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Advanced data centers require high throughput I/O processing for servers and storage devices connectivity. Silicon photonics technology offering low-cost, low-power, and high-performance is a promising solution for interconnection applications. In this talk, we will review the latest progress of the highly integrated Silicon photonics devices for 4×25 Gb/s active optical cables and transceivers. This...
We demonstrate power-efficient noise-insensitive optical waveform generation from directly modulated lasers combined with periodic time-frequency windowing. Real-time experiments with direct FPGA-driven lasers achieve near-theoretical communication performance at Gbit/s rates using flexible and scalable transceiver designs.
We present a 20 Gb/s monolithically integrated transmitter with stacked CMOS driver and periodic-loaded PN-junction Mach-Zehnder modulator fabricated in IBM's sub-100nm technology node. Transmitter extinction ratios of 10 dB at 20 Gb/s are demonstrated.
25 Gbps operation was obtained with extinction ratios of 2 – 4 dB for Vpp = 1.00 – 1.75 V in MZI modulator consisting of 200-µm photonic crystal slow light waveguide phase shifters.
Optical-path length difference of Mach-Zehnder structures embedded on an optical switch can be adjusted within less than 1.6 % of FSR of the structure, without detecting radiation mode of the structure.
500 MHz surface acoustic waves travel across a commensurate plasmonic grating coupler. A stroboscopic optical technique shows that the dynamic surface deformation deliberately modulates the coupler's efficiency by +/−2% during the ∼ 2ns acoustic cycle.
We propose and experimentally demonstrate a novel, simple and efficient sub-harmonic optical clock recovery technique from RZ-OOK data based on temporal self-imaging, involving temporal phase modulation and dispersion, with a reconfigurable rate division factor.
Using a tape-assist-transfer method and micromanipulation, we have fabricated graphene coated ZnO nanowire (GZN) optical waveguides. The GZNs exhibit significant saturable absorption (differential transmission of 15% at 1064nm), which can be employed for optical modulation.
A low noise multi-carrier generation scheme using optical FIR filter for ASE noise suppressing is proposed. 50 and 69 low noise carriers are generated experimentally, having much higher carrier-to-noise-ratio values of 22.5dB and 19.1dB.
We demonstrate two 1Tbit/s superchannel architectures using a compact, FSR-tunable gain-switched comb source. SSMF transmission of 18GBaud Nyquist-WDM shaped PDM-QPSK and PDM-16QAM modulation is reported, with a capacity up to 1.296Tbit/s and SE of 7.2bit/s/Hz.
We investigate degradation of QPSK CO-OFDM system due to components most susceptible to high PAPR. We vary transmitter design parameters and uncover appropriate working conditions and clipping effectiveness regions.
The generation of optical SSB signals by a Dual-EML is generalized for wideband modulating signals. The feasibility of the proposed technique is demonstrated by transmitting 5.3 GHz baseband OFDM signal in an optical SSB context.
Modulation characteristics enhancement by mutual injection locking of monolithically integrated lasers is demonstrated. Resonance frequency as high as 34.3 GHz is recorded. The nonlinearity and chirp performances are simultaneously improved compared with free running state.
We present a novel method of spatiotemporal optical coherence (STOC) manipulation, in which the effective coherence properties of the optical field are adjusted by modulating the phase of the spectral degree of coherence.
We study He+-induced radiation damage in 10-µm-thick LiNbO3-thin-film modulators. Results show induced-strain, scattering from interstitials, and the degree of overlap between guided modes with damaged region result in degradation of device extinction ratio and VπL.
We propose a reflective phase-only modulator formed by two layers of high-contrast grating reflectors. By arranging such optical phase modulators in a 2D array, ultra-fast Si-based phase-only spatial light modulators can be realized.
We retrieve the thermal dissipation time of τ=0.25µs and investigate the power dependent absorption in a SiN microring resonator. We estimate n2=4.3×10−19m2/W based on clear 1 GHz optical modulation of the refractive index.
A dual-mode, graphene optical modulator and detector for the near-IR is demonstrated in a single device. Gate dependent photocurrent and optical transmission allow the device to operate in a highly novel mode of simultaneous optical modulation and detection.
A Si-integrated modulator based on epitaxial ferroelectric BaTiO3 thin films is demonstrated with gigahertz modulation bandwidth and an effective Pockels coefficient of 213 ± 49 pm/V.
A novel optical single sideband (OSSB) modulation scheme is proposed based on a phase-modulator (PM) and a tunable optical band pass filter (TOBPF) composed by a vertical-cavity surface-emitting laser (VCSEL) and an optical circulator (OC).
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