This simulator follows four color-coded infrared channels (1310, 1490, 1550 and 1625 nm) through a filter multiplexer, a common fiber and a demultiplexer. Detune one source, change the filter width, loss and fiber length, and inspect wanted power and leakage at each receiver port.
• A 3D link with four wavelength sources, a thin-film filter multiplexer cutaway, a shared fiber, an equivalent filter bank, four receiver ports and a channel-power monitor. • Twelve controls: the channel to inspect, its wavelength shift, filter FWHM, per-source power, common fiber length, multiplexer and demultiplexer loss, four source enables and a marker toggle. • Nine readouts including inspected wavelength, total enabled power, common-fiber output, wanted power, leakage at the port, all-on power, instantaneous pattern power and the wanted-to-unwanted ratio. • Four guided experiments, a verification bench, Curves & measurements and a Learn & assess tab.
Each demultiplexer port is an equivalent Gaussian filter centered on its channel, with raw transmission Hij = exp[−4 ln2 ((λj − λport,i)/FWHM)²]. Because the filters are passive, each source's contributions are normalized so they cannot sum above one. A source's power on the common fiber is Pon,j · 10^[−(Lmux + 0.2·length)/10], and the power at port i is the demultiplexer loss times the sum of Hij times those powers.
Detuning a source toward its neighbor moves its power to the neighbor's port. Widening overlapping filters raises adjacent-channel leakage, and switching off an interferer removes its contribution from every port.
The simulator uses four infrared bands, an equivalent passive Gaussian filter bank with column normalization, a uniform 0.2 dB/km link and entered insertion losses. It is not a standardized CWDM wavelength plan or a solved thin-film or AWG device, and it excludes dispersion, coherent interference, nonlinear mixing, polarization and noise. Bit markers have illustrative timing without propagation delay.
It lets multiple signals at different wavelengths share a single fiber. A multiplexer combines them, and a demultiplexer uses wavelength-selective filters to route each one back to its own receiver.
Its power no longer matches its own filter, so less reaches its intended port and more leaks to a neighboring one. Shifting a source all the way to 1550 nm sends it predominantly out of the 1550 nm port.
Wide filters overlap adjacent channels, so each port collects more power from neighboring wavelengths. The normalization keeps the passive device from creating power.
No. The four wavelengths are a teaching set of infrared bands and the filters are equivalent Gaussian models, not a standardized wavelength plan.