Fiber cavity ring down and gain amplification effect

Silva, Susana; Magalhães, Regina; Pérez-Herrera, Rosa Ana; Lopez-Amo, M.; Marques, M. B.; Frazão, Orlando

doi:10.1007/s13320-016-0309-9

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…This will translate to a very small cavity length which leads to high radiation loss and low-quality factor [18][19][20]. The use of a gain medium before the lasing threshold to enhance the quality factor has also been explored [21][22][23]. Yet, the gain medium introduces spontaneous emission noise and complexity into the whole system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Selim,

Anwar

2023

J. Opt.

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In this study, we investigate a novel design of an on-chip nested coupled ring resonator to enhance the quality factor and the effective length of the resonator. The configuration consists of an open ring and racetrack resonator, with lengths of 340 μm and 184.4 μm, respectively, with a coupling ratio of 97/3. In this regard, the proposed nested cavity has been experimentally characterized and compared with a single cavity ring resonator. Our results show a significant improvement in the quality factor by a factor of four. This improvement in performance opens up exciting new possibilities for state-of-the-art applications, such as compact optical sensors and delay lines. Our proposed design represents a significant advancement in the field of integrated optics, and we believe that it has the potential to enable a broad range of applications in the future.

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Section: Introductionmentioning

confidence: 99%

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Selim,

Anwar

2023

J. Opt.

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“…The inherent loss of the cavity itself due to high losses of the passive devices is a major limitation for CRD systems. In order to overcome this drawback, two new configurations (insertion of an optical amplifier in the cavity [14] and a simplified linear cavity using a single fibre coupler together with two mirrors [15]) have been recently studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a novel sensor interrogation technique based on fiber cavity ring-down (CRD) loop and OTDR

Yüksel

Yilmaz

2018

Optical Fiber Technology

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We present the analysis of a remote sensor based on fiber Cavity Ring-Down (CRD) loop interrogated by an Optical Time Domain Reflectometer (OTDR) taking into account both practical limitations and the related signal processing. A commercial OTDR is used for both pulse generation and sensor output detection. This allows obtaining a compact and simple design for intensity-based sensor applications. This novel sensor interrogation approach is experimentally demonstrated by placing a variable attenuator inside the fiber loop that mimics a sensor head.

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“…Recently, a fiber-based CRD technique that used a large core multimode fiber-cavity design based on highly reflective gold coatings was demonstrated [5]. Recently, it is demonstrated the effect of using an EDFA for signal amplification inside the fiber ring of a cavity ring-down configuration [6].…”

Section: Introductionmentioning

confidence: 99%

Multimode interference-based fiber sensor in a cavity ring-down system for refractive index measurement

Silva

Frazão

2017

Optics & Laser Technology

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This work reports a multimode interference-based fiber sensor in a cavity ring-down system (CRD) for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it is placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parametera sensitivity of −1.6×10 −9 μs/°C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 μs/RIU in the RI range of 1.324-1.331 was obtained. The use of a MMI fiber sensor in the proposed CRD configuration allowed achieving a sensitivity ∼4-fold than that obtained with a tilted fiber Bragg grating and ∼2-fold than that when a micrometric channel inscribed in the fiber was used.

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Fiber cavity ring down and gain amplification effect

Cited by 10 publications

References 15 publications

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

Analysis of a novel sensor interrogation technique based on fiber cavity ring-down (CRD) loop and OTDR

Multimode interference-based fiber sensor in a cavity ring-down system for refractive index measurement

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