TY - JOUR
T1 - An all-fiber image-reject homodyne coherent Doppler wind lidar
AU - Foroughi Abari, Farzad
AU - Pedersen, Anders Tegtmeier
AU - Mann, Jakob
N1 - This project is mainly funded by the WindScanner project from the Danish Strategic Research Council, Danish Agency for Science -Technology and Innovation; Research Infrastructure 2009; GrantNo. 2136-08-0022. Ingeborg and Leo Dannin Grant for Scientific Research funded the NI computer used in this work.
PY - 2014
Y1 - 2014
N2 - In this paper, we present an alternative approach to the down-conversion
(translation) of the received optical signals collected by the
antenna of an all-fiber coherent Doppler lidar (CDL). The proposed method,
widely known as image-reject, quadrature detection, or in-phase/quadrature-phase
detection, utilizes the advances in fiber optic communications such
that the received signal can be optically down-converted into baseband
where not only the radial velocity but also the direction of the movement
can be inferred. In addition, we show that by performing a cross-spectral
analysis, enabled by the presence of two independent signal observations
with uncorrelated noise, various noise sources can be suppressed and a
more simplified velocity estimation algorithm can be employed in the
spectral domain. Other benefits of this architecture include, but are not
limited to, a more reliable measurement of radial velocities close to zero
and an improved bandwidth. The claims are verified through laboratory
implementation of a continuous wave CDL, where measurements both on a
hard and diffuse target have been performed and analyzed.
© 2014 Optical Society of America
AB - In this paper, we present an alternative approach to the down-conversion
(translation) of the received optical signals collected by the
antenna of an all-fiber coherent Doppler lidar (CDL). The proposed method,
widely known as image-reject, quadrature detection, or in-phase/quadrature-phase
detection, utilizes the advances in fiber optic communications such
that the received signal can be optically down-converted into baseband
where not only the radial velocity but also the direction of the movement
can be inferred. In addition, we show that by performing a cross-spectral
analysis, enabled by the presence of two independent signal observations
with uncorrelated noise, various noise sources can be suppressed and a
more simplified velocity estimation algorithm can be employed in the
spectral domain. Other benefits of this architecture include, but are not
limited to, a more reliable measurement of radial velocities close to zero
and an improved bandwidth. The claims are verified through laboratory
implementation of a continuous wave CDL, where measurements both on a
hard and diffuse target have been performed and analyzed.
© 2014 Optical Society of America
U2 - 10.1364/OE.22.025880
DO - 10.1364/OE.22.025880
M3 - Journal article
SN - 1094-4087
VL - 22
SP - 25880
EP - 25894
JO - Optics Express
JF - Optics Express
IS - 21
ER -