Fabrication of a highly efficient core-mode blocker using a femtosecond laser ablation technique
- Fabrication of a highly efficient core-mode blocker using a femtosecond laser ablation technique
- 임선도; 김재구; 이관일; 이상배; 김병윤
- Issue Date
- Optics express
- VOL 17, NO 21, 18449-18454
- We present a method for the fabrication of a highly efficient coremode
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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