Picosecond Optical Sampling Research Articles

LiNbO3 waveguide quasi‐phase‐matched sum‐frequency generation device for high‐efficiency optical sampling

AbstractA LiNbO3 waveguide quasi‐phase‐matched sum‐frequency generation (SFG) device is studied. From the design of the device and a study of the sampling characteristic, it is determined that picosecond optical sampling can be realized at high conversion efficiency. A device 5 mm long with a fan‐shaped polarization inversion grating is fabricated for optical sampling experiments. By using the sampling pulse light with a width of 25 ps obtained by gain‐switching operation of a laser diode, the waveform of the signal light at a wavelength of 1.5 μm is observed. Optical sampling at a normalized SFG conversion efficiency of 43%/W is realized. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 84(5): 29–36, 2001

Waveguide quasi-phase-matched sum-frequency generation device for high-efficiency optical sampling

A LiNbO/sub 3/ waveguide quasi-phase-matched sum-frequency generation (SFG) device using a fan out domain-inverted grating for picosecond optical sampling was designed and fabricated. Sampling of signal waves at 1.5-/spl mu/m wavelength by 25-ps sampling pulses generated by a gain-switched laser diode is demonstrated in a device of 5 mm length with a normalized SFG efficiency as high as 43%/W.

Optical sampling using nondegenerate four-wave mixing in a semiconductor laser amplifier

Picosecond optical sampling using nondegenerate four-wave mixing in a semiconductor laser amplifier (SLA) is demonstrated for the first time. High-peak-power pulses and electrical gating of the SLA produce an optical sampling signal with a high signal-to-noise ratio.

Picosecond optical sampling using four-wave mixing in fibre

An all-optical sampling system with 20 ps resolution realised by employing four-wave mixing in a fibre is demonstrated. Using only semiconductor laser sources, picosecond pulses are displayed on a microsecond time scale with a low speed receiver.

Picosecond optical sampling of GaAs integrated circuits

Direct electrooptic sampling is a noncontact optical-probing technique for measuring with picosecond time resolution the voltage waveforms at internal nodes within GaAs integrated circuits. The factors contributing to system bandwidth, sensitivity, spatial resolution, and circuit perturbation are discussed, as are the circuit requirements for realistic testing of analog and digital devices. Measurements of high-speed GaAs integrated circuits are presented, including time-domain waveform and timing measurements of digital and analog circuits and frequency-domain transfer function measurements of microwave circuits and transmission structures. >

Picosecond optical sampling by semiconductor lasers

It is shown that a semiconductor laser driven by short electrical current pulses represents a high-speed gate for external optical signals. Based on this finding a novel sampling technique for the detection of light pulses is demonstrated. Conventional semiconductor lasers can be used as sampling gates in a cross correlation arrangement. The time resolution is observed to be better than 10 ps under appropriate injection conditions of the sampling laser. Computer simulations of the sampling system are carried out in the framework of the rate equation model. The theoretical predictions on the time response and the dynamics of the sampling system agree with the experimental observations.

Picosecond AlxGa1−xAs modulation-doped optical field-effect transistor sampling gate

New modulation-doped Alx Ga1−xAs/GaAs metal-semiconductor field-effect photodetectors have been fabricated and tested in a novel picosecond optical sampling gate configuration. The rise time was measured to be 12 ps, with a full width at half-maximum of 27 ps. The optical electronic picosecond cross-correlation measurement has shown the importance of the two-dimensional electron gas for high-speed operation.

Picosecond optical sampling technique for measuring the speed of fast electro-optic switch/modulators

We propose and demonstrate a new technique for measuring the pulse response of fast electro-optic switch/modulators. Using synchronized trains of electrical drive pulses and picosecond optical sampling pulses, switching times as short as ∼50 psec can be measured without requiring a fast photodiode.

Comments on "Picosecond optical sampling"

An optical sampler recently reported by Vogel et al. is revealed to have been invented six and one-half years previously by Macomber.