What are the parameters associated with optical light sources in a link?

 Following are the major parameters associated with optical light sources:

• • • OCh output power
    • OCh wavelength AQ
    • Line spacing
    • Cutoff A (tunable sources)
    • Tunability speed (tunable sources)
    • Spectral width (tunable sources)
    • Line width (light sources)
    • Modulation depth (modulated sources)
    •  Bit rate (max-min) (modulated sources) 
    • Source noise
    • Dependency on bias