Simultaneous radio/pump/power-over-multi-core fiber transmission for optically powered radio units eliminating electrical power amplifiers.

We demonstrate simultaneous radio-/pump-/power-over-fiber transmission using a single multi-core fiber for downlink radio-over-fiber transmission. This scheme not only introduces a remotely pumped optical amplifier to eliminate electrical power amplifiers (PAs) in radio units (RUs) but also drives a high-power photodiode, which is the main component of the RU by power-over-fiber. Using this scheme, we achieved a 20-dB improvement in the RF output signal power using a remotely pumped optical amplifier without electrical PAs in the optically powered RU.

Trans-Pacific class transmission over a standard cladding ultralow-loss 4-core fiber.

The total capacity of optical submarine cable systems as a global communication infrastructure must be continuously enlarged. Multi-core fibers (MCFs) have been studied as methods to maximize the total cable capacity under electrical power and cable space limitations. In particular, standard cladding MCFs, which are expected to have high productivity and mechanical reliability, are attractive for early deployment in submarine cable systems.

Ultra-dense spatial-division-multiplexed optical fiber transmission over 6-mode 19-core fibers.

Ultra-dense spatial-division multiplexing (SDM) is achieved by mode multiplexed technique with multiple cores in a single fiber, namely few-mode multi-core fiber. Using a 9.8-km six-mode nineteen-core fiber, we demonstrate an ultra-dense SDM transmission of 16-channels wavelength-division-multiplexed (WDM) dual-polarization quadrature phase shift keying signals, achieving a record spatial multiplicity of 114.

Scalable software-defined optical networking with high-performance routing and wavelength assignment algorithms.

The feasibility of software-defined optical networking (SDON) for a practical application critically depends on scalability of centralized control performance. The paper, highly scalable routing and wavelength assignment (RWA) algorithms are investigated on an OpenFlow-based SDON testbed for proof-of-concept demonstration. Efficient RWA algorithms are proposed to achieve high performance in achieving network capacity with reduced computation cost, which is a significant attribute in a scalable centralized-control SDON.