Space division multiplexing (SDM) is currently widely investigated in order to provide enhanced capacity thanks to the utilization of space as a new degree of multiplexing freedom in both optical fiber communication and on-chip interconnects. Basic components allowing the processing of spatial modes are critical for SDM applications. Here we present such building blocks implemented on the silicon-on-insulator (SOI) platform. These include fabrication tolerant wideband (de)multiplexers, ultra-compact mode converters and (de)multiplexers designed by topology optimization, and mode filters using one-dimensional (1D) photonic crystal silicon waveguides. We furthermore use the fabricated devices to demonstrate on-chip point-to-point mode division multiplexing transmission, and all-optical signal processing by mode-selective wavelength conversion. Finally, we report an efficient silicon photonic integrated circuit mode (de)multiplexer for few-mode fibers (FMFs).
An all-optical tunable delay line based on wavelength conversion in semiconductor optical amplifier (SOA), and group-velocity
dispersion (GVD) in dispersion-compensating fiber (DCF) is theoretically analyzed and numerically
demonstrated. By describing the basic theory, modeling and simulating the processes, we show that the scheme is
feasible to produce large time delays. The system operates near 1550 nm, and with a nonreturn-to-zero (NRZ) pattern at
10 and 40 Gb/s, time delays from -3360 to 3360 ps are observed. The system achieves continuous control of a wide
range of delays, wide signal bandwidth, nearly no pulse broadening, and very little spectral distortion.
We propose an ultrafast all-optical logic AND gate based on two cascaded SOA-OF configurations. Each SOA-OF consists a semiconductor optical amplifier (SOA) followed by an optical filter (OF) which reshapes the spectrum of the modulated probe light. A delayed interferometer (DI) and a tunable band pass filter (TNBPF) are chosen as OFs in the first and second SOA-OF. 40Gbit/s AND operation with 33% duty cycle return-to-zero (RZ) signals has been successfully demonstrated with SOAs whose 10%~90% recovery time are measured much larger than the time duration of one bit period. The quality factor (QF) and the extinction ratio (ER) of the eye diagram of the derived AND results were 6.3 and 8.8dB respectively. Numerical analysis and experimental demonstration with 40Gbit/s nonreturn-to-zero (NRZ) signals is also presented and shows that in order to achieve good AND result at the second stage, the differential time delay of the DI must be shorter than the single bit period of the input signals. The proposed AND gate takes the advantage of high speed WC realized by SOA-OF which displays flexibility to various data rates, pulse width as well as data formats.
We propose and demonstrate a novel approach generating ultrawideband (UWB) monocycle pulses using cross phase
modulation (XPM) of the semiconductor optical amplifier (SOA). A pair of polarity-reversed UWB monocycle pulses is
achieved by locating the probe carrier at the positive and negative linear slopes of the filter. We achieve different UWB
spectrum width by 25ps- and 50ps-width Gauss pulse injection. The generated monocycle pulses can be controlled by
either optical Gauss pulse or both injections, which function as logic OR-monocycle. It has potential applications in
UWB-over-fiber communications.
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