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We demonstrate free-space space-division-multiplexing (SDM) with 15 orbital angular momentum (OAM) states using a three-dimensional (3D) photonic integrated circuit (PIC). The hybrid device consists of a silica planar lightwave circuit (PLC) coupled to a 3D waveguide circuit to multiplex/demultiplex OAM states. The low excess loss hybrid device is used in individual and two simultaneous OAM states multiplexing and demultiplexing link experiments with a 20 Gb/s, 1.67 b/s/Hz quadrature phase shift keyed (QPSK) signal, which shows error-free performance for 379,960 tested bits for all OAM states.

Articles you may be interested inInfluence of the electrical contact on the reliability of InP-based ridge waveguide distributed feedback semiconductor diode lasers for telecommunications applications J. Vac. Sci. Technol. A 22, 803 (2004); 10.1116/1.1701855 Single-lobe, surface-normal beam surface emission from second-order distributed feedback lasers with half-wave grating phase shift Appl. Phys. Lett. 83, 5365 (2003); 10.1063/1.1636248 Wide-range-tunable laterally coupled distributed feedback lasers based on InGaAsP-InP Appl.

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We propose a method for increased-speed all-optical XOR operation using semiconductor optical amplifiers. We demonstrate XOR and XNOR operations at 86.4 Gb/s using a pair of photonic-integrated semiconductor optical amplifier Mach-Zehnder interferometers.

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