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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.
We present a supermode fiber to support orbital angular momentum (OAM) multiplexing. The designed supermode fiber can guide multiple OAM modes with favorable performance of low mode coupling, low nonlinearity, and low modal dependent loss.
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...
A compact wavelength-division (de)multiplexer is proposed and demonstrated experimentally to achieve doubled channel number and halved channel spacing by utilizing a bidirectional arrayed-waveguide grating integrated with an Mach–Zehnder interferometer optical interleaver. As an example, an 18-channel wavelength-division (de)multiplexer with a channel spacing of 200 GHz is designed and 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 design and fabricate a simple ultracompact wavelength-controllable bi-directional optical diode. It consists of a silicon microring (nonlinear attenuator) and a directional coupler (linear attenuator). High nonreciprocal transmission (∼24.2dB) is achieved. Negligible-penalty OFDM/OAM 64-QAM signaling through the diode is demonstrated.
We design and fabricate on-chip two/three mode (de)multiplexer using a tapered asymmetrical directional coupler. System experiments of OFDM 64/128/256-QAM data transmission have been carried out for on-chip two/three mode (de)multiplexing applications.
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 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 report the spectral pump equalization of on-chip microresonator frequency combs in the drop-port geometry. A smoother comb spectrum is obtained and a saturation behavior of the optical pump in the microresonator is observed.
We demonstrate programmable electrical waveform generation around 10 GHz frequency using a SiN microring spectral shaper at both polarizations. Shaping is controlled by ring resonances that may be thermally tuned using micro-heaters in ∼1 ms.
We designed a hollow-core mode-gap cavity in three-layer photonic crystals with Q of 77,000 and 67% air energy concentration ratio. The 3D photonic confinement is achieved through in-plane PBG guiding and vertical total internal reflection.
We demonstrate an optical diode with up to 28dB transmission contrast at telecommunication wavelengths. It is based on strong optical nonlinearity in two resonance-matched silicon microrings. No external assistance other than input light is required.
We report 40 Gbit/s phase-erased demodulation for RZ-DPSK/CSRZ-DPSK signals by exploiting cascaded second-order nonlinearities in a periodically poled lithium niobate (PPLN) waveguide. All-optical 40 Gbit/s ODB/AMI-to-RZ format conversion is also demonstrated in the experiment.
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