Chapter 8
Experimental Investigations and Practical
Circuits of Optoelectronic oscillator (OEO)
with RF FODL
This chapter organizes as follows.
Its first part is devoted to description of OEO experimental investigations. The aid
of these investigations is checking of theoretical calculations fulfilled in Chaps. 3–7
of this book. The other part of this chapter examines the various practical devices of
OEO utilization in the modern equipment.
Basically, problems of experimental investigations here are concerned to the bias
current influence on the OEO oscillations’ frequency and the amplitude (at the
closed feedback loop). In the beginning of Sect. 8.1, there is the description of the
unified OEO experimental workbench. We study obtained experimental characteristics for variations of the bias current of LED, the laser diode and QWLD for the
open feedback loop. Among experimental dependences, we can single out the
following: the phase incursion differences and amplitudes of RF FODL output
oscillations versus the oscillation amplitude at the modulator input; oscillation
amplitude and phase differences at the photoreceiver output for various positions
of output laser diode emission selector; amplitude and phase differences at photodetector in the far zone. Then we conduct the comparison of OEO characteristics at
utilization of LED, usual (not quantum dimension) laser diodes with high threshold
pumping currents and QWLDs with low values of the pumping (or bias) currents on
RF and microwave frequencies.
In Sect. 8.2, the reader is supplied by a series of OEO experimental functions for
the closed feedback loop for variations of DC bias current of LED, the usual laser
diode, and QWLD.
Further, we describe the experimental results for OEO with the phased microwave fiber-optical communication line on the base of the powerful laser for the
active phased antenna array (Sect. 8.3). Then we discuss the main circuit units
including the powerful laser, and examine the specific advantages of OEO application in the system of phased RF signal distribution over various array channels.
Section 8.4 is devoted to OEO experimental investigations in the microwave
range 8–10 GHz. We describe the experimental OEO workbench in the microwave
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2020
A. A. Bortsov et al., Laser Optoelectronic Oscillators, Springer Series in Optical
Sciences 232, https://doi.org/10.1007/978-3-030-45700-6_8
465
Experimental Investigations and Practical
Circuits of Optoelectronic oscillator (OEO)
with RF FODL
This chapter organizes as follows.
Its first part is devoted to description of OEO experimental investigations. The aid
of these investigations is checking of theoretical calculations fulfilled in Chaps. 3–7
of this book. The other part of this chapter examines the various practical devices of
OEO utilization in the modern equipment.
Basically, problems of experimental investigations here are concerned to the bias
current influence on the OEO oscillations’ frequency and the amplitude (at the
closed feedback loop). In the beginning of Sect. 8.1, there is the description of the
unified OEO experimental workbench. We study obtained experimental characteristics for variations of the bias current of LED, the laser diode and QWLD for the
open feedback loop. Among experimental dependences, we can single out the
following: the phase incursion differences and amplitudes of RF FODL output
oscillations versus the oscillation amplitude at the modulator input; oscillation
amplitude and phase differences at the photoreceiver output for various positions
of output laser diode emission selector; amplitude and phase differences at photodetector in the far zone. Then we conduct the comparison of OEO characteristics at
utilization of LED, usual (not quantum dimension) laser diodes with high threshold
pumping currents and QWLDs with low values of the pumping (or bias) currents on
RF and microwave frequencies.
In Sect. 8.2, the reader is supplied by a series of OEO experimental functions for
the closed feedback loop for variations of DC bias current of LED, the usual laser
diode, and QWLD.
Further, we describe the experimental results for OEO with the phased microwave fiber-optical communication line on the base of the powerful laser for the
active phased antenna array (Sect. 8.3). Then we discuss the main circuit units
including the powerful laser, and examine the specific advantages of OEO application in the system of phased RF signal distribution over various array channels.
Section 8.4 is devoted to OEO experimental investigations in the microwave
range 8–10 GHz. We describe the experimental OEO workbench in the microwave
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2020
A. A. Bortsov et al., Laser Optoelectronic Oscillators, Springer Series in Optical
Sciences 232, https://doi.org/10.1007/978-3-030-45700-6_8
465