Double-pass acoustooptic tunable bandpass filter with zero frequency shift and reduced polarization sensitivity

Satorius, D.A.; Dimmick, T.E.; Burdge, Geoffrey L.

doi:10.1109/lpt.2002.801111

Cited by 19 publications

(16 citation statements)

References 8 publications

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“…From this result we emphasize the low insertion loss of  1 dB and the easy implementation of the CMB. If we compare these results with similar reported schemes of AOTBFs [8][9][10][11], we can appreciate the improvement achieved with the present scheme.…”

Section: The Ao Tunable Bandpass Filtersupporting

confidence: 66%

“…Under this configuration the device operates as a bandpass filter, and the light whose wavelength does not fulfill the phase-matching condition is strongly attenuated. All-fiber AO tunable bandpass filters (AOTBFs) based on this mechanism have been proposed and demonstrated in which the obstacle is composed of a core mode blocker (CMB) [5,[8][9][10][11]. CMBs have been fabricated by core damage [8,9], specially designed hollow optical fibers [10], and ultraviolet (UV)-induced effect [11].…”

mentioning

confidence: 99%

“…All-fiber AO tunable bandpass filters (AOTBFs) based on this mechanism have been proposed and demonstrated in which the obstacle is composed of a core mode blocker (CMB) [5,[8][9][10][11]. CMBs have been fabricated by core damage [8,9], specially designed hollow optical fibers [10], and ultraviolet (UV)-induced effect [11]. From these devices, a maximum suppression for the non-resonant modes of 35 dB can be achieved with a CMB made of local damage in the core [8], and a minimum insertion loss of 1 dB in a bandpass configuration based on UV-induced CMB [11].…”

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confidence: 99%

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Improved All-Fiber Acousto-Optic Tunable Bandpass Filter

Ramírez-Meléndez

Bello-Jiménez

Pottiez

et al. 2017

IEEE Photon. Technol. Lett.

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Abstract-An all-fiber acousto-optic tunable bandpass filter based on a 1.185-mm long coreless core mode blocker is reported. Experimental results demonstrate a minimal insertion loss of 1.2 dB at the optical resonant wavelength of 1527.7 nm with 3-dB optical bandwidth of 0.83 nm. The optimization of the device takes into account the attenuation of the acoustic wave and leads to an asymmetric configuration in which the coupling section is shorter than the recoupling part. Under the effect of a standing flexural wave the device can be operated as a bandpass modulator. The device exhibits a maximum modulation depth of 28 %, 4 dB of insertion loss and 0.97 nm of optical bandwidth at 4.774 MHz.Index Terms-Acousto-optic filters, acousto-optic modulation, bandpass filters.

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Section: The Ao Tunable Bandpass Filtersupporting

confidence: 66%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Improved All-Fiber Acousto-Optic Tunable Bandpass Filter

Ramírez-Meléndez

Bello-Jiménez

Pottiez

et al. 2017

IEEE Photon. Technol. Lett.

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“…In torsional AOTFs, the polarization mode at its resonance can be either rejected or selected by adjusting the output polarizer angle, so that the filtering type can be readily switched between notch and band-pass types in a single device configuration. In flexural AOTFs, however, it is challenging to implement both filtering types into a single configuration because additional inflexible constituents assisting AO mode coupling -such as core mode blockers inscribed in fibers [8] or a Sagnac loop with spatial mode selective couplers [9] -should be built in the filters for band-pass filtering, while notch type filtering requires only a single fiber strand for AO coupling. In general, fabrication of these additional constituents requires time-consuming and delicate post-processing of the fiber, and thus imposes a limit on practicality and mass-productivity of the devices.…”

Section: Introductionmentioning

confidence: 99%

Band-rejection filtering based on lossy torsional acousto-optic coupling in a single polarization fiber

Song¹,

Lee²,

Kim³

2014

Opt. Express

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We propose and demonstrate novel band-rejection filtering scheme based on lossy torsional acousto-optic (AO) coupling in a single polarization fiber. Simulation results show that the polarization insensitive notch depth of -30 dB is achievable for a 2-m-long fiber in the state-of-the-art fiber manufacturing technology. More efficient band-rejection in excess of -44 dB could be also feasible in practical fiber length. Good agreement between our numerical simulations and proof-of-principle experiments is obtained in optical communication C-band. The measured notch depth is -29.4 dB for a low loss polarization mode after propagating an AO interaction length of 49.8 cm. The filtered wavelength could be tuned linearly by the variable acoustic transducer frequency with the slope of 0.61 nm/kHz, and the polarization dependence of notch depth was measured to 0.8 dB in our setup. Our experiments confirm the validity and practicality of the approach, and illustrate the in-fiber torsional AO band-rejection filter with simpler device configuration is achievable.

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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.…”

Section: Introductionmentioning

confidence: 99%

Single-Multi-Single Mode Structure Based Band Pass/Stop Fiber Optic Filter With Tunable Bandwidth

Tripathi

Kumar

Marin

et al. 2010

J. Lightwave Technol.

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Abstract-We present a simple, efficient and easy to fabricate single-multi-single mode (SMS) fiber-based tunable bandwidth optical 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. Index Terms-Band pass filter, modal interference, optical fiber components, wavelength filter.

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Double-pass acoustooptic tunable bandpass filter with zero frequency shift and reduced polarization sensitivity

Cited by 19 publications

References 8 publications

Improved All-Fiber Acousto-Optic Tunable Bandpass Filter

Improved All-Fiber Acousto-Optic Tunable Bandpass Filter

Band-rejection filtering based on lossy torsional acousto-optic coupling in a single polarization fiber

Single-Multi-Single Mode Structure Based Band Pass/Stop Fiber Optic Filter With Tunable Bandwidth

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