Abstract
Two new photonics-based microwave frequency translators are presented. They are based on Serrodyne modulation to frequency translate an optical carrier, which beats with a microwave signal sideband at a photodetector to generate a frequency translated microwave signal. The proposed frequency translators have a simple structure, a wide bandwidth and a large spurious signal suppression ratio. Experimental results are presented for the novel structures, which demonstrate the realisation of microwave signal frequency translation with >38 dB spurious signal suppression over a wide microwave signal frequency range of 2 to 18 GHz and with >35 dB spurious signal suppression for a translation rate of 500 Hz to 3 MHz. Frequency translation of an 80 MHz bandwidth frequency modulated continuous wave signal at 5.88 GHz frequency with >34 dB spurious signal suppression is also demonstrated.
Highlights
Microwave signal processing involves modification of the amplitude, frequency or phase of a microwave signal
Experimental results are presented for the novel structures, which demonstrate the realisation of microwave signal frequency translation with >38 dB spurious signal suppression over a wide microwave signal frequency range of 2 to 18 GHz and with >35 dB spurious signal suppression for a translation rate of 500 Hz to 3 MHz
Two new microwave photonic frequency translators have been presented. They are based on a DPol-dual-drive Mach Zehnder modulators (DDMZMs) or a DP-DDMZM, followed by an optical bandpass filter (OBPF)
Summary
Microwave signal processing involves modification of the amplitude, frequency or phase of a microwave signal. It is difficult to design a mixer that produces a frequency-translated signal with small adjacent spurious signals Such requirement is important in ECM systems in order to avoid a radar system knows its signal is being jammed. In addition to electronic warfare and communication, microwave signal frequency translators have applications in reflectometer systems, frequency scanned antennas, frequency comb generators and radar pulse shapers [3], [4] Another technique for modifying a microwave signal frequency is called Serrodyne frequency translation [5]. This is based on using a sawtooth wave to phase modulate a microwave signal. Frequency translation of a microwave signal with a band of frequency is demonstrated
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