Detection device for photon-assisted detection of weak radio frequency signals and detection method thereof

Abstract

The invention discloses a detection device for photon-assisted detection of weak radio frequency signals and a detection method thereof, and relates to the field of photoelectricity. The detection device comprises a semiconductor laser with a relaxation oscillation peak changing along with the change of bias current, output light of the semiconductor laser is amplified after passing through an erbium-doped fiber amplifier, the amplified output light is converted into an electric signal through a photoelectric detector, after the electric signal passes through a 5: 5 electric power divider, half of the signal is output to a frequency spectrograph for observation, and the other half signal is input to one input port of the 5: 5 coupler, the other input port of the 5: 5 coupler inputs a signal to be measured, and the signals and the signal to be measured are loaded to the semiconductor laser together, so that a photoelectric feedback loop is formed. A direct modulation mode is used, an external modulator and an optical filter are not used, the system cost is greatly reduced, the sensitivity of the system is higher, and the frequency tuning is flexible.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to the field of photon-assisted detection of weak radio frequency signals. Background technique [0002] The detection of weak RF signal units has many application scenarios, such as modern radar, wireless communication, radio astronomy, channelization and electronic warfare systems. Traditional electrical methods are difficult to achieve large instantaneous bandwidth and wide detection range. The photon-assisted method provides a potential method for the detection of radio frequency signals due to its small size, wide frequency coverage, low loss, large instantaneous bandwidth, and anti-electromagnetic interference, and has become a research hotspot. Many photonic techniques have been proposed to detect broadband RF signals, such as dispersive elements, finely tunable optical filters, and microwave channelization. However, the sensitivity of these systems is not high enough. [...

AI Technical Summary

Problems solved by technology

However, in the above system, in order to ensure that the low-power RF signal can be modulated onto the optical carrier, it is essential to use a high-sensitivity optical modulator, and other active / passive components also increase the system cost and structure complexity sex

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