Understand the types and characteristics of cassette optical systems

A cassette optical system is a system that transmits signals by optical means. It is composed of a transmitter (light source) and a receiver (photodetector), and transmits the light signal through an optical fiber or a light guide tube. Card optical system is divided into single-mode card and multi-mode card, the following will introduce their characteristics.

Single mode cassette optical system

The single-mode cassette optical system uses single-mode fiber for transmission, and the beam diameter is only a few microns, which can transmit higher quality signals, which are characterized as follows:

1. Broadband and high speed: The bandwidth of single-mode fiber is large, and the transmitted information bandwidth is also large, supporting high-speed data transmission.

2. Long-distance transmission: the beam diameter of single-mode fiber transmission is small, the loss of signal transmission is small, and the transmission distance of single-mode fiber can be up to tens of kilometers to hundreds of kilometers.

3. Low noise: The diameter of the beam transmitted by single-mode fiber is small, which can reduce the multiple scattering of the beam in the fiber and the absorption and scattering of the fiber itself, and the transmitted signal is less noisy.

4. Multiplexing: Single-mode fiber allows light to be transmitted at different wavelengths, so optical wavelength division multiplexing and optical time division multiplexing can be achieved to improve channel utilization.

Multimode cassette optical system

Multi-mode cassette optical system uses multi-mode fiber for transmission, the beam diameter is large, can transmit high-power signals, its characteristics are as follows:

1. Economical and practical: multi-mode fiber has a lower manufacturing cost than single-mode fiber, and is suitable for short-distance transmission applications, such as data transmission in computer rooms, metropolitan area networks, etc.

2. Simple and easy to use: Due to the large beam diameter, the connection, installation and maintenance of multi-mode fiber is relatively simple compared with single-mode fiber.

3. Sub-mode multiplexing: Without increasing the transmission distance, multi-mode fiber can transmit different signals in different frequency bands to achieve sub-mode multiplexing and improve channel utilization.

Advantages ofcard optical system

1. The cassette optical system transmits signals through light, without electromagnetic interference, and the transmitted signals are stable and reliable.

2. The optical fiber itself is light in weight, small in size, easy to lay, and can be laid in the city for ultra-long distances.

3. Optical transmission speed is fast, information bandwidth is large, suitable for high-speed data transmission.

4. Small loss, easy to expand, can achieve large-scale signal transmission.

5. The cassette optical system has low radio wave radiation and will not affect human health.

In short, the cassette optical system has the advantages of fast transmission speed, long distance, easy expansion, security and stability, and has become an important part of large-scale communication network, which is widely used in traditional communication field and modern information technology field.