Wavelength Division Multiplexing Optical Telecom System - WDM

The main advantage of this model is its educational value. It allows students to understand the different parts of an Optical Telecommunication (from signal transmission to reception, including their encoding on an optical carrier or their transmission through an optical fiber). More than fifteen hours of possible experiments during which users can study each part separately (modulation by electro-optic effect, fiber coupler, multiplexing and demultiplexing, ...) but also learn optical alignment techniques and fiber injection.

This product was developed in collaboration with LPro Telecom and the XLIM Institute in Limoges.

Topics covered:
- Direct modulation of a beam by a laser diode
- Indirect modulation of a laser beam by electro-optic effect (Pockels effect), light polarization
- Injection and transmission of a signal in an optical fiber, fiber coupler
- Wavelength division multiplexing (WDM), demultiplexing
- Demodulation, optical transmission of video and audio signals

Principles and objectives:
Wavelength division multiplexing consists of transmitting multiple channels at different wavelengths in the same conduit, an optical fiber, each carrying information. The modulated channels are multiplexed at transmission and demultiplexed before detection. Wavelength division multiplexing allows for a higher data rate transmission in an equivalent line fiber than a system transporting only one channel. The main objective of this lab is to address and study the different parts of an optical telecommunication link: from encoding a signal on an optical carrier to its reception, through its transmission and detection.

Composition:
▪ 1 green laser diode 532nm - 5 mW - (ref.205166)
▪ 1 red laser diode 670nm - 3 mW modulable up to 50 MHz (ref.205121) with its support (ref.202434)
▪ 1 power supply for modulable laser diode (ref.205122)
▪ 3 injection supports on rod with 2-axis X-Y adjustments and micrometric translation
▪ 3 precision microscope objectives 10X (ref.571430)
▪ 1 electro-optic modulator (Pockels cell, LiNbO3 crystal) with 2 SMA-SMA cables
▪ 1 generator-amplifier for Pockels cell control
▪ 2 amplified detectors with adjustable gain
▪ 1 multimode fiber coupler 2X1 achromatic connectorized FC/PC
▪ 1 multimedia kit (radio + speakers and all the connections)
▪ 2 laser safety glasses (ref.202630)
▪ 1 experiments manual