Continuous adjustable high-precision wide-range optical delay system

Abstract

The invention relates to the field of optical devices, and discloses a continuously adjustable high-precision wide-range optical delay system, which realizes continuous adjustment of any optical path and seamless connection of the optical path so as to obtain a larger scanning range and higher delay precision. The system comprises a controller, an optical path multiplication device, an optical path switching assembly and an adjustable optical fiber delay instrument, the optical path multiplication device is provided with an optical switch, the optical switch sequentially achieves switching of optical paths L1, L2,..., Ln under the control of a controller, and along with switching of the optical paths L1, L2,..., Ln, the controller can further control an optical path switching assembly to switch a specified adjustable optical fiber delay instrument into a system optical path and switch a non-specified adjustable optical fiber delay instrument out of the system optical path. The delay amount of the cut-out adjustable optical fiber delay instrument needs to be returned to zero before the adjustable optical fiber delay instrument is cut into the system next time. The continuously adjustable high-precision wide-range optical delay system is suitable for optical transmission control.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a continuously adjustable high-precision wide-range optical delay system. Background technique [0002] In recent years, optical fiber transmission has been widely used and developed rapidly in the field of communication. The research and application of various optical fiber devices have also emerged. As a new signal processing device, the Fiber Delay Line (FDL) has developed from a simple section of optical fiber to an independent device with multiple complex structures at the present stage, and has become one of the key devices in optical information processing technology. Various signal processing functions, such as participating in the acquisition and transmission of measurement signals in optical fiber sensing and optical measurement systems, realizing signal encoding and buffering in optical fiber communication systems, and realizing accurate microwave signals in optically c...

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Problems solved by technology

[0004] 1. The incrementally adjustable delay line has a large delay range, but it is non-continuously adjustable;

[0005] 2. The adjustment accuracy of the continuously adjustable delay line is high, but the delay range is usually small, usually below several hundred ps;

[0006] 3. The connection loss of the delay line is large and the precision is low

[0008] Chinese patent CN103746745A discloses a large-range optical delay device, such as figure 1 As shown, it is formed by connecting a step-type optical path multiplication device 110 and a continuous optical path scanning device 120 through a transmission fiber 130; wherein the step-type optical path multiplication device 110 consists of n different delay optical paths a0 and a1 with fixed lengths ...... an, the optical path of the delay optical path is L0, L1..., Ln respectively, L0=0, n=0, 1, 2,..., the step-type optical path multiplication device 110 is equipped with an optical switch, in the optical Under the control of the switch 111, it can be used individually or in cascade to realize the switching of fixed optical paths L0, L1..., Ln of different delay optical paths in sequence. Although it can realize the continuous expansion of any optical path, it belongs to stepping when the optical path is extended. type expansion, because he only uses two 1×n optical switches for segment selection, and the length of the optical fiber to change the optical delay. The delay device 120 in the back is to mediate and compensate the error of the segment delay, and cannot realize stepless continuous The reason is that the optical delay time needs to be realized by increasing the optical distance, and a single optical delay component only increases and decreases the optical distance, and cannot realize the stepless increase of the optical distance, so it can only realize segmental delay

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