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Few-mode Fibre

Few-mode Fibre

The FMF transmission system is based on mode division multiplexing (MDM), using the limited orthogonal modes in FMF as independent channels to transmit information, multiplying the transmission capacity of the system. The FMF uses different modes in the optical fibre as a new degree of freedom, successfully improving the system's spectrum efficiency. With a relatively large mode field area, the FMF offers very high nonlinear tolerance, improving the capacity of the optical transmission syst
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The YOFC FMF is manufactured using the PCVD process, featuring a complex optical fibre waveguide structure with excellent flexibility and control accuracy. On this basis, various core layer structures can be realized, such as step-index, and graded-index, along with the realization of an F-doped inner cladding or trench structure in the fibre cladding part. According to different designs, two-mode, four-mode, six-mode, and nine-mode FMFs, as well as ultra-low-loss (ULL) FMFs are available.

Applications

  • Mode division multiplexing (MDM)

  • Communication

  • Sensing

Characteristics

  • Properly controlled optical and geometrical indicators

  • Customized products with different waveguide structures according to customer needs

  • Excellent capability of suppressing bending loss in the case of small-radius bending

  • Lower differential mode group delay (DMGD) of graded-index FMF

  • Lower crosstalk of step-index FMF

Specifications

Two-mode fibre (graded-index)

Fibre typeFM SI-2
Part No.FM2010-A
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)20.0±0.3-
Cladding diameter (μm)125.0±0.5-
Cladding non-circularity (%)<0.7<>-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
Dispersion (ps/nm·km)LP01≤2321.2
LP11≤2320.5
Dispersion slope (ps/nm²·km)LP01≤0.110.098
LP11≤0.110.096
Effective area (μm²)LP01≥100112
LP11≥140152
Attenuation (dB/km)LP01≤0.210.19
LP11≤0.210.2
DMGD (ps/m)LP11-LP01- 0.3 ~ 0.3-0.14

Two-mode fibre (step-index)

Fibre typeFM SI-2
Part No.FM2010-B
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)14.0±0.5-
Core refractive index @1550 nm1.4485-
Cladding diameter (μm)125.0±0.7-
Cladding non-circularity (%)<0.7<>-
Coating diameter (μm)245.0±10.0-
Dispersion (ps/nm·km)LP01<22<>21
LP11<21<>19.5
Dispersion slope (ps/nm²·km)LP01<0.1<>0.08
LP11<0.1<>0.07
Effective area (μm²)LP01>100130
LP11>200220
Attenuation (dB/km)LP01<0.21<>0.19
LP11<0.21<>0.19
DMCD (ps/m)LP11-LP01<2.1<>1.9

ULL two-mode fibre (step-index)

Fibre typeFM SI-2-ULL
Part No.FM2010-C
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)16.0±0.2-
Cladding diameter (μm)125.0±1.0-
Cladding non-circularity (%)< 0.7-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
Dispersion (ps/nm·km)LP0121.0 ~ 23.022.53
LP1121.0 ~ 23.022.82
Dispersion slope (ps/nm²·km)LP010.08 ~ 0.110.1012
LP110.08 ~ 0.110.1011
Effective area (μm²)LP01150 ~ 200169
LP11150 ~ 200167
Attenuation (dB/km)LP01≤0.170.161
LP11≤0.170.161
DMCD (ps/m)LP11-LP01≤52.36

Four-mode fibre (graded-index)

Fibre typeFM GI-4
Part No.FM2011-A
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)23.0±0.3-
Cladding diameter (μm)125.0±0.5-
Cladding non-circularity (%)< 0.7-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
DispersionLP01≤23.021.4
LP11≤23.021.5
LP21≤23.021.6
LP02≤23.022
Dispersion slope (ps/(nm •km))LP01≤0.110.099
LP11≤0.110.1
LP21≤0.110.099
LP02≤0.110.1
Effective area (μm²)LP01≥100118
LP11≥140155
LP21≥200204
LP02≥200217
Attenuation (dB/km)LP01≤0.210.194
LP11≤0.210.191
LP21≤0.210.194
LP02≤0.210.194
DMGD (ps/m)LP11-LP01≤0.50.17
LP21-LP01≤0.50.3
LP02-LP01≤0.50.31

Four-mode fibre (step-index)

Fibre typeFM SI-4
Part No.FM2011-B
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)18.5±0.3-
Cladding diameter (μm)125±0.5-
Cladding non-circularity (%)< 0.7-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
DispersionLP01≤2321.9
LP11≤2322.5
LP21≤2322
LP02≤2321.8
Dispersion slope (ps/(nm² •km))LP01≤0.110.102
LP11≤0.110.104
LP21≤0.110.1
LP02≤0.110.095
Effective area (μm²)LP01≥160190
LP11≥160181
LP21≥160200
LP02≥160182
Attenuation (dB/km)LP01≤0.210.191
LP11≤0.210.189
LP21≤0.210.189
LP02≤0.210.189
DMGD (ps/m)LP11-LP01≤51.7
LP21-LP01≤53.61
LP02-LP01≤53.65

ULL four-mode fibre (step-index)

Fibre typeFM SI-4-ULL
Part No.FM2011-C
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)22.0±0.2-
Cladding diameter (μm)125.0±1.0-
Cladding non-circularity (%)< 0.7-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
Dispersion (ps/(nm•km))LP0121.0 ~ 25.022.51
LP1121.0 ~ 25.023.9
LP2121.0 ~ 25.024.74
LP0221.0 ~ 25.023.14
Dispersion slope (ps/(nm² •km))LP010.08 ~ 0.110.1015
LP110.08 ~ 0.110.1046
LP210.08 ~ 0.110.1033
LP020.08 ~ 0.110.1014
Effective area (μm²)LP01200 ~ 300269
LP11200 ~ 300254
LP21200 ~ 300277
LP02200 ~ 300244
Attenuation (dB/km)LP01≤0.170.161
LP11≤0.170.161
LP21≤0.170.163
LP02≤0.170.168
DMGD (ps/m)LP11-LP01≤52.08
LP21-LP01≤54.43
LP02-LP01≤54.63

Six-mode fibre (graded-index)

Fibre typeFM GI-6
Part No.FM2012-A
Optical characteristics @ 1,550 nmRangeTypical Value
Core diameter (μm)25.6±0.3-
Cladding diameter (μm)125.0±1.0-
Cladding non-circularity (%)< 0.7-
Operating wavelength (nm)1450 ~ 1700-
Coating diameter (μm)245.0±10.0-
Dispersion slope (ps/(nm •km))LP0120.0 ~ 22.021.31
LP1120.0 ~ 22.021.4
LP2120.0 ~ 22.021.28
LP0220.0 ~ 22.021.18
LP3120.0 ~ 22.021.32
LP1220.0 ~ 22.021.68
Dispersion slope (ps/(nm² .km))LP010.09 ~ 0.110.0988
LP110.09 ~ 0.110.0987
LP210.09 ~ 0.110.099
LP020.09 ~ 0.110.0981
LP310.09 ~ 0.110.1011
LP120.09 ~ 0.110.096
Effective area (μm²)LP01100 ~ 240123
LP11100 ~ 240162
LP21100 ~ 240217
LP02100 ~ 240203
LP31100 ~ 240225
LP12100 ~ 240235
Attenuation (dB/km)LP01≤0.220.207
LP11≤0.220.206
LP21≤0.220.208
LP02≤0.220.208
LP31≤0.220.21
LP12≤0.220.21
DMGD (ps/m)LPmn-LP01-0.2 ~ 0.20.13

Six-mode fibre (step-index)

Fibre typeFM SI-6
Part No.FM2012-B
Optical characteristics @ 1,550 nm　RangeTypical Value
Core diameter (μm)　16.0±0.2-
Cladding diameter (μm)　125.0±1.0-
Cladding non-circularity (%)　< 0.7-
Operating wavelength (nm)　1450 ~ 1700-
Coating diameter (μm)　245.0±10.0-
Dispersion slope (ps/(nm •km))LP0121 ~ 2421.85
LP1121 ~ 2422.63
LP2121 ~ 2422.83
LP0221 ~ 2423.71
LP3121 ~ 2422.71
LP1221 ~ 2422.89
Dispersion slope (ps/(nm² .km))LP010.08 ~ 0.110.1046
LP110.08 ~ 0.110.1038
LP210.08 ~ 0.110.0983
LP020.08 ~ 0.110.09
LP310.08 ~ 0.110.0821
LP120.08 ~ 0.110.0911
Effective area (μm²)LP01130 ~ 140134
LP11120 ~ 130125
LP21130 ~ 140135
LP02110 ~ 120119
LP31140 ~ 150145
LP12150 ~ 160153
Attenuation (dB/km)LP01≤0.220.201
LP11≤0.220.205
LP21≤0.220.21
LP02≤0.220.21
LP31≤0.220.215
LP12≤0.220.215
DMGD (ps/m)LP11-LP01≤54.4
LP21-LP01≤109.5
LP02-LP01≤109.52
LP31-LP01≤1514
LP12-LP01≤1210.04

Nine-mode fibre (graded-index)

Fibre typeFM GI-9
Part No.FM2013-A
Optical characteristics @ 1,550 nm　RangeTypical Value
Core diameter (μm)　33.0±0.3-
Cladding diameter (μm)　125.0±1.0-
Cladding non-circularity (%)　< 0.7-
Operating wavelength (nm)　1450~1700-
Coating diameter (μm)　245.0±10.0-
Dispersion (ps/(nm•km))LP0121.0 ~ 24.021.33
LP1121.0 ~ 24.021.39
LP2121.0 ~ 24.021.55
LP0221.0 ~ 24.021.31
LP3121.0 ~ 24.020.79
LP1221.0 ~ 24.021.05
LP4121.0 ~ 24.020.35
LP2221.0 ~ 24.022.4
LP0321.0 ~ 24.019.05
Dispersion slope (ps/(nm² .km))LP010.08 ~ 0.110.0989
LP110.08 ~ 0.110.0989
LP210.08 ~ 0.110.1011
LP020.08 ~ 0.110.0988
LP310.08 ~ 0.110.0966
LP120.08 ~ 0.110.0984
LP410.08 ~ 0.110.0925
LP220.08 ~ 0.110.101
LP030.08 ~ 0.110.0883
Effective area (μm²)LP01110 ~ 400149
LP11110 ~ 400196
LP21110 ~ 400240
LP02110 ~ 400254
LP31110 ~ 400290
LP12110 ~ 400302
LP41110 ~ 400331
LP22110 ~ 400392
LP03110 ~ 400276
Attenuation (dB/km)LP01≤0.220.201
LP11≤0.220.201
LP21≤0.220.203
LP02≤0.220.202
LP31≤0.220.203
LP12≤0.220.204
LP41≤0.220.204
LP22≤0.220.204
LP03≤0.220.204
DMGD (ps/m)LPmn-LP01-0.5~0.50.05