Microwave photonic link dynamic range improvement method and microwave photonic link

Abstract

The invention discloses a microwave photon link dynamic range improving method. The method comprises the following steps: firstly, dividing an optical carrier into two paths; then using two paths of homologous microwave signals to carry out electro-optical modulation on the two paths of optical carriers through two parallel Mach-Zehnder modulators, wherein the phases of the modulated optical signals output by the two Mach-Zehnder modulators are opposite; carrying out space division multiplexing on the two paths of modulated optical signals, and transmitting the obtained space division multiplexing optical signals to a far end through a space division multiplexing optical fiber; and carrying out demultiplexing on the space division multiplexing optical signal at a far end, and carrying outbalanced photoelectric detection on the two paths of demultiplexed modulated optical signals to obtain a noise-suppressed microwave signal. The invention also discloses a microwave photonic link. According to the invention, the dynamic range of a microwave photon link can be greatly improved, so that high-stability long-distance transmission of optical signals is realized.

Description

technical field [0001] The invention relates to the field of microwave photon technology, in particular to a method for improving the dynamic range of a microwave photon link. Background technique [0002] Due to its broadband response, low loss, and anti-electromagnetic interference, microwave photonic links have broad application prospects in radar, wireless communication, and spectrum cognition. Dynamic range is an important indicator of link performance. The development of technologies in related fields has put forward higher and higher requirements on the dynamic range of links. For microwave photonic links, dynamic range is becoming a key factor restricting its application. [0003] There are two ways to increase the dynamic range of the link, one is to increase the third-order intercept point (that is, to suppress nonlinear effects), and the other is to reduce the system noise floor (that is, to suppress system common-mode noise). Among them, the promotion of third...

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Problems solved by technology

However, when the optical signal is transmitted in two independent optical fibers, environmental disturbances and Rayleigh scattering of the optical fiber itself will inevitably introduce random noise between the two channels, making the system difficult to apply to the actual long-distance RoF system middle

In addition, only one of the two channels transmits useful optical modulation signals, which wastes system resources and reduces system efficiency.

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