Table of Contents
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Overview
- Passive muxes, as the name implies, are unpowered, unmonitored devices
- Sometimes called filters
- Passive muxes allow you to combine and split apart many frequencies of light on one fiber pair
Details
- Filtering technology
- Inside of a mux one of these three technologies is used to filter frequencies of light
- Fiber Bragg Grating
Thin Film Filter
Arrayed Waveguide Grating
- Inside of a mux one of these three technologies is used to filter frequencies of light
- Channels - CWDM vs DWDM
- ITU
- Standards for channel width and numbering for each frequency
- In the c-band (DWDM, diagram here Optical: Dense Wavelength-Division Multiplexing (DWDM) Channels) this is typically 100GHz spacing for passive filters
- See Optical: Coarse Wavelength-Division Multiplexing (CWDM) Channels
- See Optical: Dense Wavelength-Division Multiplexing (DWDM) Channels
- ITU
Overview
- Passive muxes, as the name implies, are unpowered, unmonitored devices
- Passive muxes allow you to take one fiber pair and break it out into channelized ports allowing for many channelized optics to be used on on pair of fiber
CWDM Example
- Example diagram:
Add/Drop Design Example
- Example diagram
- In this example each location on the add/drop path has two circuits - one east and one west (color coded)
- Each lateral is folded, so keep in mind that
- A fiber cut on a lateral would take down the location served by the lateral AND all other locations served on the add/drop path would see one of their two paths go down
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