Siemens SIPROTEC 5 Series Hardware Description page 103

Optical budget
Laser class 1 as per EN 60825-1/-2
Comment:
Numerical aperture (NA = sin θ (launch angle))
1
SIPROTEC 5, Hardware Description, Manual
C53000-G5040-C002-C, Edition 10.2017
3.2 Input and Output Modules of the Modular Devices
Minimum 7.5 dB for 50 μm/125 μm, NA
Minimum 11.0 dB for 62.5 μm/125 μm, NA
With the use of 62.5 μm/125 μm and 50 μm/125 μm optical fibers
Electronic Modules
1 = 0.2
1 = 0.275
103