Multimode interference-based fiber-optic displacement sensor

Mehta, Alok; Mohammed, Waleed S.; Johnson, Eric

doi:10.1109/lpt.2003.815338

Cited by 221 publications

(108 citation statements)

References 3 publications

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“…Now, considering the single reimaging of the input field, it occurs at specific longitudinal locations within the MMF where r,z)=(r,0. This occurs at periodic longitudinal z locations (Mehta et al, 2003)    ,0 ,1 2 ,…”

Section: Multimode Interference Effectmentioning

confidence: 99%

“…Continuing with the analysis of this effect, the reimage that comes out of the MMF has been used in order to get an optical device (Soldano et al, 1992;Li et al, 2002;Selvas et al, 2005;Anzueto-Sanchez et al, 2006;Mehta et al, 2003). All these works used a high reflector mirror to get the light back into the MMF again as is showed in Fig 2. The analysis goes further because of the free space condition.…”

Section: Multimode Interference Effectmentioning

confidence: 99%

“…In other words, the length at which single images are formed can be obtained from the restricted symmetric interference condition which is given by (Selvas et al, 2005or Mehta et al, 2003 3 4 …”

Section: Multimode Interference Effectmentioning

confidence: 99%

See 2 more Smart Citations

Tunable Rare-Earth Doped Fiber Laser

Castillo-Guzman¹,

Selvas-Aguilar²

2012

Selected Topics on Optical Fiber Technology

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Section: Multimode Interference Effectmentioning

confidence: 99%

Section: Multimode Interference Effectmentioning

confidence: 99%

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Tunable Rare-Earth Doped Fiber Laser

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“…A modal propagation analysis (MPA) using cylindrical coordinates as in [7,8,12] LP modes can be excited because of the circular symmetry of the input field and assuming ideal alignment of the fibre axes of the SMF and the MMF [7,8,12]. Defining the field profile of…”

Section: Proposed Configuration and Its Designmentioning

confidence: 99%

“…a fiber lens, a displacement sensor, a refractometer, a bandpass filter and an edge filter [7][8][9][10][11]. Based on our previous investigation [11], this paper proposes and demonstrates a ratiometric wavelength monitor using two edge filters consisting of SMS fiber structures with opposite slope spectral responses.…”

Section: Introductionmentioning

confidence: 99%

Ratiometric wavelength monitor based on singlemode‐multimode‐singlemode fiber structure

Hatta

Farrell

Wang

et al. 2008

Micro & Optical Tech Letters

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An all-fiber ratiometric wavelength monitor for optical wavelength measurement is proposed and is investigated theoretically and experimentally. Two edge filters with opposite slope spectral responses based on singlemode-multimode-singlemode (SMS) fiber structures are developed. A ratiometric wavelength measurement system employing the developed SMS edge filters demonstrates a high discrimination range of 20.41 dB and a potential wavelength measurement resolution of 10 pm over a wavelength range from 1530 to 1560 nm. IntroductionA wavelength monitor is a key component for many optical systems such as multi-channel dense wavelength-division multiplexing (DWDM) optical communication systems and fibre Bragg grating (FBG) based optical sensing systems. A FBG-based optical sensing system requires a wavelength demodulation system capable of accurately estimating the wavelength shift in the reflected light from an FBG element induced by strain or temperature changes.Wavelength measurement or monitoring can be implemented using a ratiometric power measurement technique. A ratiometric wavelength monitor usually consists of a splitter with two outputs to which are attached an edge filter arm with a well defined spectral response and a reference arm. Alternatively, two edge filters arms with opposite slope spectral responses can be used. The use of two opposite slope edge filters can increase resolution of the ratiometric system [1]. Such a ratiometric wavelength monitor scheme converts the wavelength measurement into a signal intensity measurement. Compared with a wavelength-scanning-based active measurement scheme, it has the advantages of a simple configuration, the potential for high-speed measurement and the absence of mechanical movement. The main element of the ratiometric scheme, the edge filter, can be implemented by either a bulk thin filter [1], a fiber grating [2], biconical fiber couplers [3], or a bending fiber [4,5]. An all-fiber edge filter has several advantages by comparison to bulk filters, for example, ease of interconnection, mechanical stability and low polarization sensitivity [6].Singlemode-multimode and singlemode-multimode-singlemode (SMS) fiber structures have been investigated for use in several applications e.g. a fiber lens, a displacement sensor, a refractometer, a bandpass filter and an edge filter [7][8][9][10][11]. Based on our previous investigation [11], this paper proposes and demonstrates a ratiometric wavelength monitor using two edge filters consisting of SMS fiber structures with opposite slope spectral responses. This configuration has the advantage that it can achieve opposite slope spectral responses with a high

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Multimode‐fiber‐based edge filter for optical wavelength measurement application and its design

Wang

Farrell

2006

Micro & Optical Tech Letters

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the delay required to place the required output packet at the start of the train). This concept is illustrated in Figure 7.In summary, it was shown that time-slot interchange is possible using the CrossPoint switch by implementing delay lines. Arbitrary time-slot permutations can be achieved by scaling (or cascading) CrossPoints, and the TSI application can be simplified using the CrossPoint because multiple recirculations through a single switch fabric is possible due to the very low crosstalk of the switch. A maximum switch size of N ϩ 1 is required, with the maximum number of FDLs required being N.

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Multimode interference-based fiber-optic displacement sensor

Cited by 221 publications

References 3 publications

Tunable Rare-Earth Doped Fiber Laser

Tunable Rare-Earth Doped Fiber Laser

Ratiometric wavelength monitor based on singlemode‐multimode‐singlemode fiber structure

Multimode‐fiber‐based edge filter for optical wavelength measurement application and its design

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