Analysis of four-port optical fiber ring and loop resonators using a 3*3 fiber coupler and degenerate two-wave mixing

Ja, Y. H.

doi:10.1109/3.166469

Cited by 24 publications

(6 citation statements)

References 9 publications

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“…The finesse in (5), therefore increases monotonically with . Hence, the maximum finesse that is obtainable is given by (9) where , obtained by setting and in (2). We show in Fig.…”

Section: Discussionmentioning

confidence: 98%

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An optical filter of adjustable finesse using an amplified fiber ring resonator

Chew

Tjhung

Mendis

1997

J. Lightwave Technol.

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We consider an optical filter constructed from a simple ring resonator with two electro-optical directional couplers and a fiber amplifier in the ring. By adjusting the coupling coefficient of the electro-optical directional couplers, the finesse of this optical filter can be controlled over a specified range. The variation in the insertion loss of the optical filter can be overcome by adjusting the gain of the fiber amplifier simultaneously. This paper analyzes theoretically the performance of the optical filter, as a function of the coupling coefficient of the electro-optical directional coupler and the gain of the fiber amplifier. We also show that it is possible to design an optical filter of wide adjustable finesse by changing only the coupling coefficient of the electro-optical directional couplers, leaving the gain of the fiber amplifier unchanged. This simpler method results only in a slight change in the insertion loss if an appropriate condition is chosen. The filter will be useful in coherent optical systems, where the bandwidth of the optical filter needs to be appropriately adjusted under varying biasing and signaling conditions, or as an optical discriminator with an adjustable Q-factor.

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“…The finesse in (5), therefore increases monotonically with . Hence, the maximum finesse that is obtainable is given by (9) where , obtained by setting and in (2). We show in Fig.…”

Section: Discussionmentioning

confidence: 98%

“…1(a). The fiber that connects the output of the first directional coupler and the input of the second directional coupler is a rare-earth-doped fiber, with an electronically controlled optical intensity gain [9]. The transmission characteristic of the ring resonator can be written as where…”

Section: Discussionmentioning

confidence: 99%

An optical filter of adjustable finesse using an amplified fiber ring resonator

Chew

Tjhung

Mendis

1997

J. Lightwave Technol.

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“…As the output of a 3 × 3 coupler,

and

can be written as [ 24 ]:

where

is the phase difference induced by the dynamic event between the sensing and reference arms of the interferometer, and C and B are constants depending on the coupling coefficient of the 3 × 3 coupler.…”

Section: The Coherent Fiber Optic Sensormentioning

confidence: 99%

“…The 3 × 3 coupler performs a passive stable homodyne demodulation where the output signals are 120 • phase shifted and the corresponding receiver photo-currents I 1 and I 2 as depicted in the schematic of Figure 1. As the output of a 3 × 3 coupler, I 1 and I 2 can be written as [24]:…”

Section: The Coherent Fiber Optic Sensormentioning

confidence: 99%

Coherent Fiber-Optic Sensor for Ultra-Acoustic Crack Emissions

Luch

Ferrario²,

Fumagalli

et al. 2021

Sensors

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A coherent optical fiber sensor with adequate sensitivity for detecting the acoustic emission (AE) during the propagation of a crack in a ferrous material is presented. The proposed fiber optic sensor is successfully compared in terms of the SNR (Signal to Noise Ratio) and detectable AE energy levels to commercially available AE piezo-transducers sensors and is proven to be an effective and advantageous alternative for sensing and monitoring fatigue damage in structural applications.

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“…In recent years optical fiber couplers, such as 2 × 2 and 3 × 3 optical single-mode fiber couplers, with ring or loop configurations have attracted much attention [1][2][3][4][5]. The fiber ring laser using an erbium-doped-fiber amplifier (EDFA) can be designed as a multimode, single-mode, or pulsed operation [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multiple-Output Fiber-Ring Lasers and Amplifiers in a Hybrid CATV and ADSL Broadcasting Optical Fiber Communication System

Lin

Kuo

2003

Fiber and Integrated Optics

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In this article we propose two kinds of new fiber ring structure with a semiconductor optical amplifier. The first structure is a one-fiber-ring amplifier with an 8 × 8 fiber coupler and a semiconductor optical amplifier (SOA). The second fiber ring structure is a two-fiber-ring laser including an 8 × 8 fiber coupler, a 2 × 2 E/O modulator, and an SOA. The 14-output spectra of the fiber laser are measured. The gain coefficients of each port of the multiple-output-fiber-ring amplifiers are also measured. We apply these two kinds of fiber ring structures in a hybrid CATV and ADSL broadcasting optical fiber communication system. This application can develop a broadcasting system with large coverage area without using many laser diodes and optical amplifiers. The performance of such a system is also analyzed in this article.

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Analysis of four-port optical fiber ring and loop resonators using a 3*3 fiber coupler and degenerate two-wave mixing

Cited by 24 publications

References 9 publications

An optical filter of adjustable finesse using an amplified fiber ring resonator

An optical filter of adjustable finesse using an amplified fiber ring resonator

Coherent Fiber-Optic Sensor for Ultra-Acoustic Crack Emissions

Multiple-Output Fiber-Ring Lasers and Amplifiers in a Hybrid CATV and ADSL Broadcasting Optical Fiber Communication System

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