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We present a compact quasi parity-time (PT) symmetric photonic device by using two sets of interleaved tailored gratings. By tailored design, broadband asymmetric optical mode conversion and transmission could be realized over a wide wavelength range from 1.45 μm to 1.65 μm.
Silicon photonics offers a promising integration platform facilitating chip-scale optical signal processing. We review recent research progress in integrated optical signal processing with silicon platform by employing advanced multi-level modulation formats. Using fabricated silicon waveguides, gratings, couplers, microring resonators, vertical slot waveguides and hybrid plasmonic waveguides, we...
GaN-based ridge waveguides with very smooth and vertical sidewalls are fabricated with combined inductively coupled plasma (ICP) etching and chemical etching. Reduction in scattering loss is estimated to be 2 dB/mm at 1.55 μm.
SiN micro-resonators with a cross section of 3×0.6 μm2 and an FSR of 25 GHz were demonstrated with intrinsic Qs up to 17 million, showing frequency comb onset power as low as 5.6 mW.
A novel 64-channel silicon hybrid demultiplexer is proposed and demonstrated by utilizing a 1×4 ADC-type mode demultiplexer and two 17×17 bi-directional AWGs. With the proposed design, the hybrid demultiplexer becomes very compact and this issue of the channel-wavelength's misalignment is also relaxed greatly in comparison with the previous design. The insertion loss and crosstalk for the fabricated...
Novel fabrication process of SiNx/SiO2 waveguide based on sidewall oxidation of patterned silicon substrate is proposed. The fabrication time of the lower SiO2 cladding is about one third of that of the conventional process.
We will review our recent progress in the fabrication of integrated nanophotonic devices and their applications in on-chip optical signal transmission and processing with advanced modulation formats. We will talk about both theoretical and experimental works on chip-scale optical signal transmission for photonic interconnections and various on-chip photonic signal processing functions (wavelength...
We design and fabricate a vertical hybrid SPP waveguide. The suitability of ultrahigh-bandwidth data transmission through the proposed waveguide by transmitting 1.8-Tbit/s (161 wavelength 11.2-Gbit/s) WDM OFDM 16-QAM is studied. The BERs of all 161 channels are less than 1e−3.
We design and fabricate silicon vertical slot waveguides. Ultra-wide bandwidth 1.8-Tbit/s (161 WDM 11.2-Gbit/s OFDM 16-QAM) data transmission through 1-mm, 2mm, 3.1-mm, 12.2-mm-long silicon vertical slot waveguides are demonstrated in the experiment. All 161 WDM channels achieve BER less than 1e-3 after propagating through silicon vertical slot waveguides.
We design an optically-controlled mode converter using optical force. A deformable nanostring can be deflected by optical gradient force, changing the coupled mode in a multimode waveguide and enabling a mode converter.
We report all-optical wavelength conversion of OFDM m-QAM signals by exploiting degenerate four-wave mixing (FWM) in a silicon waveguide. Low penalty silicon-waveguide-based wavelength conversions of OFDM m-QAM (m=16, 32, 64, 128) signals are successfully demonstrated in the experiment.
By exploiting multiple non-degenerate four-wave mixing in silicon-organic hybrid slot waveguide and 16-ary phase-shift keying signals, we implement three-input (A, B, C) multicasted 160-Gbit/s optical hexadecimal addition/subtraction (A+B−C, A+C−B, B+C−A, A+B+C, A−B−C, B−A−C). Performance is evaluated by error vector magnitude and dynamic range of signal power.
We design a novel wedge hybrid terahertz (THz) plasmonic waveguide which features longer propagation length and deep-subwavelength mode confinement. It offers improved propagation length, normalized mode area and figure of merit 1.4, 13.5 and 5.3 times compared to the rectangular hybrid THz waveguide.
We present ultrahigh-speed transmission of 3.84-Tbit/s 64-QAM signal in Si ridge and Si slot waveguides. Si slot waveguide confining light in air slot region features reduced nonlinearity and resultant superior transmission performance with low penalty for varied input signal power from 1 to 250 mW.
We present an optically-controlled tunable silicon DQPSK demodulator using optical force. It employs a cantilever nanostring to adjust phase shift by a counter-propagating control light. 40-Gbaud/s DQPSK demodulation is implemented using the designed opto-mechanical tunable DQPSK demodulator with the performance evaluated by Q-factor and BER.
We investigate a nonlinear coupling effect which results from frequency comb-induced pump saturation in a silicon nitride microring cavity fabricated with both through-and drop-ports.
We present optically-controlled extinction ratio (ER) and Q-factor tunable silicon microring resonators using optical forces. Two opto-mechanical structures are studied, i.e. double-clamped and cantilever. A wide ER tuning range from 5.6 to 34.2dB is achieved. Low control power of 1.4mW is required for cantilever structure.
A polarization beam splitter with cascaded asymmetrical directional couplers is demonstrated experimentally on a silicon-on-insulator (SOI) platform. The measured extinction ratios of the fabricated PBS are about 11dB and 13dB for TE/TM polarizations.
We demonstrate an all-silicon optical transistor that realizes NAND and NOR logic without the need to physically alter the device. The device is cascadable and may provide an efficient solid-state implementation of artificial neural networks.
An add-drop filter with asymmetric coupling to bus waveguides, cascaded with a notch filter, achieves diode and transistor effects, and realizes NAND and NOR logic without physically altering the device, emulating the function of neurons.
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