Fiber Optic 3D Interferometer
Optical fiber interferometer, an instrument that interferes with optical phenomena. The interference phenomenon is the basic phenomenon of optics, and the use of optical fibers to achieve light interference is an important application of the light interference phenomenon. Because the optical fiber replaces the lens system. The optical path is flexible, the shape can be changed at will, the transmission distance is long, and it can be applied to various harsh environments with strong electromagnetic interference, flammability and explosion, etc., so that various interferometers and many functional devices such as fiber optic gyro, Optical switches and optical positioning devices have wide application prospects. Optical fiber Mach-Zehnder interferometer can be used in teaching experimental devices. Students use this device to experiment, not only to deepen their understanding of the phenomenon of optical interference, to understand the factors affecting optical interference, but also to exercise their ability to adjust the optical path and inspire innovation.
To evaluate the spherical radius and fiber height of the end face of an optical fiber connector, you must first measure the shape of the end face of the connector. The interferometer has the advantages of high measurement accuracy, fast speed and low cost, and is an effective method for measuring the surface shape. It is a system overview of the optical fiber connector end detection interferometer. After the light emitted from the light source is reflected by the half lens to the Miro interference objective lens, the light is focused on the end surface of the fiber connector to be detected. camera. At this time, interference fringes can be observed on the CCD camera.
The image measured by the CCD camera is transmitted to the computer for analysis through the image card. You can get the measurement results we need. The PZT (piezoelectric ceramic component) controlled by the computer through the control card and control loop is used to move the Miro interference objective lens to produce phase movement.
The analytical interference fringes can be applied by Fourier transform method 2, 3, 4 or phase shift method 5, 6. The Fourier transform method has the advantages of simple, fast, low cost, etc., but the accuracy is low, and it is generally used for simple measuring instruments. For the measurement of the shape of the end face of the optical fiber connector, the phase shift method with higher analytical accuracy is generally used.
It must be pointed out that the phase connection is a relatively complicated process. Select different phase connection algorithms, the calculation speed and stability will be different.
This product can be used as a teaching experiment to observe optical fiber interference fringes, and can also be used in sensors. Through the change of the fringe, the amount of change in the external influence on the phase is obtained.
Conditions of Use
a dark room; b to prevent vibration; c indoor clean, no dust; d experimental desktop flat; e room temperature.
The total light output is more than 300μW
The linear polarization of the output light is greater than 98%
The number of observable stripes is more than 25
More than 2 stripe movements caused by PZT
The importance of 3D Interferometer
The success of the connection of the optical fiber line depends on the quality of the physical connection of the optical fiber. This physical connection is a function of the geometric size of the end face of the connector itself. If this geometric size is not strictly controlled. Not to mention the long-term reliable connection of the network. Telcordia GR-326 specifies three technical parameters for the connector: radius of curvature, apex offset, and fiber height. If the geometric size cannot meet the requirements, you will face a huge risk of system connection failure. Therefore, it is very important to correctly understand the geometric dimensions of the end faces.
1. Radius of curvature The radius of curvature describes the radius from the axis of the ferrule to the end surface. It can also be described as: the radius of the ferrule end surface curve, the connector presses the pressure of the spring to achieve the close contact of the fiber end surface, and the radius of curvature is to control the compressive force to maintain the fiber center matching force. The failure of the radius of curvature will increase or decrease the pressure of the fiber. Under the effect of aging, it will eventually lead to a matching distance between the center of the fiber and even damage the end face of the fiber. Insertion loss and echo changes will slowly change the loss, the terrible thing is that this can not be accurately simulated by any existing standard methods.
2. Vertex offset Vertex offset is the distance from the highest point of the ferrule end curve to the axis of the fiber core. The apex shift will increase the effective coupling region of the fiber, which will increase the insertion loss and return loss.
3. Fiber height Fiber height is the distance from the end face of the fiber to the end face of the ferrule. The fiber height index is used to measure the contact between the fiber and the fiber. When the material expands or shortens, the fiber sag will form an air gap between the fiber contacts, changing insertion and return loss. The height of the optical fiber increases the pressure between the optical fibers, thereby damaging the optical fiber, or transmits the pressure to the epoxy resin that fixes the optical fiber, thereby destroying the fixation of the optical fiber and affecting the stability of performance. High-quality fiber optic connectors must pass the 3D test. Very few fiber optic connectors currently on the market pass the interferometer test. It is recommended to purchase fiber jumpers and pigtails that pass the 3D test when constructing a high-speed network.
OPTICO COMMUNICATION (www.fiberopticom.com) focuses on the development of fiber optic network communication product lines and provides a comprehensive solution to the fiber connectivity system components. We supply fiber optic components, such as fiber patch cord, fiber adapter, PLC splitter, SFP， fiber transceiver, MTP/MPO, CWDM/DWDM, FTTH solution, Data center wiring solution, etc. All the products adopt strict quality standards in the production and inspection, ensuring excellent operation performance and good product stability, and safely and reliably ensuring the long-term use of products.
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