Основи Оптичних Мереж

Lightwave Transmission

The core principle is modulating light, typically using laser diodes, to encode data bits. A laser emits a beam of coherent light – meaning all the photons are in phase – which is then launched into an optical fiber.

This modulated light carries information. The intensity or wavelength of the light can represent 0s and 1s, similar to electrical signals. Precise control over these parameters allows for reliable data transmission.

Refraction and Total Internal Reflection

The refractive index of a material describes how much it bends light. A higher refractive index means the light will bend more when passing from one medium to another.

Total internal reflection occurs when light traveling from a denser medium (like glass) strikes the boundary with a less dense medium (like air) at an angle greater than the critical angle. This causes the light to be reflected back into the denser medium, preventing it from escaping.

n1 * sin(θ) = n2 * sin(α)

Principles of Optical Modulation

Several modulation techniques are employed, including On-Off Keying (OOK), where the presence or absence of light represents data. More sophisticated methods like Quadrature Amplitude Modulation (QAM) use both phase and amplitude to encode multiple bits per symbol.

The choice of modulation technique depends on factors such as distance, bandwidth availability, and desired data rate.

Bit Rate = Symbol Rate * Number of Symbols per Bit

Optical Components

Optical networks consist of various components: transceivers (converting electrical to optical and vice versa), multiplexers (combining multiple signals onto a single fiber), and amplifiers (boosting the signal strength).

These elements work together to create robust, high-capacity communication channels. The simulation allows you to experiment with these components and their impact on network performance.

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