@Article{PanasiewiczJrMoraPach:2015:PhQPMo,
author = "Panasiewicz Junior, Jognes and Morais, D. M. S. and Pacheco, G.
M.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)}",
title = "A photonic QPSK modulator aimed at space applications",
journal = "Progress in Electromagnetics Research Symposium",
year = "2015",
volume = "2015",
pages = "99--103",
month = "Jan.",
abstract = "This paper addresses the subject of the satellite payload signal
transmission and the digital-microwave link. Usually, the carrier
modulation data transmitter (DT) employs in-phase (I) and
quadrature-phase (Q) processing to achieve phase shift keying
(M-PSK). Typically, this I/Q processing is obtained by multiplying
a low-frequency reference signal. Such systems usually have many
stages of multipliers, amplifiers and filters. As a result the
microwave transmitter is complicated, bulky and costly. The
results presented are based on a photonic circuit that achieves
QPSK modulation directly at the microwave frequency carrier. The
QPSK modulation was performed using a carrier frequency of 2GHz
and 2Mbps I/Q signal from a pattern generator using a photonic
circuit with a pair of Mach-Zehnder optical modulators arranged in
a parallel configuration. The source of the photonic circuit is a
DFB diode laser with a wavelength equal to 1550 nm. The modulated
optical signal direct detection comes from an InGaAs photo
detector. The optical modulator circuit output can be directly
connected to the high power amplifier (HPA) and the transmission
antenna. The resulting system enables one to achieve a microwave
data transmitter with a reduced mass and volume, further lowering
power consumption. These achievements are very important for
spacecraft engineering teams during the conception of the
satellite payloads when starting a new satellite project. Gamma
radiation and thermal effects of the space environment are also
discussed.",
issn = "1559-9450",
language = "en",
urlaccessdate = "02 maio 2024"
}