.Transmission spectra of coated phase shifted long-period fiber gratings[J].Optoelectronics Letters,2009,5(4):244-247 |
Transmission spectra of coated phase shifted long-period fiber gratings |
顾铮 赵晓云 张江涛 |
Laboratory;Photo-electric;Functional;Films;College;Science;Shanghai;University;Technology;Modern;Optics;Optoelectric;Electric;Information;Engineering; |
Abstract: |
The transmission spectrum of the coated phase-shifted long-period fiber gratings (LPFGs) with single and multiple phase shifts
is analyzed by the coupled-mode theory and the transfer matrix method, and the influences of the film parameters on the spectral
characteristics are also studied. It is shown that these parameters will affect the LPFG filtering characteristics. The loss
peak of transmission spectrum decreases with the increase of film thickness, and the peak position shifts with the film refractive
index. Compared with the non-coated phase-shifted LPFG, the coated one has the similar desirable filtering characteristics,
and it has a flexible ability to adjust the transmission properties.
This work has been jointly supported by the National Natural Science Foundation of China (No. 60777035), Scientific Research
Key Project Fund of Ministry of Education (No. 208040), Research Project of Education Committee of Shanghai (No. 07ZZ87),
and Shanghai Leading Academic Discipline Project (No. T0501) |
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