We design and demonstrate broadband directional couplers that use asymmetric-waveguide based phase control sections, on the silicon-on-insulator platform. Broadband with various power splitting ratios, including 10%/90%, 20%/80%, 30%/70%, 40%/60% 50%/50%, were realized for both transverse electric (TE) magnetic (TM) modes. Some of devices exhitbit bandwidths in excess 100 nm, all 75 nm. The footprints TE mode are 32 μm ×1.3 μm, or less, those TM 13 less.

We experimentally demonstrate a compact broadband polarization beam splitter (PBS) based on multimode interference (MMI) coupler with internal photonic crystal (PC) for the silicon-on-insulator platform. The PC structure is optimized to be reflective transverse electric and transparent magnetic over broad wavelength range. A detailed study of device operation, including band gap influence each mode MMI coupler, presented. designed PBS has been fabricated using electron lithography feature...

We demonstrate the realization of plasmonic analog electromagnetically induced transparency (EIT) in a system composing two stub resonators side-coupled to metal-dielectric-metal (MDM) waveguide. Based on coupled mode theory (CMT) and Fabry-Perot (FP) model, respectively, formation evolution mechanisms plasmon-induced by direct indirect couplings are exactly analyzed. For coupling between resonators, FWHM group index transparent window inter-space more sensitive than width one cut, high up...

We experimentally demonstrate compact broadband directional couplers using subwavelength gratings for silicon-on-insulator wafers with silicon layers of 220 nm. The dispersion properties the optical modes are engineered gratings, which allow operation. Finite-difference time-domain (FDTD)-based band structure calculations, significantly reduced simulation time, were used to analyze design, included both and material dispersions. Compact direction couplers, device lengths shorter than 14...

We demonstrate a novel polarization beam splitter (PBS) based on subwavelength grating (SWG) multimode interference (MMI) coupler for the silicon-on-insulator platform. The birefringence of MMI is engineered using SWG, which leads to compact design footprint, with device length less than 100 μm. Our PBS has simulated extinction ratios (ERs) better 20 dB both polarizations over wavelength range from 1530 1625 nm that covers entire Cand L-bands. fabricated achieves measured ERs larger at 1550...

We design and demonstrate a wideband silicon photonic polarization beamsplitter on silicon-on-insulator platform. The device consists of two 3 dB broadband couplers cascaded in point-symmetric network. transverse electric (TE) magnetic (TM) modes are coupled to different output ports due large difference between their coupling strengths. exhibits isolation at both the ports, more than 20 over bandwidth 125 nm, small excess loss, less 0.5 for entire C-band.

We demonstrate spiral Bragg grating waveguides (BGWs) on the silicon-on-insulator (SOI) platform for fundamental transverse magnetic (TM) mode. also compare TM to equivalent electric (TE) and show that have lower propagation losses. Our are space-efficient, requiring only areas of 131×131 µm(2) accommodate 4 mm long BGWs, and, thus, less susceptible fabrication non-uniformities. Due lengths reduced susceptibility non-uniformities, we were able obtain narrow bandwidth, large extinction ratio...

Coupling of light from off-chip into highly complex silicon-based devices is currently focus efforts and research. In this work, the experimental demonstration a -0.50 dB (89%) coupling efficiency in C-band with help an aperiodic grating coupler design 250 nm silicon-on-insulator (SOI) technology shown. Further, work reports about latest results regarding focusing couplers footprints only 30 μm × measured up to -0.93 (81%) at 1549 nm. Efficient arrays are realized by using expanded backside...

We demonstrate adiabatic couplers (ADCs) with design-intended splitting ratios (SRs) for the silicon-on-insulator (SOI) platform. The operational principle, numerical simulations, and experimental results on designed ADC are presented. In we derive analytical relationship between SR effective index-difference, based which calculate corresponding SRs under various output waveguide width-differences at a central wavelength of 1310 nm. For simulation process, segmented optimization method is...

We design and demonstrate a compact broadband polarization beam splitter (PBS) using symmetric directional coupler with sinusoidal bends on silicon-on-insulator platform. The in our PBS suppress the power exchange between two parallel strip waveguides for transverse-electric (TE) mode, while allowing maximum transfer to adjacent waveguide transverse-magnetic (TM) mode. Our has nominal length of 8.55 μm, it an average extinction ratio (ER) 12.0 dB TE ER 20.1 TM isolation (PI) 20.6 through...

We experimentally and via simulations demonstrate ultracompact single-stage cascaded optical add-drop multiplexers using misaligned sidewall Bragg grating in a Mach-Zehnder interferometer for the silicon-on-insulator platform. The configuration has device footprint of 400 μm × 90 μm, 125 μm. proposed designs have 3-dB bandwidths 6 nm extinction ratios 25 dB 51 dB, respectively, been fabricated transverse electric mode. A minimum lithographic feature size 80 is used our design, which within...

We demonstrate a polarization-independent mode-evolution-based coupler for the silicon-on-insulator platform. The measured has negligible insertion loss over bandwidth of about 100 nm, i.e., from 1500 to 1600 nm. maximum power imbalances are 1.2 and 0.2 dB fundamental transverse electric (TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">00</sub> ) mode magnetic (TM mode, respectively. Our also compact design footprint with mode-evolution...

We design and experimentally demonstrate an ultra-broadband compact two-mode multiplexer based on subwavelength-grating-slot-assisted adiabatic coupler for the silicon-on-insulator platform. The introduction of subwavelength-grating slot effectively increases refractive index gap region between two strip waveguides enhances coupling them, leading to high modal transmission over a short mode-evolution region, particularly at short-wavelength regime. As result, our has footprint, with length...

We designed and fabricated a polarization splitter-rotator (PSR) on silicon-on-insulator (SOI) platform based an asymmetric directional coupler. The coupler consists of regular strip waveguide sub-wavelength grating (SWG) waveguide. SWG used in the design provides freedom to engineer dispersion properties supermodes, which allow be fabrication tolerant width variations. A measured peak conversion efficiency −0.3 dB crosstalks below −10 were achieved. PSR has compact size 35 <inline-formula...

We demonstrate wavelength-selective reflectors based on silicon microdisk resonators integrated with compact Y-branch splitters, using a CMOS-photonics technology. A high quality factor (Q) of ~ 88,000 was measured in the reflection spectrum for 2.5-μm-radius device small footprint 6 × 17 μm(2) and wide free-spectral range (FSR) over 41 nm. As radius is reduced to 1.5 μm, corresponding 4 15 μm(2), shows an ultra-wide FSR 71 nm compromise having Q 4000. The coupling between waveguide...

We have experimentally demonstrated the ability to couple an arbitrary polarization state from a fiber TE-mode of single waveguide in integrated silicon photonics circuit with extinction ratio larger than 31 dB, measured between output ports photonic circuit. To achieve this we combined 2D- grating coupler and Mach-Zehnder Interferometer (MZI). After accounting for setup coupling losses, 1 mW input into 2D coupler, obtain average power 0.98 at desired waveguide, less 1.2 dB variation across...

Rapid advances in high-resolution chip lithography have accelerated nanophotonic device development on the silicon-on-insulator (SOI) platform. The ability to create sub-wavelength features silicon has attracted research photonic band and dispersion engineering consequently made available a wide array of functionalities. By drawing recent demonstrations, authors review how periodic, structures are used for passive wave manipulation SOI design. optical response is evaluated both orthogonal...

We experimentally demonstrate ultra-compact (<0.008mm2), 4-channel CWDM demultiplexers using silicon photonic contra-directional couplers. Flat-top passbands of 10nm, insertion loss lower than 1dB, and crosstalk -20dB have been obtained.

In this work, we propose a time-efficient method to analyze and design the adiabatic couplers (ACs) on silicon-on-insulator platform. By analyzing mode-evolution region of ACs, derive boundary conditions necessary constraints tapering functions achieve optimized performance. Taking these into consideration, choose three common types for region. Based width separation constituent waveguide pair, performance ACs with different is compared. The compared were fabricated measured. splitting...

A compact UltrawideBand (UWB) dipole antenna with an integrated wideband balun is presented. The proposed consists of a printed dipole, slot embedded in the ground plane, and inverted L-shaped microstrip feedline. By using balun, unbalance-to-balance transformer from feedline to achieved. This achieves small size 16 mm× 28 mm × 0.8 based on substrate having dielectric constant 2.55, operates over frequency band 2.9 GHz 10.7 GHz, reflection coefficient <;-10 dB relative impedance matching...

We report on the analysis and experimental study of a silicon photonic single microring modulator (MRM) assisted Mach-Zehnder interferometer for high-speed four-level pulse amplitude modulation (PAM-4). The static extinction ratio (ER) proposed device is 18 dB larger than that MRM with same design parameters. Under 0 V reverse bias voltage, measured 3-dB electro-optic bandwidth 20 GHz. Based enhancement ER, 40 Gb/s on-off keying eye diagram shows MRM. further present 76 PAM-4 using in...

We report silicon photonic modulators based on Bragg grating cavities with a reverse-biased p-n junction embedded in the waveguide. Modulation bandwidths exceeding 10 GHz have been obtained.

We propose a 1310/1550 nm wavelength diplexer on 220-nm silicon-on-insulator (SOI) platform. The device is based compact two-mode interference (TMI) coupler enabled by subwavelength grating (SWG) slot. ideal beat length ratio of 2:1 achieved with the transverse magnetic (TM) mode fine-tuning SWG slot parameters, resulting in TMI only 37 µm. reveal that key to high extinction (ER) careful design tapers, and achieves ERs 28.05/42.54 dB at simulation. measured bandwidths for ER <inline-formula...