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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    • "Only one carries the downstream data, while the other ones are unmodulated. At the base station (BS), mm-waves at 20 GHz, 40 GHz and 60 GHz are obtained via two tunable fiber Bragg gratings (FBGs) [19] [20] [21] and a PD for wireless access. One of these three unmodulated sidebands can be used as the uplink optical carrier for uplink. "
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    ABSTRACT: In this paper, we have reported a radio-over-fiber (RoF) link with a single sideband (SSB) optical millimeter (mm)-wave signal to support the 20 GHz, 40 GHz and 60 GHz mm-wave multiband wireless accesses, based on the optical carrier suppression (OCS) modulation via a nested Mach-Zehnder modulator (MZM). The downstream data is only modulated on one of the multiple tones of the optical signal. At the base station (BS), according to the requirement of the wireless users, the multitone optical signal can be decomposed as different SSB optical signals using tunable fiber Bragg gratings (FBGs). Each SSB optical signal consists of two tones: the data-bearing optical tone and a referenced optical local oscillator to convert the baseband optical signal to the electrical mm-wave one based on heterodyne beating. The simulation results reveal that our proposed scheme can provide multiband wireless accesses and without dispersion compensation after 30 km single-mode fiber (SMF), the 10 Gb/s 4-QAM downstream data on the three-band mm-waves have minor degradation.
    Full-text · Article · Nov 2015 · Optical Switching and Networking
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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.
    Full-text · Article · Dec 2010 · Journal of Lightwave Technology
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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.
    Full-text · Article · Apr 2008 · IEEE Photonics Technology Letters
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