Silicon nitride is demonstrated as a high performance and cost-effective solution for dense integrated photonic circuits in the visible spectrum. Experimental results nanophotonic waveguides fabricated standard CMOS pilot line with losses below 0.71dB/cm an aqueous environment 0.51dB/cm silicon dioxide cladding are reported. Design characterization of waveguide bends, grating couplers multimode interference (MMI) at wavelength 660 nm presented. The index contrast this technology enables...

We propose an ultra-broadband multimode interference (MMI) coupler with a wavelength range exceeding the O, E, S, C, L and U optical communication bands. For first time, dispersion property of MMI section is engineered using subwavelength grating structure to mitigate dependence device. present 2 × design bandwidth 450nm, almost fivefold enhancement compared conventional designs, maintaining insertion loss, power imbalance phase deviation below 1dB, 0.6dB 3°, respectively. The performed...

Ring resonator modulators (RRM) combine extreme compactness, low power consumption and wavelength division multiplexing functionality, making them a frontrunner for addressing the scalability requirements of short distance optical links. To extend data rates beyond classically assumed bandwidth capability, we derive experimentally verify closed form equations electro-optic response asymmetric side band generation resulting from inherent transient time dynamics leverage these to significantly...

We report on the design of Silicon Mach-Zehnder carrier depletion modulators relying epitaxially grown vertical junction diodes. Unprecedented spatial control over doping profiles resulting from combining local ion implantation with epitaxial overgrowth enables highly linear phase shifters high modulation efficiency and comparatively low insertion losses. A average shifter VπL = 0.74 V⋅cm is reached between 0 V 2 reverse bias, while maintaining optical losses at 4.2 dB/mm intrinsic RC cutoff...

A detailed description of the non-linear effects in silicon is needed when designing ring resonators platform. The optical field propagating waveguide strongly absorbed due to two-photon-absorption (TPA) and free-carrier-absorption (FCA), which become more prominent with increasing input power ring. We present a new approach for modelling based resonators. have numerically solved problem coupling variation refractive index loss TPA, FCA , self-heating Shockley-Read-Hall (SRH) theory...

High-performance silicon nitride focusing grating couplers with AlCu/TiN reflectors for a visible wavelength (660 nm) have been designed and fabricated in standard complementary metal-oxide-semiconductor pilot line. The influence of the bottom oxide cladding thickness on decay length efficiency is theoretically experimentally investigated. It shown how metal reflector not only increases but also allows reduction radiated beam size. Coupling efficiencies above 59% measured compact gratings.

We report on two edge-coupling and power splitting devices for hybrid integration of III-V lasers with sub-micrometric silicon-on-insulator (SOI) waveguides. The proposed relax the horizontal alignment tolerances required to achieve high coupling efficiencies are suitable passively aligned assembly pick-and-place tools. Light is coupled on-chip single mode SOI waveguides almost identical efficiency, but a varying relative phase accommodating lateral misalignment between laser diode devices,...

Abstract We demonstrate a wavelength domain-multiplexed (WDM) optical link relying on single section semiconductor mode-locked laser (SS-MLL) with quantum dash (Q-Dash) gain material to generate 25 carriers spaced by 60.8 GHz, as well silicon photonics (SiP) resonant ring modulators (RRMs) modulate individual channels. The requires reamplification provided an erbium-doped fiber amplifier (EDFA) in the system experiments reported here. Open eye diagrams signal quality factors (Q-factors)...

We present a novel resonant Mach-Zehnder modulator whose arms are each loaded with five identical resonators. Size and power consumption aggressively reduced compared to conventional modulators based on linear phase shifters. At the same time, large optical bandwidth of 3.8 nm is maintained. experimentally demonstrate open eye diagrams at 30 Gbps signal Q-factor remaining within factor 2 its peak value in an operational temperature range spanning 55°C.

We report pump-probe measurements of time resolved optical transmission spectra Si and Si/poly-Si microrings after high free carrier densities have been generated by two-photon absorption the pump pulse. From measurements, we can extract recovery dynamics absorption, refractive index dispersion, carriers finally effective initial lifetimes. The method is validated comparing modelling simulations with measurements; obtained results are in very good agreement what predicted Shockley-Read-Hall...

We report recent progress made in our laboratory on travelling wave Mach-Zehnder Interferometer based Silicon Photonics modulators with segmented transmission lines, as well resonant ring and add-drop multiplexers peaking enhanced bandwidth extended beyond the photon lifetime limit. In microstructuring of electrodes results radio-frequency modes significantly deviating from transverse electromagnetic (TEM) condition allows for additional design freedom to jointly achieve phase matching,...

A polarization rotator, suitable for integration in a diversity optical receiver fabricated InP technology, is proposed. The device, based on two steps waveguide includes tapered input and output ports that provide very low insertion loss (<0.04  dB). An extinction ratio of 40 dB at 1550 nm wavelength calculated, comparable or even superior to other state the art converters. main advantage proposed design capability implementation using standard fabrication process...

We present a flip-chip integration process in which the vertical alignment is guaranteed by mechanical contact between pedestals defined recess etched into silicon photonics chip and laser or semiconductor optical amplifier. By selectively etching up to active region of III-V materials, we can make accuracy independent on control applied layer thicknesses during fabrication, enabling tolerances below ±10 nm (Z-)direction.

Laser integration, optical coupling, and assembly are challenging problems that need to be further addressed reduce the manufacturing costs of silicon photonic-based products. In this paper, we propose novel coupling devices facilitate passive photonics chips with laser diodes fibers by means pick-and-place tools relaxing stringent alignment tolerances required for maintaining a high efficiency. these devices, lateral misalignment or fiber relative chip is accommodated varying phase...

We demonstrate a complete Silicon Photonics WDM link relying on single section semiconductor mode-locked laser and SOA to support up 12 multiplexed channels with bit error rate of 1e-12 at serial data rates 14 Gbps without channel pre-emphasis, equalization or forward correction. Individual reach free operation 25 multi-channel is shown be compatible standard 7% overhead hard decision transmitter receiver chips are hybridly integrated driver electronics. A detailed model derived verified....

We present wideband and large free spectral range optical filters with steep passband edges for the selection of adjacent WDM communication channels that can be reliably fabricated mainstream silicon photonics technology. The devices are based on three cascaded stages coupled resonator waveguides loaded a common bus waveguide. These differ in number resonators but implemented exactly identical unit cells, comprised matched racetrack layout uniform spacing between cells. different each stage...

We present a design of tunable hybrid laser based on III-V Reflective Semiconductor Optical Amplifier (RSOA) and Silicon Photonics (SiPh) external mirror that represents good trade off between high Wall-Plug Efficiency (WPE) tolerance to optical feedback caused by unwanted back reflections from the rest SiPh chip. The sensitivity different configurations, an important issue in many applications, is evaluated through calculation critical level effective Lang-Kobayashi model main results are...

We address the stability of a tunable hybrid laser based on III-V Reflective Semiconductor Optical Amplifier (RSOA) edge-coupled with Silicon Photonic (SiPh) dispersive mirror through model time-delayed algebraic differential equations that accounts for narrow band mirror. Our results allow to (i) analyze single mode lasing, (ii) quantify impact bandwidth damping relaxation oscillations and emergence photon-photon resonance, (iii) study tolerance external optical feedback. Thanks this...

We report on how external cavity III-V/SiN hybrid lasers operate in regimes of ultra-damped relaxation oscillations or CW unstable dynamical (self-pulsing approaching turbulence) as a consequence mirror dispersion, non-zero linewidth enhancement factor, and four-wave mixing the gain medium. The impact dispersive bandwidth different effective lengths laser tolerance to optical feedback is also discussed.

Photonic Integrated Circuits (PIC) will change the fundamental paradigms for design of multi-color laser engines life sciences. Exemplified with flow cytometry (FCM), integrated optical technology visible wavelengths be shown to open a new spectrum possibilities control cell illumination patterns, such as number output spots, spot size, and even complex patterns generated by interferometry. Integration additional functions variable attenuation, wavelength division multiplexing or fast...

Ring resonator modulators reach high modulation efficiencies, are very compact and can be electrically driven as lumped elements. However, their limited optical bandwidth requires temperature stabilization, limiting power efficiency. A novel ring assisted Mach-Zehnder modulator (MZM) aggressively reduces consumption. Moreover, an integration scheme passively sets the 3 dB point during attachment of input fiber relative to a multimode grating coupler used first splitter element...

We present a novel Mach-Zehnder Interferometer configuration that can be passively balanced by adjusting the position of input fiber over multimode coupler, thus correcting phase deviations typically arising from fabrication asymmetries. Characterization after permanent array attachment means UV curable epoxy shows high thermal stability resulting in less than 0.5 dB power imbalance at output interferometer temperature range 20 to 80°C.

We describe a resonantly enhanced Mach-Zehnder modulator (MZM) that can be operated over wide temperature range of 55°C without being actively biased, while providing significant resonant enhancement 6.8 at the nominal wavelength / compared to linear MZM driven with distributed driver. More importantly, it enables ~20X improvement in power consumption 50 Ω matched travelling wave comparable phase shifter technology, drive voltage and output optical modulation amplitude. Passive biasing...

We demonstrate an 8 by 14 Gbps compatible WDM link based on a single-section semiconductor mode-locked laser, silicon photonics resonant ring modulators and joint channel reamplification with optical amplifier operated in the linear regime. Individual channels reach data rate of 25 signal quality-factors above 7.