研究目的
To implement a pulse-type LADAR system based on heterodyne detection for long-range measurement with high repetition rate, improving receiver sensitivity without the need for a high peak-power laser and a low-noise avalanche photodiode.
研究成果
The proposed pulse-type LADAR system based on heterodyne detection achieves long-range measurement with a high repetition rate, demonstrating potential for real-time 3D imaging with high frame rate for long-range surveillance.
研究不足
The power of the optical LO signal cannot be increased above 8.0 mW due to the limited saturation current of the photodetector, preventing the achievement of a perfect shot-noise-limited condition. The interference efficiency is affected by the loss of the 3-dB fiber coupler and the insertion loss of the balanced detector.
1：Experimental Design and Method Selection:
The system uses heterodyne detection with an optical phase-locked loop to generate an optical local oscillator signal.
2：Sample Selection and Data Sources:
A continuous-wave optical signal is pulse-modulated and reflected back from targets.
3：List of Experimental Equipment and Materials:
Includes laser sources, optical switch, erbium-doped fiber amplifier, optical collimator, polarizing beam splitter, quarter-wave plate, free-space to fiber coupler, balanced detector, bandpass filter, and data acquisition board.
4：Experimental Procedures and Operational Workflow:
The pulse-modulated signal is amplified, emitted, reflected from targets, and combined with the local oscillator signal for heterodyne detection.
5：Data Analysis Methods:
The amplitude of the interference signal is extracted using envelope detection, and the propagation delay is calculated for distance measurement.
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SFL1550P
SFL1550P
Thorlabs
Laser source for generating the optical local oscillator signal.
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PDB480C-AC
PDB480C-AC
Thorlabs
Balanced detector for detecting the interference signal between the received optical signal and the local oscillator signal.
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F180APC-1550
F180APC-1550
Thorlabs
Optical collimator for emitting the optical signal.
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PBSW-1550
PBSW-1550
Thorlabs
Polarizing beam splitter for the optical circulator.
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WPQ10M-1550
WPQ10M-1550
Thorlabs
Quarter-wave plate for the optical circulator.
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GBE05-C
GBE05-C
Thorlabs
Beam expander used as the telescope.
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PAF2A-18C
PAF2A-18C
Thorlabs
Free-space to fiber coupler for receiving the optical signal.
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Koheras E15
E15
NKT Photonics
Continuous-wave laser source with an ultranarrow linewidth for generating the optical signal.
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BOA1004P
BOA1004P
Thorlabs
High-speed optical switch for pulse-modulating the optical signal.
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VOA50PM-APC
VOA50PM-APC
Thorlabs
Variable optical attenuator for adjusting the peak power of the pulse-modulated optical signal.
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PM100D
PM100D
Thorlabs
Optical power meter for measuring the optical power.
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CTL200
CTL200
Koheron
Laser diode controller for tuning the optical frequency of the local oscillator signal.
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VHF-440+
VHF-440+
Mini-Circuits
Bandpass filter for filtering the output of the balanced detector.
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