Widely tunable long-period waveguide grating filters

Chiang, Kin Seng

doi:10.1117/12.703228

Cited by 3 publications

(1 citation statement)

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“…Recently, it has been reported that the waveguide coupler based on long-period waveguide grating (LPWG) could achieve 75 nm tuning range and realize thermal tuning [7][8][9]. Though the tuning speed is still slow and the FWHM of passband of this coupler is as wide as about 4 nm, it has potential to become a novel high performance filter.…”

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confidence: 99%

Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output

Zhang

Liu

Liao

et al. 2009

J Infrared Milli Terahz Waves

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An electro-optical tunable filter comprised of two paralleled identical long-period waveguide gratings is proposed in this paper. The filter has one input port and two separate output ports, outputting band-pass and band-rejection light respectively. Using poled electro-optical polymer material to fabricate its waveguide cores enable the filter's tuning speed to approach nanosecond order. With the aid of long-period waveguide gratings, the tuning range of the filter is Λ times larger than the conventional electro-optical filters. We built up a model to design and simulate the proposed tunable optical filter. We investigate the relationship between the parameters of the long-period waveguide grating and the characteristics of the tunable filter, such as tuning range and FWHM. The simulation results show that the tunable optical filter can realize high-speed tuning in the wavelength range of 1530 nm to 1560 nm, and the FWHM width can reach 0.8 nm. Compared with the conventional optical filters, the results show that a high-speed widely tunable optical filter with narrow pass band can be achieved.

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confidence: 99%