New method for calculating the coupling coefficient in graded index optical fibers

Savović, Svetislav; Djordjevich, Alexandar

doi:10.1016/j.optlastec.2017.11.026

Cited by 14 publications

(9 citation statements)

References 18 publications

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“…Consequently, the modal dispersion increases which limits the B × L product 30 . Furthermore, the coupling coefficient D can be determined by using the following expression: 31

D = \frac{σ_{z_{2}}^{2} - σ_{z_{1}}^{2}}{2 (Z_{2} - Z_{1})},

where

σ_{z_{1}}

and

σ_{z_{2}}

are variances of the output modal power distribution measured at the GI‐MMF lengths Z 1 and Z 2 , respectively, where Z 2 > Z 1 . By using two standard deviation values equal to

σ_{z_{2}} = 5

and

σ_{z_{1}} = 2

, which are calculated experimentally at MMF lengths z = 0 and z = 1 km , respectively, 31 the value of the coupling coefficient is around 10.5 km −1 .…”

Section: Resultsmentioning

confidence: 99%

A full‐duplex ultra‐wideband over multimode fiber link for internet of things based smart home applications

Mirza

Ghafoor

Hussain

2020

Trans Emerging Tel Tech

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We propose a bidirectional ultra-wideband (UWB) over multi-mode fiber link for internet of things based smart home applications that is compatible with globally emerging green radio trend. Employing direct modulation and coupled with carrier-reuse makes the proposed architecture cost efficient. UWB signals are all-optically generated by converting phase modulation to intensity modulation by using a shaping filter that has a Gaussian profile. Bidirectional data at the rate of 2 Gbps is transmitted while achieving low receiver sensitivities.

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“…Consequently, the modal dispersion increases which limits the B × L product 30 . Furthermore, the coupling coefficient D can be determined by using the following expression: 31

D = \frac{σ_{z_{2}}^{2} - σ_{z_{1}}^{2}}{2 (Z_{2} - Z_{1})},

where

σ_{z_{1}}

and

σ_{z_{2}}

are variances of the output modal power distribution measured at the GI‐MMF lengths Z 1 and Z 2 , respectively, where Z 2 > Z 1 . By using two standard deviation values equal to

σ_{z_{2}} = 5

and

σ_{z_{1}} = 2

, which are calculated experimentally at MMF lengths z = 0 and z = 1 km , respectively, 31 the value of the coupling coefficient is around 10.5 km −1 .…”

Section: Resultsmentioning

confidence: 99%

A full‐duplex ultra‐wideband over multimode fiber link for internet of things based smart home applications

Mirza

Ghafoor

Hussain

2020

Trans Emerging Tel Tech

View full text Add to dashboard Cite

show abstract

“…The optimum value of the core index exponent g to obtain maximum bandwidth depends on the wavelength λ (in free-space) of the source [12]. Time-independent power flow equation for GI optical fiber is [13][14][15]:…”

Section: Time-independent Power Flow Equation For Gi Optical Fibermentioning

confidence: 99%

“…where P(m,λ,z) is power in the m-th principal mode (modal group), z is the coordinate along the fiber axis from the input fiber end, D is a constant mode coupling coefficient [15]. The maximum principal mode number M(λ) can be obtained as [13,14]:…”

Section: Time-independent Power Flow Equation For Gi Optical Fibermentioning

confidence: 99%

Spatial division multiplexing in nine-core graded index plastic optical fibers

Savović¹,

Djordjevich²,

Simović³

et al. 2020

Laser Phys.

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We propose a spatial division multiplexing in a new designed multimode multicore graded index plastic optical fiber with nine cores arranged in an octagonal array. The influence of mode coupling on two-channel spatial division multiplexing capability in each of nine cores is investigated by solving the power flow equation. Our numerical results show that mode coupling significantly limits the fiber length at which the spatial division multiplexing can be realized in each of nine cores with a minimal crosstalk between two neighbor spatial optical channels. Two spatial channels in the proposed nine-core graded index plastic optical fiber can be employed with a minimal crosstalk up to the fiber length of 5 m, which is about 18% of the coupling length (fiber length where equilibrium mode distribution is achieved). Such characterization of multicore graded index plastic optical fibers should be considered in designing a multicore optical fiber transmission system for space division multiplexing.

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“…The optimum value of the core index exponent g to obtain maximum bandwidth depends on the wavelength λ (in free-space) of the source [13]. Time-independent power flow equation for GI optical fiber is [14][15][16]:…”

Section: Time-independent Power Flow Equation For Gi Optical Fibermentioning

confidence: 99%

Influence of mode coupling on three spatially multiplexed channels in multimode graded index plastic optical fibers

et al. 2020

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The influence of mode coupling on three-channel spatial division multiplexing capability in multimode graded index plastic optical fibers is investigated by solving the power flow equation. Our numerical results show that mode coupling significantly limits the fiber length at which the spatial division multiplexing can be realized with a minimal crosstalk between three neighbor spatial optical channels. Three spatial channels in the multimode graded index plastic optical fiber can be employed with a minimal crosstalk up to the fiber length of 3.5 m, which is about 12.5% of the coupling length (fiber length where equilibrium mode distribution is achieved). Such characterization of multimode graded index plastic optical fibers should be considered in designing an optical fiber transmission system for space division multiplexing, particularly for small office networking.

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New method for calculating the coupling coefficient in graded index optical fibers

Cited by 14 publications

References 18 publications

A full‐duplex ultra‐wideband over multimode fiber link for internet of things based smart home applications

A full‐duplex ultra‐wideband over multimode fiber link for internet of things based smart home applications

Spatial division multiplexing in nine-core graded index plastic optical fibers

Influence of mode coupling on three spatially multiplexed channels in multimode graded index plastic optical fibers

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