Abstract

We demonstrate tunable highly wavelength-selective filter based on a 2×2 asymmetric side-polished fiber coupler with dispersive interlayer in one of the coupling arms. The asymmetric fiber coupler is made of two side-polished fibers using identical single-mode fibers and one of the polished fibers is further chemically etched at the central evanescent coupling region to gain closer to the core. An optical liquid with different dispersion characteristics than that of silica fiber is used to fill up the etched hollow and therefore the propagation constant for the polished fiber with dispersive liquid becomes more dispersive and crosses with that of another untreated polished fiber. The location of the cross point and the cross angle between two propagation constant curves determine the coupling wavelength and coupling bandwidth as well as channel wavelength separation, respectively. The coupling wavelength can be tuned at least wider than 84 nm (1.326–1.410 µm) under index variation of 0.004 and with coupling ratios of higher than 30 dB.

© 2007 Optical Society of America

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  1. M. Sumetsky, Y. Dulashko, and M. Fishteyn, "Demonstration of a multi-turn microfiber coil resonator," in Proc. of OFC 2007, PDP46 (2007).
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
  20. M. J. F. Digonnet, "Passive and Active Fiber Optic Components," Ph. D. Dissertation, Stanford University (1983).
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    [CrossRef]

2006

2005

2004

N. K. Chen, S. Chi, and S. M. Tseng, "Narrow-band channel-dropping filter based on side-polished fiber with long interaction length," Jpn. J. Appl. Phys. 43, L475-L477 (2004).
[CrossRef]

N. K. Chen, S. Chi, and S. M. Tseng, "Wideband tunable fiber short-pass filter based on side-polished fiber with dispersive polymer overlay," Opt. Lett. 29, 2219-2221 (2004).
[CrossRef] [PubMed]

2002

1997

T. Erdogan, "Fiber grating spectra," J. Lightwave Technol. 15, 1277-1294 (1997).
[CrossRef]

1995

C. W. Wu, T. L. Wu, and H. C. Chang, "A novel fabrication method for all-fiber, weakly fused, polarization beamsplitters," IEEE Photon. Technol. Lett. 7, 786-788 (1995).
[CrossRef]

1994

1992

C. J. Chung and A. Safaai-Jazi, "Narrow-band spectral filter made of W-index and step-index fibers," J. Lightwave Technol. 10, 42-45 (1992).
[CrossRef]

1990

O. Leminger and R. Zengerle, "Narrow-band directional couplers made of dissimilar single-mode fibers with different cladding refractive indexes," J. Lightwave Technol. 8, 1289-1291 (1990).
[CrossRef]

1989

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

A. W. Snyder and Y. Chen, "Nonlinear fiber couplers: switches and polarization beam splitters," Opt. Lett. 14, 517-519 (1989).
[CrossRef] [PubMed]

1988

1987

R. Zengerle and O. Leminger, "Narrow-band wavelength-selective directional couplers made of dissimilar single-mode fibers," J. Lightwave Technol. LT-5, 1196-1198 (1987).
[CrossRef]

1985

1982

M. J. F. Digonnet and H. J. Shaw, "Analysis of a tunable single mode optical fiber coupler," IEEE J. Quan. Electron. QE-18, 746-754 (1982).
[CrossRef]

1981

Albert, J.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

Bilodeau, F.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

Burghoff, J.

Chang, H. C.

C. W. Wu, T. L. Wu, and H. C. Chang, "A novel fabrication method for all-fiber, weakly fused, polarization beamsplitters," IEEE Photon. Technol. Lett. 7, 786-788 (1995).
[CrossRef]

Chen, N. K.

N. K. Chen, S. Chi, and S. M. Tseng, "Wideband tunable fiber short-pass filter based on side-polished fiber with dispersive polymer overlay," Opt. Lett. 29, 2219-2221 (2004).
[CrossRef] [PubMed]

N. K. Chen, S. Chi, and S. M. Tseng, "Narrow-band channel-dropping filter based on side-polished fiber with long interaction length," Jpn. J. Appl. Phys. 43, L475-L477 (2004).
[CrossRef]

Chen, Y.

Chi, S.

N. K. Chen, S. Chi, and S. M. Tseng, "Wideband tunable fiber short-pass filter based on side-polished fiber with dispersive polymer overlay," Opt. Lett. 29, 2219-2221 (2004).
[CrossRef] [PubMed]

N. K. Chen, S. Chi, and S. M. Tseng, "Narrow-band channel-dropping filter based on side-polished fiber with long interaction length," Jpn. J. Appl. Phys. 43, L475-L477 (2004).
[CrossRef]

Chung, C. J.

C. J. Chung and A. Safaai-Jazi, "Narrow-band spectral filter made of W-index and step-index fibers," J. Lightwave Technol. 10, 42-45 (1992).
[CrossRef]

Das, A. K.

Digonnet, M. J. F.

M. J. F. Digonnet, J. R. Feth, L. F. Stokes, and H. J. Shaw, "Measurement of the core proximity in polished fiber substrates and couplers," Opt. Lett. 10, 463-465 (1985).
[CrossRef] [PubMed]

M. J. F. Digonnet and H. J. Shaw, "Analysis of a tunable single mode optical fiber coupler," IEEE J. Quan. Electron. QE-18, 746-754 (1982).
[CrossRef]

Erdogan, T.

T. Erdogan, "Fiber grating spectra," J. Lightwave Technol. 15, 1277-1294 (1997).
[CrossRef]

Feth, J. R.

Fuchs, U.

Gidon, S.

Hill, K. O.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

Jain, R. K.

Jia, X.

Johnson, D. C.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

Kuznetsov, A. A.

Leminger, O.

O. Leminger and R. Zengerle, "Narrow-band directional couplers made of dissimilar single-mode fibers with different cladding refractive indexes," J. Lightwave Technol. 8, 1289-1291 (1990).
[CrossRef]

R. Zengerle and O. Leminger, "Narrow-band wavelength-selective directional couplers made of dissimilar single-mode fibers," J. Lightwave Technol. LT-5, 1196-1198 (1987).
[CrossRef]

Libatique, N. J. C.

Limpert, J.

Malo, B.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

Mondal, M. A.

Morishita, K.

Nolte, S.

Ortaç, B.

Pan, Q.

Parriaux, O.

Pena, J. M. S.

Peng, K.

Safaai-Jazi, A.

C. J. Chung and A. Safaai-Jazi, "Narrow-band spectral filter made of W-index and step-index fibers," J. Lightwave Technol. 10, 42-45 (1992).
[CrossRef]

Shaw, H. J.

M. J. F. Digonnet, J. R. Feth, L. F. Stokes, and H. J. Shaw, "Measurement of the core proximity in polished fiber substrates and couplers," Opt. Lett. 10, 463-465 (1985).
[CrossRef] [PubMed]

M. J. F. Digonnet and H. J. Shaw, "Analysis of a tunable single mode optical fiber coupler," IEEE J. Quan. Electron. QE-18, 746-754 (1982).
[CrossRef]

Snyder, A. W.

Stokes, L. F.

Su, X.

Tan, A.

Thomas, J.

Tseng, S. M.

N. K. Chen, S. Chi, and S. M. Tseng, "Wideband tunable fiber short-pass filter based on side-polished fiber with dispersive polymer overlay," Opt. Lett. 29, 2219-2221 (2004).
[CrossRef] [PubMed]

N. K. Chen, S. Chi, and S. M. Tseng, "Narrow-band channel-dropping filter based on side-polished fiber with long interaction length," Jpn. J. Appl. Phys. 43, L475-L477 (2004).
[CrossRef]

Tünnermann, A.

Vargas, S. E.

Vazquez, C.

Wang, L.

Wikszak, E.

Wu, C. W.

C. W. Wu, T. L. Wu, and H. C. Chang, "A novel fabrication method for all-fiber, weakly fused, polarization beamsplitters," IEEE Photon. Technol. Lett. 7, 786-788 (1995).
[CrossRef]

Wu, T. L.

C. W. Wu, T. L. Wu, and H. C. Chang, "A novel fabrication method for all-fiber, weakly fused, polarization beamsplitters," IEEE Photon. Technol. Lett. 7, 786-788 (1995).
[CrossRef]

Xie, C.

Zengerle, R.

O. Leminger and R. Zengerle, "Narrow-band directional couplers made of dissimilar single-mode fibers with different cladding refractive indexes," J. Lightwave Technol. 8, 1289-1291 (1990).
[CrossRef]

R. Zengerle and O. Leminger, "Narrow-band wavelength-selective directional couplers made of dissimilar single-mode fibers," J. Lightwave Technol. LT-5, 1196-1198 (1987).
[CrossRef]

Appl. Opt.

Electron. Lett.

B. Malo, F. Bilodeau, K. O. Hill, D. C. Johnson, and J. Albert, "Unbalanced dissimilar-fibre Mach-Zehnder interferometer: application a filter," Electron. Lett. 25, 1416-1417 (1989).
[CrossRef]

IEEE J. Quan. Electron.

M. J. F. Digonnet and H. J. Shaw, "Analysis of a tunable single mode optical fiber coupler," IEEE J. Quan. Electron. QE-18, 746-754 (1982).
[CrossRef]

IEEE Photon. Technol. Lett.

C. W. Wu, T. L. Wu, and H. C. Chang, "A novel fabrication method for all-fiber, weakly fused, polarization beamsplitters," IEEE Photon. Technol. Lett. 7, 786-788 (1995).
[CrossRef]

J. Lightwave Technol.

C. Vazquez, S. E. Vargas, and J. M. S. Pena, "Sagnac loop in ring resonators for tunable optical filters," J. Lightwave Technol. 23, 2555-2567 (2005).
[CrossRef]

R. Zengerle and O. Leminger, "Narrow-band wavelength-selective directional couplers made of dissimilar single-mode fibers," J. Lightwave Technol. LT-5, 1196-1198 (1987).
[CrossRef]

C. J. Chung and A. Safaai-Jazi, "Narrow-band spectral filter made of W-index and step-index fibers," J. Lightwave Technol. 10, 42-45 (1992).
[CrossRef]

O. Leminger and R. Zengerle, "Narrow-band directional couplers made of dissimilar single-mode fibers with different cladding refractive indexes," J. Lightwave Technol. 8, 1289-1291 (1990).
[CrossRef]

T. Erdogan, "Fiber grating spectra," J. Lightwave Technol. 15, 1277-1294 (1997).
[CrossRef]

Jpn. J. Appl. Phys.

N. K. Chen, S. Chi, and S. M. Tseng, "Narrow-band channel-dropping filter based on side-polished fiber with long interaction length," Jpn. J. Appl. Phys. 43, L475-L477 (2004).
[CrossRef]

Opt. Express

Opt. Lett.

Other

M. J. F. Digonnet, "Passive and Active Fiber Optic Components," Ph. D. Dissertation, Stanford University (1983).

G. P. Agrawal, Fiber-Optic Communication Systems, (Wiley-Interscience, New York, 1997), Chap. 7.

M. Sumetsky, Y. Dulashko, and M. Fishteyn, "Demonstration of a multi-turn microfiber coil resonator," in Proc. of OFC 2007, PDP46 (2007).

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Figures (3)

Fig. 1.
Fig. 1.

Device structure of the coupler filter where an optical liquid is introduced in one of the coupling arms.

Fig. 2.
Fig. 2.

(a) Refractive index dispersion curves of silica, Cargille liquids (nD=1.440, 1.444, 1.446), and optical polymers (OCF-446, OC-431A). (b) Dispersion slope of the silica, Cargille liquids (nD=1.440, 1.444, 1.446), and optical polymers (OCF-446, OC-431A). (c) Effective indices of the SPF1 with optical materials and SPF2.

Fig. 3.
Fig. 3.

(a) Simulated spectral responses of the asymmetric coupler with variant dispersive interlayers and (b) experimental results of the transmission spectra using optical liquids under different optical resolution of OSA.

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