCF to build tunable filter. Infiltration of liquids in a HC-PCF means a refractive index contrast will change and consequently will affect the transmission properties of the fiber.

 

Five liquids (distilled water, n-hexane, methanol, ethanol and acetone) have been injected in the HC-PCF replacing the air. The linear transmission spectra for these liquids were measured using a spectrophotometer at different sets of temperatures. The non linear transmission spectra were also obtained for these liquids using a z-scan technique. The nonlinear refractive index (nB2B), and the nonlinear absorption coefficient (β) were obtained for silica / Liquid at a set of temperatures. Heating of liquids was done by a heater wrapped around the fiber and a precise temperature controller builds with accuracy about .

Three different laser wavelengths (Nd:YAG , He:Ne and green ) have been utilized to modulate the spectral position of the bandgaps in a HC-PCF infiltrated with aforementioned liquids. The transmission spectra were recorded before and after filling the HC-PCF with all five liquids as a function of temperature. The change in transmission properties of the fiber is investigated by CCD camera.

We have studied near field patterns over the photonic bandgap wavelength range. The transmission bands of filled fibers have shifted to shorter wavelengths (blue shift) and then shifted to longer wavelength (red shift) when these liquids subjected to heat. For both (blue and red) shifts the results are consistent with scaling index law predictions.

The thermal tuning sensitivity ,19cell HC-PCF after infiltration at different sets of temperatures, of the spectral position of the bandgap equal 0.32nm/CPoP for distilled water, 0.80825 nm/CPoP for n-hexane, 1.87 nm/CPoP for methanol, 0.989 nm/CPoP for ethanol and finally 1.264 nm/CPoP for acetone. The minimum sensitive filter is achieved when filling all the holes of 19 cell HC-PCF with distilled water and maximum sensitivity when filling with methanol at different sets of temperature.

REFERENCES

1-       Bhagwat A.R. and Gaeta,"Nonlinear optics in hollow-core photonic bandgap fibers"  Vol.16, No.7, (2008).

2-       Antonpoulos G. et al, "Experimental demonstration of the frequency shift of bandgaps in photonic crystal fibers due to refrective index scaling"Optics express ,Vol.14, No.7 (2006).

3-Birks, T.A., et al ,"Scaling laws and vector effects in bandgap guiding fibers"optics express, Vol.12,     No.74 (2004).