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The modulation-bandwidth enhancement of VCSELs with a passive optical-feedback-cavity is demonstrated, which enables us to tailor the modulation-transfer function. The 3dB-bandwidth is increased by a factor of 2, reaching far beyond the relaxation-oscillation frequency.
We report a FDML swept laser based on Bi-EDF fiber for the first time. A sweeping bandwidth of 81 nm is achieved. In vivo OCT imaging is presented to justify the feasibility of this work.
Comb switches are used to improve the bandwidth of wavelength-routed optical networks-on-chip (ONoC) without changing the network structure. A method is proposed to determine a minimal size comb MRR with given number of resonance wavelengths.
The demonstration of high power, ultra-low ripple superluminescent diode using multiple quantum-dash-in-a-well layers with variable barrier thickness is reported. The device exhibits >20 mW power, <0.3dB ripple, and >80 nm 3dB bandwidth at ∼1.55 µm.
InGaN micro-light emitting diodes on Si substrates have been fabricated and characterized. Their abilities for micro-display, high modulation bandwidth of 270 MHz and data transmission rate of up to 400 Mbit/s have been demonstrated.
The performance improvement of direct-detection double-sideband OFDM systems achieved by using symbol precoding to reduce the signal PAPR is assessed experimentally. EVM improvement of about 2 dB, and SSMF reach increase of 15% are shown.
This talk will describe modified uni-traveling carrier photodiodes (MUTCs) that have achieved high RF output power and high saturation current. Discrete photodiodes, 4x1 phase matched arrays, and balanced detectors will be discussed.
We demonstrate a high-power and high-linearity photodiode module based on a 1×4 MMI-Splitter and a 4×PD-Array. The module achieved 10 dBm output power at 10 GHz and an OIP3 of >20 dBm at 20 GHz.
We demonstrated a broadband millimeter-wave signal delivery system over an optical fiber using a high-speed optical modulator. The high spurious-free dynamic range of the system is capable of high-capacity radio signal transport.
A low-loss CROW delay line with a weak inter-resonator coupling determined by the Kac matrix is dispersionless and can be easily impedance-matched by adjusting the coupling to the input/output waveguide.
A chromatic dispersion tailored composite Si3N4-SiO2 waveguide microring resonator allows generating significantly broader Kerr optical frequency combs, as compared with an identical conventional Si3N4 microring resonator, under the same optical pumping conditions.
A biologically-inspired mathematical transform for compressing the bandwidth of analog signals is introduced. One of its applications is frequency-selective sampling to minimize the required record length for a given digitizer sampling rate.
Improvement in bit error rate performance of asymmetrically-clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) is achieved through proposed modification by using unipolar encoding. This modification eliminates the 3 dB difference between ACO-OFDM performance and bipolar OFDM.
The MODE-GAP project was established to identify the optimum fiber type for use beyond the capacity crunch. This paper will review some of the key drivers behind the project and analyze the key limits and potential improvements‥
A new method based on the moment generating function is proposed to assess the performance of a direct-detection OFDM optical communication system with radio-frequency I/Q demodulation and its accuracy is validated by Monte Carlo simulation.
A high-linearity balanced photodetector with a record-high RF output power of 16 dBm at 40 GHz is presented. The third order intercept point at 15 GHz reaches 34 dBm. By operating one photodiode in the non-linear regime we observe partial cancelation of intermodulation distortions in common mode.
We demonstrate near-ballistic uni-traveling-carrier photodiodes with record optical-to-electrical bandwidth (325 GHz) under 50Ω loads. By using a flip-chip bonding package, high photocurrent (16 mA) and record-high photo-generated power (−1.8 dBm) at 325 GHz are achieved.
We demonstrate novel photodiodes with large active diameters (55 µm). Under −1 V bias, they achieve high-speed (14 and 22 GHz), and high responsivity (0.25 and 0.9 A/W), at 0.85 and 1.55 µm wavelength operation respectively.
We demonstrate shot-to-shot (at a rate of 20 MHz), broadband (>200 nm), spectrally-resolved (spectral resolution of 0.2 nm) statistical characterization of continuous-wave-triggered supercontinuum in the 1 µm regime, enabled by optical time stretch.
We develop a reduced model using 100 single-shot simulations for the output spectrum from a supercontinuum source using an As2S3 photonic crystal fiber that qualitatively matches the ensemble averaged spectrum expected in an experiment.
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