FAQ

1. What are the two commonly used single longitudinal mode semiconductor lasers? Answer: DFB lasers and DBR lasers are both distributed feedback lasers, and their optical feedback is provided by distributed feedback Bragg gratings in the optical cavity.

1. How many types of fiber optic connectors are commonly used? Answer: According to different classification methods, fiber optic connectors can be divided into different types. According to different transmission media, they can be divided into single-mode fiber optic connectors and multi-mode fiber optic connectors; according to different structures, they can be divided into FC, SC, ST. , D4, DIN, Biconic, MU, LC, MT and other types; according to the pin end face of the connector can be divided into FC, PC (UPC) and APC. Commonly used fiber optic connectors: FC/PC fiber optic connectors, SC fiber optic connectors, and LC fiber optic connectors.

1. What material is used for the cable sheath? Answer: The optical cable sheath or sheath is usually composed of polyethylene (PE) and polyvinyl chloride (PVC) materials, and its function is to protect the cable core from external influences.

1. What is the significance of the numerical aperture (NA) of a step index fiber? Answer: Numerical Aperture (NA) indicates the light-receiving ability of the fiber. The larger the NA, the stronger the light-collecting ability of the fiber.

1. What does "1310nm" or "1550nm" in common optical test instruments refer to? Answer: It refers to the wavelength of the optical signal. The wavelength range used in optical fiber communication is in the near-infrared region, and the wavelength is between 800nm ​​and 1700nm. It is often divided into short wavelength band and long wavelength band, the former refers to 850nm wavelength, and the latter refers to 1310nm and 1550nm.

1. What is the test principle of Optical Time Domain Reflectometer (OTDR)? What is the function? Answer: OTDR is made based on the principle of light backscattering and Fresnel reflection. It uses the backscattered light generated when light propagates in the fiber to obtain attenuation information, which can be used to measure fiber attenuation, splice loss, fiber fault location, and Knowing the loss distribution of optical fibers along the length is an essential tool in the construction, maintenance and monitoring of optical cables. Its main index parameters include: dynamic range, sensitivity, resolution, measurement time and dead zone.

1. Briefly describe the composition of optical fibers. A: An optical fiber consists of two basic parts: the core and cladding made of transparent optical material, and the coating.

With the development of the communication industry, optical communication products to meet various needs have been put into the market. We may know little about the classification of this type of products and their characteristics. So, in today's article, let's take a brief look at one type of product: fiber optic connectors.

Single mode: 8/125μm, 9/125μm, 10/125μm Multimode: 50/125μm European standard; 62.5/125μm American standard

In the current general optical fiber cabling network, because the technology and quality of the optical fibers used in the wiring are generally stable, the characteristics of the optical fibers composed of optical fibers and various optical fiber connectors, jumpers, pigtails and other components are relatively stable. And in the actual use of wiring, they are relatively fixed, so most of the reasons that may actually affect the stability of the optical fiber network are concentrated in the connection technology of the optical fiber.

The continuous popularization of cloud computing, big data technology and applications, and the rapid implementation of artificial intelligence are promoting the transformation of the optical fiber data center industry.

The multi-mode 10 Gigabit optical fiber patch cords produced by Fiber hope have several standards: OM1, OM2, OM3 and OM4. It is widely used in 10 Gigabit fiber optic network systems.

Pigtails are also called bare optical fibers and pigtails. One end of the pigtail has a fiber optic connector, and the other end is a broken end of the fiber optic cable core. Fiber core stubs are fused to minimize insertion loss. The structure of pigtails and jumpers is very similar. In simple terms, the jumper is cut from the middle to form two pigtails. Pigtails have a variety of different connectors, common pigtails are usually 0.9mm in diameter and installed in the ODF unit.

Often customers require optical fiber jumpers with particularly low insertion loss. For example, two days ago, a customer customized APC patch cords, and the insertion loss was less than 0.1dB. Such high-level jumpers can be produced, but the cost is higher than telecom-level jumpers. So is the insertion loss of the optical fiber patch cord as small as possible? the answer is negative.

Optical fiber is short for optical fiber. It is a fiber made of glass or plastic and can be used as a light transmission tool. The transmission principle is'total reflection of light'.