Page 10
MTN003813_D02
PDB2xx Series
3 Operating Instructions
· Avoid etalon effects (interference fringes caused between two optical surfaces) in optical
paths. Using angle polished optical connectors will greatly reduce etalon effects in a fiber
based setup. Effects like residual frequency modulation, polarization noise, polarization
wiggle or spatial modulation can also degrade common mode noise suppression. For further
details contact Thorlabs. In general, reducing sources of differential losses in the optical
paths (other than the measurement itself) will improve the common mode noise reduction.
· Please note, that the PDB2xx Series Balanced Amplified Photodetectors are very sensitive to
unwanted stray light. Carefully shielding of the Balanced Amplified Photodetectors from any
unwanted light sources is essential.
· Electrostatic coupling of electrical noise associated with ground loops will introduce electrical
noise. In most cases an electrically isolated post (see Thorlabs parts TRE or TRE/M) will
suppress electrical noise coupling. Always try to identify the electrical noise sources and in-
crease the distance to the PDB2xx Series Balanced Detector. Different common ground
points can also be tested.
To Next Page
Loading...
Need help?
General
