Light guidance, transmission & WDM — how optical fiber carries light-encoded data from transmitter to receiver.
Cut away a step-index fiber, launch light at an angle and see the acceptance cone, guided path and escaped power.
Send the same pulse down single-mode and multimode fibers and compare delayed arrivals, chromatic broadening and output width.
Open a fiber-coupled laser transmitter and trace data through the driver, laser chip and lens while threshold and bandwidth shape the light.
Watch photons create carriers in a PIN photodiode, then follow the TIA and comparator that recover the transmitted bits.
Trace light through a fiber spool, connector and splice with a moving power probe and check the power budget margin.
Align two ferrules on a micrometer stage and watch mode overlap, reflection and contamination change coupled power and loss.
Wrap a fiber around an adjustable mandrel and see guided power leak out as radius shrinks and turns accumulate.
Merge four colored infrared channels onto one fiber, then separate them and see wanted power versus leakage at each port.
Build a two-span dense-channel link with a mid-span EDFA and watch gain limits, added ASE noise and OSNR respond.