Digital modulation signal source based on microwave photon technology

Abstract

The invention discloses a digital modulation signal source based on a microwave photon technology. In a digital modulation signal source composed of a mode locked laser 101, a luminous intensity modulator 102, a light polarization modulator 103, a tunable polarization correlation light comb filter 111, a tunable light band pass filter 108, a linearity dispersion medium 109 and a photoelectric detection unit 110, the tunable polarization correlation light comb filter 111 is formed by connecting a light circulator 104, a polarization beam splitter 105, programmable polarization mold dispersion units 106-1 and 106-2, and 45-degree Faraday rotators 107-1 and 107-2 in a specific mode, such that independent tunable comb filtering can be performed on mutually vertical linear polarization states, digital modulation signals with different modulation rates, different carrier wave frequencies, different modulation modes and different duty ratios are generated, and the digital modulation signal source can be applied to multiple important fields such as the transmitting end of a super-speed network, a radio-on-fiber system, a military radar and the like.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a digital modulation signal source based on microwave photon technology. Background technique [0002] The use of optical methods to generate microwave signals (especially higher frequency millimeter waves) is a research topic that has recently attracted attention. It can not only generate millimeter waves for optical wireless systems, but also generate near-infrared signals with a frequency up to THz for military radar, imaging detection, etc. The microwave signal is generated by the optical method, which not only breaks through the electronic bottleneck, but also has the advantages of anti-electromagnetic interference, wide range of tunability, low loss, and wide bandwidth. On the other hand, the digital modulation signal source refers to the equipment used to generate digital modulation signals. Commonly used digital modulation signals include binary amplitude modulat...

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Problems solved by technology

In schemes (2) and (3), due to the limitation of spectral shaping, only one modulation mode signal can be generated, which is not suitable for the adjustable generation of multiple modulation mode signals, which limits the development of high-speed dynamic networks

[0004] The above three schemes all realize the generation of millimeter-wave digital modulation signals. In scheme (1), the generation of different digital modulation signals can be realized by changing the optical modulation method, but an external microwave carrier signal is required, and the adjustability is poor; (2) and (3) are both based on frequency domain to time domain conversion technology to generate digital modulation signals, which can realize a wide range of adjustable carrier frequency and duty cycle, but due to the limitation of spectral shaping technology can only generate Single modulation digital modulation signal

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