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The electro-optic (EO) waveguide modulators based on the high EO active polymer are designed and fabricated. We show two types of the EO polymer waveguides. One is the waveguide having traditional core and clad structure, which shows a few volts of the half-wavelength voltage (Vπ) and 50 GHz bandwidth property. Another waveguide is the hybrid type, which is composed of the TiO2 high refractive index...
We present 4-PAM external modulation up to 10Gbit/s using a RSOA with a 3-dB bandwidth of 1.2GHz. By applying pre-equalization we demonstrate 10km 4-PAM transmission at 8Gbit/s with biterror-rate below the FEC limit.
Previously we demonstrated an all-optical modulation format conversion from BPSK to QPSK without employing band narrowing filter. In this report, we propose a complete conversion system with filtering and the performance is numerically confirmed.
Temperature-stable, energy-efficient, and error-free data transmission with oxide-confined 980 nm VCSELs is obtained for bit rates from 25 to over 40 Gb/s across the broad temperature range 25 to 85 °C. The VCSELs are well-suited for board-to-board, chip-to-chip, and on-chip optical interconnects for computer communications.
Vertical cavity surface emitting lasers (VCSELs) are the dominant source for optical data communication links in computer server, data center, and super computer applications. These applications demand higher bandwidth (> 20 Gbps), longer fiber propagation length (> 1 km), and lower power operation. There have been several reports of VCSEL modulation bandwidth in excess of 50 Gbps [1, 2] although...
There has been rapid technical progress in Visible Light Communications (VLC) over the last decade. A consortium of UK universities (Strathclyde, Oxford, Cambridge, St. Andrews, Edinburgh) has been investigating the use of microLEDs for VLC. This paper focuses on improvements to transmitter and receiver that can increase data rate and link margin.
This paper investigates the feasibility of moderate data rate visible light communication using commercial RGB-LEDs as both emitters and detectors. Data rates of 155 Mb/s (uni-directional) and 110 Mb/s (aggregate bi-directional) were demonstrated.
Recently introduced Stretched Modulation Distribution is used to study tolerance to non-idealities in time bandwidth engineering systems that employ nonlinear phase operations. In particular, the performance in far field and near field regimes is determined by group delay ripples at lower and higher frequencies, respectively.
A cascade of ROADMs in direct-detection multi-band (MB) OFDM metro networks employing virtual carriers is analyzed numerically. Results indicate that, for a 3-band MB-OFDM network with 40 km-spans, 26 ROADMs can be traversed with BER<10−3.
We discuss metasrufaces and metamaterials with exotic optical properties, which can provide giant nonlinear, nonreciprocal or parity-time symmetric response. Our findings can largely relax the limitations on bandwidth and losses of conventional optical metamaterials.
Intensity modulators using substrate-removed waveguides and loaded line traveling wave electrodes are presented. 10 mm and 5 mm long electrode devices have 0.77 V and 1.54 V Vπ and bandwidth exceeding 67 GHz at 1550 nm.
Using the spectral coherence properties of temporally modulated incoherent fields, a novel optical pulse shaping approach for obtaining a fully coherent optical waveform with a customized temporal shape from a time-gated incoherent light source is introduced and numerically demonstrated.
Combining quantum well intermixing and multiple die bonding a broadband superluminescent III-V on silicon LED was realized. Balancing four LEDs with different band gaps resulted in 292nm 3dB bandwidth and an on-chip power of −8dBm.
Hybrid sources consisting of 450nm InGaN LEDs with capillary-bonded micron-thick multi-quantum-well color-converting membranes are reported. Such sources are attractive for visible light communications and a 540nm-emitting hybrid LED having a 57MHz modulation bandwidth is demonstrated.
We demonstrate sub-wavelength grating couplers for both transverse electric and transverse magnetic modes. The couplers are designed for silicon-on-insulator wafer with 220 nm-thick silicon and focusing grating lines have been used to reduce the footprint.
We present an efficient approach for broad band one way propagation of light by parallel and unequal dielectric waveguides leading different effective phase shifts. Three dimensional numerical simulations show that 30% operating bandwidth is achieved.
We report efficient poling of an electro-optic polymer and higher mode confinement in a electro-optic (EO) polymer/TiO2 multilayer slot waveguide modulator. >400-nm-thick EO polymer sandwiched between two 100-nm-tick TiO2 layers shows a mode confinement factor of 68 %, which results in lower half wave voltage (Vπ) of 2.0 V for an electrode length (Le) of 10mm at a wavelength of 1550nm (VπLe product...
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