Transmission method and transmission system of DC reference signal

Abstract

The invention discloses a transmission method and transmission system for direct current reference signals. The transmission system comprises an electro-optical conversion module, a transmission optical fiber and a photoelectric conversion module; the electro-optical conversion module is used for converting multiple input direct current reference signals into multiple direct current reference optical signals with different wavelengths and adjusting optical powers of the output direct current reference optical signals according to the current or voltage strengths of the multiple direct currentreference signals to enable the optical powers to be capable of reflecting the current or voltage strengths of the input direct current reference signals; one end of the transmission optical fiber isconnected with the electro-optical conversion module and used for transmitting the multiple direct current reference optical signals with different wavelengths simultaneously without mutual interference; and the photoelectric conversion module is connected with the other end of the transmission optical fiber and used for converting the multiple direct current reference optical signals with different wavelengths into optical currents and outputting the optical currents. The transmission line integration level is significantly increased while the backward compatibility is achieved and the signalquality is guaranteed, high-precision and high-integration level transmission of the multiple direct current reference signals is achieved, and transmission has the excellent stability.

Description

technical field [0001] The disclosure belongs to the technical field of automatic control and optical communication, and relates to a transmission method and a transmission system of a DC reference signal. Background technique [0002] DC reference signals are fundamental resources in analog circuits. In fields such as precision measurement that have strict requirements on signal accuracy and noise suppression, a high-precision DC reference signal plays a key role. In precision measurement devices, the DC reference signal can be generated directly in the device, or can be input through an external DC reference signal source. Directly generating a DC reference signal in the device is limited by volume, power consumption, design complexity, etc., and it is often difficult to achieve high precision. Precision measurement devices may also be installed in cryogenic chambers, vacuum chambers, etc., and it is impossible to integrate a DC reference signal source inside. Therefore,...

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Problems solved by technology

[0004] However, the traditional DC reference signal transmission is realized by cables, which is susceptible to interference from the electromagnetic environment and geomagnetism, and the transmission accuracy is difficult to improve

[0005] Second, it is easy to transmit a few channels of DC reference signals using coaxial cables. However, when the number of DC reference signal channels required increases, the coaxial cable solution faces great limitations.

On the one hand, in order to ensure a sufficiently small resistance, the effective cross-sectional area of ​​the coaxial cable has certain requirements, and the insulating layer will also increase the cross-sectional area; on the other hand, the connector of the coaxial cable often has a large volume, and these factors limit the integration of coax solutions

For example, superconducting quantum computing requires more than 100 DC reference signal channels for transmission. When the coaxial cable solution is used, this will occupy a large amount of space in the dilution refrigerator, which will bring great difficulties to the installation and maintenance of the entire equipment.

In addition, when some precision measuring devices that need to be installed in cryogenic chambers and vacuum chambers transmit DC reference signals with other devices, using a large number of coaxial cables as transmission lines for DC reference voltage will bring a certain degree of leakage to the cryogenic chamber. hot

For example, in fields such as quantum computing and quantum communication, it is often necessary to place samples at low temperature to reduce thermal noise. The transmission line of the reference voltage will bring a certain degree of heat leakage to the cryogenic chamber, causing an increase in thermal noise, and even affecting the normal operation of the refrigerator or samples at low temperature

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