1830 PSS/PSI-L Optical Line Systems

Reconfigurable optical add/drop multiplexers (ROADMs) and Wavelength Selective Switches (WSS) complement WDM multiplexing with the ability to selectively add/drop any wavelength, or many wavelengths, of any speed and spectral width, and enable wavelength switching between multiple optical fibers and directions.

WDM multiplexing combines multiple wavelength-specific coherent optics into a single optical fiber, thus increasing the total data-carrying capacity of an optical fiber one hundredfold compared to single-wavelength operation.

C+L band operation expands the optical fiber spectrum available for the transport of coherent wavelengths, and doubles the total WDM capacity of an optical network. WDM multiplexing, optical amplification, and ROADM/WSS functions are supported in C-band and L-bands, and can be combined to provide continuous operation across both C+L bands.

Optical amplifiers boost the power levels of the wavelength travelling across an optical fiber, increasing reach in a highly cost and power efficient manner. Erbium-doped optical amplifiers (EDFAs) allow end-end optical connections to be extended over a thousand kilometers, and can be complemented with Raman amplification to extend optical connections even further, over many thousands of kilometers.

Dynamic gain equalization (DGE) integrated into optical amplifiers and ROADMs ensures that the power levels of all WDM channels operate within optimized limits to maximize performance.

Optical Protection Switching (OPS) supports rapid re-direction of a single or multiple channels to an alternative fiber path. This provides 1+1 traffic protection against fiber cuts or line-side equipment failure, while reducing network cost by avoiding the need for duplicate 1:1 transport interfaces.