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.

2. In current commercial fibers, what wavelength of light has the smallest dispersion? What wavelength of light has the least loss?

Answer: The light with the wavelength of 1310nm has the minimum dispersion, and the light with the wavelength of 1550nm has the minimum loss.

3. According to the change of the refractive index of the fiber core, how to classify the fiber?

Answer: It can be divided into step fiber and graded fiber. The step fiber has a narrow bandwidth and is suitable for small-capacity short-distance communication; the gradient fiber has a wider bandwidth and is suitable for medium and large-capacity communication.

4. According to the different modes of transmission light wave in the fiber, how is the fiber classified?

Answer: It can be divided into single-mode fiber and multi-mode fiber. The core diameter of single-mode fiber is about 1~10μm, and at a given operating wavelength, only a single fundamental mode is transmitted, which is suitable for large-capacity long-distance communication systems. Multimode fiber can transmit light waves of multiple modes, and the core diameter is about 50~60μm, and the transmission performance is worse than that of single mode fiber.

When transmitting the current differential protection of multiplexing protection, multi-mode fiber is often used between the photoelectric conversion device installed in the communication room of the substation and the protection device installed in the main control room.

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