Multi-wavelength dmd measurement apparatus and methods

A differential mode delay measurement system for an optical fiber, comprising:

• an optical test fiber with a plurality of modes;
• a single mode tunable laser that transmits a continuous light wave signal to a modulator unit;
• and
• a pulse generator that provides an electrical pulse train signal to the modulator unit and a triggering signal to a receiver,
• wherein the modulator is configured to generate a modulated optical test signal through the multimode fiber based at least in part on the received light wave and pulse train signals, and
• the receiver is configured to receive the test signal transmitted through the fiber and evaluate the test signal based at least in part on the triggering signal.

A method of measuring optical properties of an optical fiber with a plurality of modes, comprising the steps:

• directing a single mode, continuous light wave signal to a modulator;
• directing an electrical pulse train signal to the modulator;
• directing a triggering signal to a receiver based at least in part on the electrical pulse train signal;
• generating a modulated optical test signal based at least in part on the light wave and pulse train signals;
• transmitting the modulated optical test signal through an optical test fiber;
• receiving the modulated optical test signal transmitted through the optical fiber;
• and
• evaluating the received test signal based at least in part on the triggering signal.