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Flexibly tunable multichannel filter and bandpass filter based on long-period fiber gratings

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Abstract

The voltage-controllable multichannel filter based on multiply cascaded long-period fiber gratings with a divided coil heater will be proposed and experimentally demonstrated. It has several advantages of the large tuning range in both C- and L-band, multichannel operation, multiwavelength selectivity, and bandwidth controllability. The tunable bandpass filter based on long-period fiber gratings with the broad bandwidth over 6.5 nm, large tuning range over 30 nm, and excellent side mode suppression more than 40 dB will be also discussed.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Measured transmission characteristics of tunable multichannel filter when the applied voltage increased.
Fig. 2.
Fig. 2. Schematics of the voltage-controllable multichannel filter based on cascaded LPFGs (a) and the voltage-controllable bandpass filter with a core mode blocker (b). Once the core mode blocker is placed in the middle of two gratings, the tunable bandpass filter can be fabricated.
Fig. 3.
Fig. 3. The experimental results of the wavelength shift of three channels when the applied voltage increased. The linear fitting was -3.4 nm/V.
Fig. 4.
Fig. 4. Transmission characteristics of the tunable bandpass filter with the voltage change corresponding to the cladding mode order. Multiple passbands occur in the spectrum because the core mode is generally coupled to several cladding modes in the LPFGs.
Fig. 5.
Fig. 5. Measured results of the resonant wavelength shift corresponding to the cladding mode order when the applied voltage increased.

Equations (3)

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a Co a Cl Out = T 1 · T 2 T N a Co ( 0 ) a Cl ( 0 ) ,
Δ λ λ 2 Δ n · D ,
Q = V 2 R t = V 2 R n N T ,
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