Abstract

The CO₂ laser based fabrication of tapered long period gratings (TLPGs) is optimized so that their transmission spectra are comparable with those made using the arc-discharge technique, which typically exhibits transmission losses below 2 dB. The reduction in transmission loss was achieved by optimizing the micro-taper geometry and the duty-cycle of the device. A 6-period TLPG of period 378 μm exhibited a pass-band transmission loss of 0.6 dB, resonance band extinction values of 3 dB and had a physical length of 2.27 mm. The average refractive index sensitivity of a 6 period TPLG was measured and found to be 372 nm/RI.

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