High-speed four-level quantum phase modulation driving system

Abstract

The invention discloses a high-speed four-level quantum phase modulation driving system comprising a random signal generator, a first voltage controlled gain amplifier, a second voltage controlled gain amplifier, a first voltage control circuit, a second voltage control circuit, a broadband resistance network, a power amplifier, a Bais-Tee circuit and an optical phase modulator. The random signal generator is separately connected with the first voltage controlled gain amplifier and the second voltage controlled gain amplifier, the first voltage controlled gain amplifier and the second voltage controlled gain amplifier are connected with the broadband resistance network, the broadband resistance network is connected with the power amplifier, the power amplifier is connected with the Bais-Tee circuit, and the Bais-Tee circuit is connected with the optical phase modulator. The high-speed four-level quantum phase modulation driving system solves the problem of high-speed square wave signal amplification waveform distortion and the problem of a short high level smoothness maintaining time, and generates four-level signals from the electronics to drive the PM to generate four-phase laser so as to reduce optical devices.

Description

technical field [0001] The invention belongs to the field of quantum laser phase modulation, in particular to a high-speed four-level quantum phase modulation drive system. Background technique [0002] With the development of communication technology, especially in the field of secure communication, the demand increases. The superiority of quantum secure communication with absolute security in theory has been paid more and more attention. The working rate of a quantum key distribution system is an important factor in determining its key generation rate, and a higher key generation rate means that it can provide security for a wider range of applications. Therefore, it is of great significance to increase the working rate of the quantum key distribution system. In ordinary single-mode fiber, since the inherent birefringence effect of the fiber will change the polarization state of the photon, a phase encoding scheme is often used. [0003] How to realize random high-speed...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-speed four-level quantum phase modulation drive system for the above-mentioned deficiencies in the prior art. The high-speed four-level quantum phase modulation drive system solves the distortion of the amplification waveform of the high-speed square wave signal higher than 1Gbps problem, and the problem of keeping the high level flat for a short time, from the electronics to generate a four-level signal to drive the PM to generate a four-phase laser, thereby reducing the number of optical devices

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