Abstract

A novel class of wavelength-selective coupling photonic crystal fiber (PCF) that operates by a hybrid light-guiding mechanism has been proposed. Different from the traditional PCF coupler operating principle, this fiber coupler shares properties of both the total internal reflection index-guided and the photonic bandgap mechanism. This coupler allows highly accurate control of the filtering wavelength; both bandstop and bandpass filters can be easily implemented. The spectral transmission results demonstrate that the bandpass characteristic of the coupler is very narrow and free of sidelobes. Moreover, the operating wavelength and the coupling length can be continuously tuned by changing the refractive index of the filling material. This research gives a physical insight into the propagation mechanism in the PCF coupler and is crucial for future applications of the proposed device.

© 2007 Optical Society of America

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References

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2006

2005

1998

B. Ortega and L. Dong, IEEE Photon. Technol. Lett. 10, 991 (1998).
[CrossRef]

B. Ortega and L. Dong, Opt. Lett. 23, 1277 (1998).
[CrossRef]

1989

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, Electron. Lett. 25, 1416 (1989).
[CrossRef]

1987

R. Zengerle and O. G. Leminger, J. Lightwave Technol. LT-5, 1196 (1987).
[CrossRef]

1985

M. S. Yataki, D. N. Payne, and M. P. Varnham, Electron. Lett. 21, 248 (1985).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Cross section of the hybrid light-guiding wavelength-selective PCF coupler.

Fig. 2
Fig. 2

Modal dispersion curves for the fundamental mode of the single-core index-guiding PCF and the single-core PBGF. The gray zones represent the fundamental gap and the secondary gap. The axes are effective index n eff and normalized wavelength λ Λ ; the curve with circles is the fundamental mode effective index computed for a simple index-guiding PCF formed by a pure silica core surrounded by holey silica. The curve with triangles shows the effective index of the high-index rods PBGF. The inset shows the intensity contour map at the intersect points A, λ 0 = 1.55 μ m , and B, λ 0 = 3.21 μ m , that is x-polarization electric field distribution mode (Ex).

Fig. 3
Fig. 3

x-polarized mode field distributions at (a) z = 0 , (b) L c 3 , (c) L c 2 , (d) 2 L c 3 , and (e) L c at λ 0 = 1.55 μ m .

Fig. 4
Fig. 4

Operating wavelength and the coupling length as a function of the refractive index, at point A as shown in Fig. 2.

Fig. 5
Fig. 5

Spectral coupling characteristics of the hybrid light-guiding PCF coupler when we change the high-index middle hole between the two solid cores to air. The FWHM bandwidth is 17 nm and the used fiber length is 3.6 mm .

Equations (1)

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L c = π β e i β o i , i = x , y ,

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