5Tb/s transmission over 2.2 km of multimode OM2 fiber with direct detection thanks to wavelength and mode group multiplexing

IEEE Photon. Technol. Lett.

Lillieholm

et al. 2020

Section: Introductionmentioning

confidence: 99%

Modeling of MIMO Less Mode Division Multiplexed Systems

IEEE Photon. Technol. Lett.

Lillieholm

et al. 2020

“…Another way to mitigate the modal interference is by using different wavelengths for the two modes, so that the wavelength spacing is large enough that the modal beat frequency becomes much larger than the detector bandwidth. This kind of wavelength interleaved FMF transmissions has already been reported [30,31]. For 10 Gb/s modulation rate, a wavelength spacing of 0.2 nm is enough to mitigate the modal interference [28].…”

Section: Mdm Transmission Using Two Lasersmentioning

confidence: 73%

Air-clad photonic lanterns: fabrication and applications

Lillieholm

et al. 2022

J. Opt.

The fabrication steps for an air-clad photonic lantern that can excite the first two LP mode groups in a multimode fiber are presented in this paper. A multiplexing crosstalk below -16.8 dB is measured on the fabricated lantern using S2 imaging technique over a wavelength of 1525 nm to 1575 nm. The de-multiplexing crosstalk is measured for both LP01 and LP11 mode groups as -16.8 dB and -9.4 dB respectively using loss measurements. 2× 40 Gb/s MIMO-less MDM transmission through 7 m of two mode step index fiber is demonstrated using the fabricated photonic lanterns. 2×10 Gb/s MIMO-less MDM transmission through 1.6 km standard 50/125 μm multimode fiber is also demonstrated and a Q value higher than 3.7 is obtained for both spatial channels over all input polarizations. Simple intensity modulation and direct detection schemes are used for these MDM transmissions.

“…Another way to mitigate this modal interference is by using different wavelengths for the two modes, where the wavelength spacing is large enough that the beat frequency becomes much larger than the detector bandwidth. This kind of wavelength interleaving to mitigate modal crosstalk in FMF transmssions has already been reported [2] [12] [13]. In the next section we include an experimental study of these modal interference effects on FMF transmission.…”

Section: Mdm Transmissionmentioning

confidence: 82%

MDM Transmission Using Air-Clad Photonic Lanterns

IEEE Photon. Technol. Lett.

Galili

et al. 2020

MIMO less few mode transmission is performed using two spatial channels transmitted through 1 km of two mode graded index fiber at 10 Gb/s modulation rate. The multiplexing and de-multiplexing of the spatial channels are done using air clad photonic lanterns. The power in the two degenerate LP11 modes are added electrically and counted as a single channel. The Q values calculated for the LP01 and LP11 channels are 5.4 and 4.7 respectively. We also show that, the signal degradation due to modal interference can be mitigated by using different laser sources for different spatial channels with some wavelength spacing. The wavelength separation increases the modal beat frequency beyond the detector bandwidth, thus improving the transmission performance. Using two laser sources with a wavelength spacing of 0.2 nm between the spatial modes could improve the Q compared to the case where a single laser source is split between the spatial channels with some extra length of fiber in one of the paths for optical decorrelation.