Title :
Integrated microlaser Doppler velocimeter
Author :
Ito, Takahiro ; Sawada, Renshi ; Higurashi, Eiji
Author_Institution :
NTT Opto-Electron. Labs., Tokyo, Japan
fDate :
1/1/1999 12:00:00 AM
Abstract :
We have developed a microlaser Doppler velocimeter in which the laser diode, photodiode, and optical waveguide are monolithically integrated on a GaAs substrate. This integration eliminates the difficult optical alignment and susceptibility to environmental disturbances which are disadvantages of the conventional laser Doppler velocimeter. Our velocimeter showed good linearity between relative velocity and output frequency, and it can detect very low velocities of less than 5 μm/s. It can also measure the flow speed of a liquid containing particles. Moreover, the addition of a step at the end of the waveguide and one more photodiode enables the phase difference to be used for directional discrimination
Keywords :
Doppler measurement; flow measurement; gallium arsenide; integrated optics; integrated optoelectronics; laser velocimeters; micro-optics; microsensors; optical waveguides; photodiodes; GaAs; GaAs substrate; directional discrimination; environmental disturbances; flow speed; good linearity; integrated microlaser Doppler velocimeter; laser Doppler velocimeter; laser diode; liquid containing particles; microlaser Doppler velocimeter; monolithically integrated; optical alignment; optical waveguide; output frequency; photodiode; relative velocity; susceptibility; very low velocities; Diode lasers; Frequency; Gallium arsenide; Integrated optics; Linearity; Optical waveguides; Particle measurements; Photodiodes; Velocity measurement; Waveguide lasers;
Journal_Title :
Lightwave Technology, Journal of
