Broad-band tunable all-fiber bandpass filter based on hollow optical fiber and long-period grating pair

LG Electron. PRC, Kyunggi-Do, South Korea
IEEE Photonics Technology Letters (Impact Factor: 2.11). 02/2005; 17(1):115 - 117. DOI: 10.1109/LPT.2004.838301
Source: IEEE Xplore


We report a tunable all-fiber bandpass filter based on a short hollow optical fiber serially concatenated between a pair of long-period fiber gratings. With novel core mode blocking in the hollow core fiber and its optimal design, the device showed a low insertion loss of 1.5 dB and broad-band passband tuning range of 84.3 nm covering both S- and C-band.

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Available from: B.H. Lee, Oct 29, 2013
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    • "For narrow bandwidth applications, fiber Bragg gratings (FBG) can be used for both bandstop filtering (operating in the transmission mode) and bandpass filtering (operating in the reflection mode) [4], [5]. Long period gratings can also be used as a platform to form tunable bandpass filters, for example, by using a combination of LPGs in a partially core removed fiber [6], by inducing a -phase shift in the grating [7], or by using an acousto-optic LPG with either a core block [8], [9] or hollow fiber to remove the uncoupled light [10]. For bandstop applications several other schemes based on long period gratings (LPGs) [5], [11], [12] and liquid crystal filled photonic crystal fibers [13]–[15] have been reported. "
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    ABSTRACT: We present a simple, efficient and easy to fabricate single-multi-single mode (SMS) fiber-based tunable bandwidth op-tical bandpass/bandstop filter. The device exploits the transmission characteristics of an SMS structure near its critical wavelength. Using both temperature and strain tuning, we show that the device can be switched between band pass to band stop modes and that the filter bandwidth in each mode can be dynamically tuned. We present a theoretical analysis of the observed behavior and obtain excellent agreement with the experimental observations.
    Journal of Lightwave Technology 12/2010; 28(15):3535-3541. DOI:10.1109/JLT.2010.2090035 · 2.97 Impact Factor
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    • "Recently, the authors reported an all-fiber BPF based on a null core HOF serially concatenated between a pair of helicoidal long-period fiber gratings (HLPFGs) with flexible transmission control capability [3]. The tunable all-fiber BPF was demonstrated by using an HOF core mode blocker fusion-spliced between a pair of LPFGs with the lowest insertion loss and widest tuning range [4], [5]. However, these devices need the additional electric circuitry for control functionality or require two LPFGs which have exactly the same resonance property. "
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    ABSTRACT: We report an all-fiber wavelength-tunable bandpass filter with multimode to single-mode converting property via serially concatenated structure of a helicoidal long-period fiber grating (HLPFG), a ring-core hollow optical fiber (HOF), and a multimode fiber (MMF). After passing the cascaded HLPFG-ring core HOF-MMF, the bandpass filtering characteristic and the mode conversion between multimode and single-mode were realized at the resonant wavelength of the HLPFG. Due to the novel spectral functionality of the HLPFG for directional torsion to the helix, the proposed device also showed wavelength-tunable bandpass filtering operation with low polarization-dependent loss.
    IEEE Photonics Technology Letters 04/2008; 20(6):404-406. DOI:10.1109/LPT.2008.916921 · 2.11 Impact Factor
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    • "In order to achieve low loss and high extinction of a core mode, the core mode blocker should be properly designed. It is reported that the core-mode blocking efficiency reaches its maximum when the hole diameter of HOF nearly matches the core diameter of the LPFG fiber where it is spliced to [5]. In this experiment, HLPFG fiber had the core diameter of 9 m and, accordingly, the hole and outer diameter of HOF were designed as 9 and 125 m, 1041-1135/$25.00 © 2007 IEEE Authorized licensed use limited to: Yonsei University. "
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    ABSTRACT: We report an all-fiber bandpass filter (BPF) based on a null core hollow optical fiber serially concatenated between a pair of helicoidal long-period fiber gratings (HLPFGs) with flexible transmission control capability. With novel spectral functionality of HLPFGs that can be varied by the torsional stress to the helix, and core mode blocking in a hollow core fiber, the proposed device showed unique BPF characteristics whose transmission can be flexible and altered along with a low polarization-dependent loss and low thermal variation, which have not observed in prior photorefractive grating devices.
    IEEE Photonics Technology Letters 02/2008; 20(2-20):153 - 155. DOI:10.1109/LPT.2007.912498 · 2.11 Impact Factor
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