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First Generation Fiber Optic Communication System

First-generation fiber optic systems operated at 45 Mb/s using 0.85 µm wavelength LEDs with repeater spacing of about 10 km.

Key Features

Bit Rate and Wavelength: The first-generation systems, developed in the early 1970s, transmitted data at a bit rate of 45 Mb/s using a wavelength of approximately 0.85 µm. This wavelength was chosen because early gallium arsenide (GaAs) LEDs were available and could efficiently emit light at this range . Light Source: These systems primarily used GaAs LEDs rather than lasers. Semiconductor lasers were difficult to develop at the time, and LEDs provided a simpler, though less efficient, light source for optical transmission . Repeater Spacing: The optical signal could travel up to 10 km before requiring regeneration by repeaters. This spacing was significantly larger than that of coaxial copper systems, reducing installation and maintenance costs . Transmission Medium: Early systems used multimode fibers, which were easier to manufacture and align with LED sources, though they suffered from modal dispersion that limited distance and bandwidth . Applications and Limitations: First-generation fiber optics were primarily deployed for long-distance telephone communication. While they represented a major improvement over copper networks in terms of bandwidth and immunity to electromagnetic interference, audio quality and data integrity were limited by low bit rates and the need for frequent repeaters . Advantages: Compared to copper systems, these early fiber optic systems offered higher bandwidth, lower signal attenuation, and reduced susceptibility to electromagnetic interference, making them a pioneering step in modern telecommunications . Summary: In essence, first-generation fiber optic systems laid the foundation for optical communication by combining 0.85 µm LEDs, 45 Mb/s bit rates, 10 km repeater spacing, and multimode fibers, enabling long-distance data transmission and setting the stage for subsequent generations with higher speeds, longer distances, and laser-based sources .

First Generation Fiber Optic Communication System - TKMM Photonics Systems Sp. z o.o. [PDF]

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