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We characterize an OAM-MDM link by measuring the channel impulse response using two OAM fiber designs investigating the impact of TE01, TM01 modes on receiver performance and required equalizer taps in separate mode detection schemes.
We demonstrate MIMO-free two-dimensional multiplexing, transmission and demultiplexing over 4 OAM modes (including two modes of |l| = 2) and 15 wavelengths through 100-meter inverse-parabolic graded-index fiber with aggregated total capacity of 3.36-Tbit/s.
In the past decade, CW fiber lasers have revolutionized industrial material processing because of their high efficiency, robustness and diffraction-limited beams obtained in kW regimes. However, the output power from a single fiber laser is limited by phenomena such as non-linear effects or excessive heating. To overcome these issues, incoherent beam combining (IBC) of multiple independent fiber lasers...
Integrated Bragg grating filters in silicon-on-insulator waveguides are evolving from simple broadband reflectors to filters with complex spectral responses and high-speed modulators. We review recent progress and applications of these devices.
We demonstrate an elliptical ring core fiber featuring vector modes with high stability and linear polarization states. We achieve six vector mode channel transmission over 0.9 km of 32 Gbaud QPSK without MIMO/PDM signal processing.
We demonstrate the mode division multiplexing system using two orbital angular momentum modes over 1.4 km RCF fiber. We also use a new mode demultiplexing scheme enabling us to do electrical polarization demultiplexing.
We investigated the cross-talk in 6-core erbium doped amplifiers. Results indicate that the amplifier has lower cross-talk when the fiber bending radius >30 mm. The bending induced pump distribution nonuniformity can be reduced by randomly-twisting the fiber.
We report the Brillouin gain spectra (BGS) of vector modes in a few-mode fiber for the first time. Vector modes were excited via a long period fiber grating and the BGS acquired through heterodyne detection.
We investigate the impact of intermodal coupling between vector modes supported by specially designed fibers for OAM propagation on the complexity of receiver in OAM-MDM transmission systems.
We directly measure the optimum length and the mode-dependent gain of multi-core and few-mode optical amplifiers using a swept wavelength interferometer operated in reflection mode. The technique requires only one space multiplexer and eliminates cut-backs.
We demonstrate the first Bragg-grating-based 4-channel O-band (de-)multiplexer fabricated using 193nm lithography on submicron-SOI with small features below 140nm.
We compare two 6-core annular cladding erbium-doped fibers achieving >19 dB gain and <6 dB noise figure across the C-band. The annular cladding improves the pump power utilization by 40% compared to uniform double-cladding.
The effect of spin-orbit coupling in air-core optical fibers degrades the purity of orbital angular momentum modes and induces significant crosstalk. We numerically investigate different air-core fiber geometries and discuss the trade-off between OAM mode purity and effective index separation.
The ROAM (Revolutionizing optical fiber transmission and networking using the Orbital Angular Momentum of light) project investigates the orbital angular momentum (OAM) modes of light for communications and networking applications. OAM modes are exploited as a disruptive means of increasing fibre transmission capacity and as switching resource to improve the switches scalability and power consumption...
Low-power, high-speed optical interconnects are essential to future high-performance computers and data centers for the cloud. Using CMOS-compatible silicon photonics processes, we have developed integrated photonic devices, such as 80 Gb/s optical modulators with ultralow power consumption at the level of femtojoule per bit and O-band on-chip wavelength multiplexers. These devices are promising for...
Silicon photonics enables new pinnacles of large-scale photonic integration, aiming at the need for large bandwidth in next-generation data centers and interconnects systems. Ultra-high data streams are thus required in the smallest footprint using the lowest amount of power possible. On the silicon-on-insulator platform, microring modulators are a promising solution providing desirable compactness...
Ultra-high data rate is required for future cloud computing and interconnects systems, for which integrated optical transceivers provide promising solutions. We report 66 Gb/s, on-off keying (OOK) operation of a silicon microring modulator (MRM) consuming a low power of 15 fJ/bit. To the best of our knowledge, this result features the fastest binary shift keying operation using a MRM.
We propose the use of a dual-microring system as an on-chip multi-level signal generator without using an external digital-to-analog converter (DAC). Four-level pulse-amplitude modulation (PAM-4) signals up to 60 Gb/s have been experimentally achieved.
We demonstrate two in-line cladding-pumped 6-core Erbium-doped fiber amplifiers with recirculation loop transmission over 465-km coupled-6-core fiber. Total capacity of 7.2-Tb/s SDM/WDM transmission is achieved with a spectral efficiency of 18-bit/s/Hz.
The orbital-angular-momentum states in fibers have similar polarization-mode dispersion property than single mode fibers. A fixed-analyzer technique is demonstrated to characterize this phenomenon in an OAM fiber that supports up to the second order OAM mode.
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