Fabrication and Performance of 1.55 μ/m Transmission Glass-Echelon Grating Filters
- Resource Type
- Letter
- Authors
- Tachikawa, Yoshiaki
- Source
- Optical Review. November 1999 6(6):489-493
- Subject
- echelon grating
bandpass filter
transmittance spectrum
beam size
Gaussian light field
photonic network
Fourier series
- Language
- English
- ISSN
- 1340-6000
1349-9432
This paper describes the fabrication method and the measured spectral behavior of a 1.55 μm transmission glass-echelon grating filter. This echelon grating consists of a pile of identical plane-parallel glass plates constructed using a special assembling tool. The experimental result confirmed the accuracy of the Fourier transform which indicated that the spectral passband width was inversely proportional to the beam size. This feature makes it possible to use the filter as a bandpass filter or a comb filter when constructing photonic networks. The echelon filter has certain intrinsic advantages including a low insertion loss and polarization independence. Moreover, it offers good cost performance and excellent design flexibility.