Reduction of Intensity Noise in Hollow Core Optical Fiber Using Angle-Cleaved Splices

Miller, Gary A.; Cranch, Geoffrey A.

doi:10.1109/lpt.2015.2496873

Cited by 13 publications

(4 citation statements)

References 15 publications

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“…The main drawback of this approach so far is in the relatively high level of IL > 3 dB [6] when 19-cell HC-PBGF was used (although an excellent -60 dB level of back-reflection was achieved). With further refinement a reduced IL of 1-2 dB with a slight compromise in back-reflection (-50 dB) was reported [7]. The main challenges of this approach are the difficulty in reliably achieving accurate angle cleaves on such delicate structures and the high sensitivity of the IL to the cleave quality.…”

Section: Introductionmentioning

confidence: 99%

Low-Loss and Low-Back-Reflection Hollow-Core to Standard Fiber Interconnection

Komanec

Suslov

Zvánovec

et al. 2019

IEEE Photon. Technol. Lett.

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We present a new approach to permanently interconnect hollow-core fiber (HCF) to solid-core fiber, which does not involve fusion splicing. Our approach is based on a modification of the glue-based fiber-array technology routinely used for fiber pigtailing of planar lightwave circuits. The resulting interconnection provides for a low insertion loss due to the fact that the HCF microstructure is not deformed during the gluing (low temperature) process that is almost impossible to achieve with the standard (high temperature) fusion splicing method. Furthermore, this low temperature technique enables the deposition and preservation of thin films deposited at the solid-to-hollow core fiber interface, allowing for additional functionality without the introduction of extra losses or any increase in complexity. To demonstrate this, we have applied an anti-reflection (AR) coating. A further feature of our approach is the ability to control very precisely the length of the graded-index (GRIN) fiber mode field (MF) adapter inserted in between the standard singlemode fiber (SMF-28) and the HCF. We show experimentally how the length of the GRIN fiber MF adapter influences the coupling between the SMF-28 and the fundamental as well as higher-order modes of the HCF. We coupled between SMF-28 (10 µm Mode Field Diameter, MFD) and the fundamental mode of a 19-cell hollow-core photonic bandgap fiber (HC-PBGF, 21.1 µm MFD) with the lowest-ever reported insertion loss of 0.30 dB per interface.

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Section: Introductionmentioning

confidence: 99%

Low-Loss and Low-Back-Reflection Hollow-Core to Standard Fiber Interconnection

Komanec

Suslov

Zvánovec

et al. 2019

IEEE Photon. Technol. Lett.

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“…When ARF is spliced to a solid core fiber, the high-order mode will excite the fiber to produce intermodal interference, resulting in excessive intensity fluctuation noise at the fiber output [19]. Because the coherence length of the light source is inversely propor-tional to the bandwidth, it is possible to reduce the intensity fluctuation noise caused by intermodal interference effectively by enlarging the bandwidth of the light source.…”

Section: Introductionmentioning

confidence: 99%

Weak Faraday Effect Measurement in Anti-Resonant Fiber Based on Intermodal Interference Suppression

Guo,

Du,

Lin

et al. 2024

Photonics

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Anti-resonant fiber (ARF) works well in a relatively strong magnetic field due to its weak Faraday effect, which results from the fundamental mode mainly transmitting in the air core. Accurately measuring the Faraday effect strength, i.e., the effective Verdet constant, of an ARF determines its applicable scenarios. However, the effective Verdet constant of ARF is ~3 orders of magnitude lower than that of a standard single-mode fiber, which is very difficult to measure. In this paper, we reveal that intermodal interference is the main obstacle to measuring the ultralow effective Verdet constant of ARF and propose using a narrow-band low-coherence light to suppress it. The measured effective Verdet constant of ARF is 0.423 ± 0.005 mrad/T/m at 1550 nm.

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“…The Fresnel back-reflection can be suppressed by SSMF tapering [18], [20], deposition of anti-reflective (AR) coating [13], [21] and angle-cleaving [22]- [24]. Back-reflection suppression to -27 dB over 390 nm bandwidth (from 1260 nm to 1650 nm) was demonstrated through tapering [18], below -40 dB over 60 nm using AR coating [13], and below -40 dB using 2 • angled interface [24].…”

Section: Introductionmentioning

confidence: 99%

Connecting Hollow-Core and Standard Single-Mode Fibers With Perfect Mode-Field Size Adaptation

Zhong,

Fokoua,

Ding

et al. 2024

J. Lightwave Technol.

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We propose an approach to interconnect a hollowcore fiber (HCF) of arbitrary core size with standard single-mode fiber with perfect mode-field size adaptation and experimentally achieve for the first time insertion loss agreeing with that predicted by simulations. We demonstrate this using three lowloss HCFs, including 1 st window nested antiresonant nodeless fiber (NANF), 2 nd window NANF and the state-of-the-art double NANF (DNANF). The connection with a minimum achieved insertion loss of 0.079 dB was permanently secured via gluing and did not degrade during 4 weeks of continuous measurement. To the best of our knowledge, this is the lowest reported value and is comparable to or lower than the connection between dissimilar single-mode fibers (e.g., standard single-mode fiber and dispersion-compensating fiber). We also show that such connection leads to excellent suppression of higher-order modes coupling, of importance to all applications sensitive to multipath interference. Importantly, obtaining agreement between simulations and experiments validates for the first time the accuracy of the simulations and opens the door to further optimization via simulations with the ability to subsequently achieve the same result experimentally.

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Reduction of Intensity Noise in Hollow Core Optical Fiber Using Angle-Cleaved Splices

Cited by 13 publications

References 15 publications

Low-Loss and Low-Back-Reflection Hollow-Core to Standard Fiber Interconnection

Low-Loss and Low-Back-Reflection Hollow-Core to Standard Fiber Interconnection

Weak Faraday Effect Measurement in Anti-Resonant Fiber Based on Intermodal Interference Suppression

Connecting Hollow-Core and Standard Single-Mode Fibers With Perfect Mode-Field Size Adaptation

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