Ultrashort laser pulse induced core-mode blocker and its application to fabrication of all-fiber bandpass filter

摘要

We propose and demonstrate a practical application of femtosecond laser ablation technique for the fabrication of a core mode blocker. We also describe the core mode blocker-based all-fiber tunable bandpass filter with an insertion loss of 1.8dB and non-resonance wavelength suppression of 23dB.