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We demonstrate an IQ modulator by employing two monolithic injection-locked VCSELs which are driven to produce pure amplitude modulation. QPSK signals are produced at 10 GBaud with a peak-to-peak modulation voltage of 600 mV.
We demonstrate amplification in a multimode cladding-pumped fiber amplifier supporting 36 spatial modes. Using a large core EDF, we obtain <0.5dB differential modal gain, 16dB gain, and 25dBm output power across the C-band.
We report about mode-multiplexed transmission over multimode fiber with 10 spatial modes. In particular we describe the latest progress in transmission experiments, mode-multiplexers, optical amplifiers and wavelength selective switches.
We report transmission experiments in novel fibers that can provide at least one order of magnitude higher capacity than single-mode fibers. The fiber considered are multimode and multicore fibers.
We demonstrate combined wavelength- and mode-multiplexed transmission with a spectral efficiency of 58 b/s/Hz over an 87-km single-span multi-mode fiber using 16-QAM modulation format. The hybrid fiber span comprises 10- and 15-mode fibers.
We report about mode-multiplexed transmission over few-mode fibers with 10 or more spatial modes. We also describe the latest progress in mode-multiplexers and optical amplifiers.
We demonstrate combined wavelength- and mode-multiplexed transmission over a 125-km multimode single span composed of 10- and 15-mode fibers with a spectral efficiency of 29 b/s/Hz. A transmission capacity of 115.2 Tb/s is achieved over a distance of 87 km.
We demonstrate bidirectional pumped Raman amplification and 1050 km combined WD-M/SDM transmission in a 3-spatial-mode few-mode fiber with a 70-km zero-net-gain fiber span.
We demonstrate mode-multiplexed transmission over all-fiber optically amplified spans of 215 km and 179 km for 3 and 6 spatial modes, respectively. The spans were amplified using two cladding-pumped few-mode fiber amplifiers.
We fabricate ten- and fifteen-mode photonic lanterns by using microstructured preforms that enables a repeatable fabrication process and scalability to large number of modes. Mode selective capability is demonstrated by independently exciting individual LP mode.
We demonstrate a six spatial-mode, wavelength-routing network interoperable with few-mode, coupled-multi-core, and single-mode fiber spans using a custom 57-port wavelength-selective switch configured for joint-switching of spatial-superchannels.
We review the measurements of inter-modal nonlinear effects performed on a 4.7-km few-mode fiber where both inter-modal cross-phase modulation and inter-modal four-wave mixing were observed.
We demonstrate the transmission of 12 spatial and polarization modes multiplexed on 255 optical channels in ultra-dense WDM using OFDM across the full C-band over 74.17 km 6-mode fiber. An aggregate bit rate of 41.6 Tbit/s is achieved.
We present experimental transmission results for a novel 6-core coupled-core fibre with 125 μm cladding diameter. We transmit combined 2-polarization, 6-SDM and 30-WDM channels over a distance of 1705 km, with a spectral-efficiency-distance product of 30690 bit/s/Hz km.
We present experimental results for mode-multiplexed WDM transmission over OM3 multimode fibres. We transmit 60 WDM channels and 3 spatial modes over a distance of 305 km. We use mode-selective photonic lanterns as mode couplers and for differential group delay compensation.
We report transmission experiments in few-mode fibers supporting 6 spatialand polarization modes, where low-loss photonic lanterns are used as mode multiplexers. We measured a transmission distance of 900 km for 32 WDM channels with a 100 GHz channel spacing and a distance of 1500 km for a single wavelength channel experiment.
We demonstrate combined mode- and wavelength multiplexed transmission of 23 Tbit/s over 17 km conventional graded-index multimode fiber. We selectively couple and receive all spatial modes in the lowest 3 mode-groups of the multimode fiber using photonic-lanterns based mode-couplers. The transmitted signals are recovered by 12×12 MIMO digital signal processing.
We experimentally demonstrate transmission over a novel multicore fiber with 9 cores arranged in 3 groups of 3 cores, where strong coupling occurs within the groups and weak couplings between groups. We transmitted over 2500 km in a single group at a time and 715 km when all 9 cores are used. Low-loss 3D waveguides are used as couplers.
We report the results of an experimental investigation of inter-modal nonlinearities in a 4.7-km few-mode fiber (FMF). Both inter-modal cross-phase modulation (IM-XPM) and inter-modal four-wave mixing (IM-FWM) have been observed between waves separated by a several Terahertz.
We demonstrate combined WDM/MDM transmission over a novel few-mode fiber based 1 × 9 wavelength-selective switch that supports fibers with 6 spatial and polarization modes. The effect on transmission of cascaded passband filtering and mode-dependent loss build-up is investigated in detail.
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