Abstract
We propose and experimentally demonstrate a novel and simple approach to identifying both the direction and value of Doppler frequency shift (DFS) in this paper. A pair of phase modulators, as well as a dispersion medium in between them, are employed in the approach. The different dispersion-induced phase shifts of the upper and lower sidebands after passing the dispersion medium can be used to determine the direction of DFS. The value of DFS is characterized by measuring the frequency of the output signal from a low-speed photodetector. Experimental results verify the feasibility of the approach. The major advantages of the approach lie in that it can measure both the DFS direction and value while avoids the use of complicated modulators and additional reference signal, which greatly simplifies the system's architecture.
Highlights
We propose and experimentally demonstrate a novel and simple approach to identifying both the direction and value of Doppler frequency shift (DFS) in this paper
The Doppler frequency shift (DFS) induced by the movement between the target and observer is an important parameter for measuring the target speed, which has been found useful in many applications, such as electronic warfare [1], satellite laser communication [2], and radar system [3]
The first-order upper sideband (USB) of the transmitted and echo signals are around 1549.7920 nm, and the first-order lower sideband (LSB) are around 1549.4720 nm, respectively
Summary
The Doppler frequency shift (DFS) induced by the movement between the target and observer is an important parameter for measuring the target speed, which has been found useful in many applications, such as electronic warfare [1], satellite laser communication [2], and radar system [3]. The first photonic-assisted DFS approach, proposed by Zou et al in 2015 [5], utilizes an architecture with two cascaded electro-optic modulators (EOMs), in which the EOMs, driven by the transmitted and echo signals respectively, are configured to implement carrier-suppressed double-sideband modulation and conventional double-sideband modulation with optical carrier. This approach can effectively determine the value of DFS, but leaves the direction of DFS still uncertain.
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