**Current Status of Optical Communication Technology**

**Current Status of Optical Communication Technology**

Optical communication systems primarily consist of optical transmitters, optical fiber waveguides, and optical receivers. To achieve high-capacity transmission, various technologies have been developed—including high-speed modulation of semiconductor lasers, high-speed semiconductor detection, external modulation, wavelength division multiplexing (WDM), dense wavelength division multiplexing (DWDM), and optical phase modulation and demodulation. Furthermore, long-distance information communication has been realized through the application of technologies such as ultra-low-loss optical fibers, high-power semiconductor lasers, high-sensitivity semiconductor detectors, optical amplifiers, coherent optical communication, and optical soliton communication. Currently, the bandwidth of optical fiber communication has expanded from tens of MHz to the THz range, and transmission distances have grown from tens of kilometers to over 10,000 kilometers.

Future Development Trends in Optical Communication Technology

After decades of development, fiber-optic communication technology has gradually matured; however, to meet the demands for higher capacity and lower latency, new theories and technologies are still required to support the future advancement of optical communication. Drawing upon practical applications of the technology, this paper outlines the primary future development directions for optical communication.