OTDR
Which wavelength, 850 or 1550, would be more affected by bending?
1550; the longer wavelength (lower frequency) gets more attenuated
the power of a fresnel reflection is how many times higher than (normal) backscatter
40,000 times (causes blind spot)
The minimum detectable distance between two fresnel reflections is called the:
Event Dead Zone
A typical OTDR can measure both single mode and multimode cable simultaneously (T/F)?
False; u must use different modules
A crappy connection will give a higher/lower reflectance reading
Lower.(This is 'return loss')
________ __________ is the major cause of attenuation in fiber
Rayleigh Scattering
A ghost reflection might be caused by an overpolished connector (T,F)
True: there is an air gap in the connector pair at the original event
Loss measurements are always made from what to what portions of the trace
backscatter to backscatter
The Event Dead Zone is always longer/shorted than the Attenuation Dead Zone
event is shorter
When light encounters a different density medium, a___________ _________ occurs
fresnel reflection
When expressing the 'dynamic range' of an OTDR, a higher number (dB's) means /longer/shorter fiber length capability
higher range= longer
The five parts of an OTDR are:
laser, coupler/splitter, optical sensor,controller, display
1550 nm light has greater/lesser attenuation than light at 850 nm
lesser
The LSA method is used for measuring:
point loss
What determines the length of a blind spot?
pulse width
________pulse to test short;_______pulse to test long
short;long
The number of measurements(data points) per kilometer is called the:
spatial resolution
a coupler/sensor has how many ports?
three; laser source, fiber under test out, fiber under test back
A ghost reflection will indicate how much of a loss (typically)
zero loss
If a new fiber with a different IOR is encountered at a splice, a "_______ ______" may be indicated
"Gain Splice"