1,721,058 research outputs found
A compact silicon photonic DQPSK receiver based on microring filters
No full textAn extremely compact integrated receiver for differential quadrature phase shift keying signals based on two tunable silicon-on-insulator microring resonators and four integrated germanium photodetectors is reported. Simulations show the expected performance of the device and how it compares with alternative receivers, i.e., conventional receivers based on delayed Mach-Zehnder interferometers and Gaussian filters-based ones. The device, fabricated in a silicon photonic multiuser wafer run, is described and experimentally characterized showing operation for signal ranging from 10 to 20 Gbaud
Crosstalk and BER performance of closely-spaced silicon-on-insulator waveguide arrays
No full textThe high interest for on-chip communications is driven by the possibility to exchange massive amounts of data between different resources (CPUs, GPUs, memories) directly on a system-on-chip. Optical on-chip transmission techniques promise to enhance bandwidth density and transmission reach compared to current electronic solutions.
In this context, mode division multiplexing in integrated optical waveguides has been investigated, but it still suffers from crosstalk and scalability issues. To overcome these problems, super-modes in arrays of closely-spaced waveguides can be exploited, supporting many parallel channels with low crosstalk.
In this paper we consider non-uniform arrays of closely-spaced waveguides in silicon photonics, and experimentally assess the spectral and BER performance of several array designs. Results demonstrate parallel data transmissions at 10 Gb/s over different waveguides with crosstalk <-16 dB and a power penalty <1 dB at BER =1e-9, paving the way for ultra-dense and low-crosstalk on-chip communications
Preamplified Demodulation of 56-Gb/s WDM-DPSK Signals by an AWG-Based InP PIC
No full textA compact preamplified receiver for wavelength division multiplexed-diffferential phase shift keying (WDM-DPSK) signals based on Gaussian filtering is proposed and simulated, and a first implementation, including an semiconductor optical amplifiers (SOA) and an ad-hoc arrayed waveguide grating (AWG), is demonstrated by monolithical integration in an InP platform. The demodulation of 56-Gb/s channels on the eight 100-GHz-spaced AWG outputs is experimentally reported, and simulation results show the feasibility of multiwavelength operation obtaining simultaneous demultiplexing and demodulation of all the channels. The resilience to chromatic dispersion for the Gaussian filter demodulation is also shown by simulations
Engineering of closely packed silicon-on-isolator waveguide arrays for mode division multiplexing applications
No full textOn-chip optical communications require high-performance, energy-efficient, and scalable multiplexing techniques for enabling high parallelism. Mode division multiplexing (MDM) is gaining momentum, but its scalability is limited by the crosstalk and the (de)multiplexing complexity. To overcome such limitations, this paper proposes the exploitation of super-modes in closely spaced arrays of waveguides. A theoretical approach demonstrates the generation of super-modes achieved by perturbing the uniformity of waveguide arrays. Spectral characterization shows a crosstalk of about -20 dB on the C band, in a nonuniform array of five silicon-on-isolator waveguides
Microring-Based Fully Integrated Silicon DQPSK Receiver
No full textAn ultra compact integrated silicon receiver for differential quadrature phase shift keying signals based on two tunable silicon-on-insulator microring resonators and four integrated germanium photodetectors is demonstrated. The device is experimentally characterized and the receiver operation is reported for signals ranging from 10 to 20 GBd
Orbital Angular Momentum Generation with Ultra-Compact Bragg-Assisted Silicon Microrings
No full textA silicon microring resonator with an embedded Bragg grating for orbital angular momentum (OAM) generation is designed and experimentally demonstrated. The device consists of a 3.9 μm-radius ring resonator with cylindrical silica holes along the central path and exploits the radially polarized component of the propagating electric field in the resonator's strip waveguide, enabling both the bandwidth broadening and the emission efficiency improvement, while reducing the footprint. The experimental results show that the device achieves a 3dB bandwidth of 134 GHz and an efficiency up to 6.5%. The interference patterns are measured for different OAM orders in which the number of spirals are clearly visible proving that the device can support different topological charges. Results are in good agreement with simulations
A fully integrated DQPSK receiver based on Compact Silicon-on-Insulator Micro-Ring
No full textWe demonstrate an ultra compact integrated Silicon receiver for DQPSK signals based on two tunable SOI microring resonators and four Germanium photodetectors. The device operation was characterized on a range extending from 7.5 to over 15 Gbaud
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