Abstract: We present a method for the fabrication of a highly efficient core-mode blocker based on a laser micromachining technique. The process for the fabrication is as follows. A micron-sized crater is made by irradiation of an ultra-short pulse laser on the end face of a single-mode fiber, and then a defect that acts as a core-mode blocker is formed by splicing the cratered fiber with a normal fiber. The attenuation of the core mode was adjustable up to 25dB according to the initial crater size and the splicing condition. An all-fiber acousto-optic tunable bandpass filter built with the core-mode blocker is also demonstrated, which exhibits a low insertion loss of 1.8dB with non-resonance light suppression greater than 23dB.

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1. S. H. Yun, I. K. Hwang, and B. Y. Kim, “All-fiber tunable filter and laser based on two mode fiber,” Opt. Lett. 21(1), 27–29 (1996). [CrossRef] [PubMed]
2. H. S. Kim, S. H. Yun, I. K. Hwang, and B. Y. Kim, “All-fiber acousto-optic tunable notch filter with electronically controllable spectral profile,” Opt. Lett. 22(19), 1476–1478 (1997). [CrossRef]
3. I. K. Hwang, S. H. Yun, and B. Y. Kim, “All-fiber tunable comb filter with nonreciprocal transmission,” IEEE Photon. Technol. Lett. 10(10), 1437–1439 (1998). [CrossRef]
4. M. S. Lee, I. K. Hwang, and B. Y. Kim, “Acousto-optic tunable bandpass filter,” in Proc. OECC/IOOC 2001, pp. 324–325 (2001).
5. K. J. Lee, D. I. Yeom, and B. Y. Kim, “Narrowband, polarization insensitive all-fiber acousto-optic tunable bandpass filter,” Opt. Express 15(6), 2987–2992 (2007). [CrossRef] [PubMed]
6. D. S. Starodubov, V. Grubsky, and J. Feinberg, “All-fiber Bandpass Filter with Adjustable Transmission Using Cladding-Mode Coupling,” IEEE Photon. Technol. Lett. 10(11), 1590–1592 (1998). [CrossRef]
7. Y. G. Han, S. H. Kim, S. B. Lee, U. C. Paek, and Y. Chung, “Development of core mode blocker with H2-loaded Ge-B codoped fibres,” Electron. Lett. 39(15), 1107–1108 (2003). [CrossRef]
8. M. Lenzner, J. Krüger, S. Sartania, Z. Cheng, Ch. Spielmann, G. Mourou, W. Kautek, and F. Krausz, “Femtosecond Optical Breakdown in Dielectrics,” Phys. Rev. Lett. 80(18), 4076–4079 (1998). [CrossRef]
9. R. Stoian, D. Ashkenasi, A. Rosenfeld, and E. E. B. Campbell, “Coulomb explosion in ultra-short pulsed laser ablation of Al2O3,” Phys. Rev. B 62(19), 13167–13173 (2000). [CrossRef]

Electron. Lett.

• Y. G. Han, S. H. Kim, S. B. Lee, U. C. Paek, and Y. Chung, “Development of core mode blocker with H2-loaded Ge-B codoped fibres,” Electron. Lett. 39(15), 1107–1108 (2003). [CrossRef]

IEEE Photon. Technol. Lett.

• D. S. Starodubov, V. Grubsky, and J. Feinberg, “All-fiber Bandpass Filter with Adjustable Transmission Using Cladding-Mode Coupling,” IEEE Photon. Technol. Lett. 10(11), 1590–1592 (1998). [CrossRef]
• I. K. Hwang, S. H. Yun, and B. Y. Kim, “All-fiber tunable comb filter with nonreciprocal transmission,” IEEE Photon. Technol. Lett. 10(10), 1437–1439 (1998). [CrossRef]

Opt. Express

• K. J. Lee, D. I. Yeom, and B. Y. Kim, “Narrowband, polarization insensitive all-fiber acousto-optic tunable bandpass filter,” Opt. Express 15(6), 2987–2992 (2007). [CrossRef] [PubMed]

Opt. Lett.

• S. H. Yun, I. K. Hwang, and B. Y. Kim, “All-fiber tunable filter and laser based on two mode fiber,” Opt. Lett. 21(1), 27–29 (1996). [CrossRef] [PubMed]
• H. S. Kim, S. H. Yun, I. K. Hwang, and B. Y. Kim, “All-fiber acousto-optic tunable notch filter with electronically controllable spectral profile,” Opt. Lett. 22(19), 1476–1478 (1997). [CrossRef]

Phys. Rev. B

• R. Stoian, D. Ashkenasi, A. Rosenfeld, and E. E. B. Campbell, “Coulomb explosion in ultra-short pulsed laser ablation of Al2O3,” Phys. Rev. B 62(19), 13167–13173 (2000). [CrossRef]

Phys. Rev. Lett.

• M. Lenzner, J. Krüger, S. Sartania, Z. Cheng, Ch. Spielmann, G. Mourou, W. Kautek, and F. Krausz, “Femtosecond Optical Breakdown in Dielectrics,” Phys. Rev. Lett. 80(18), 4076–4079 (1998). [CrossRef]

Other

• M. S. Lee, I. K. Hwang, and B. Y. Kim, “Acousto-optic tunable bandpass filter,” in Proc. OECC/IOOC 2001, pp. 324–325 (2001).

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