Exfo PSO-200 Optical Modulation Analyzer Manual do Utilizador descarregar pdf (Página 104)

100

101

Bit Pattern Analysis and the Gearbox

96 PSO-200

Performing Detailed Bit Pattern Analysis with the Gearbox

The second column represents the bit delay. In optical systems with

ultra-high bit rates, a difference of a few millimeters in fiber length

between modulators can lead to bit delays and misalignments. The

Gearbox can compensate for these induced delays.

To better understand, here is an example:

Input stream:

As received at modulator inputs (time sliced):

In this example, the Y0 input receives bits with a delay of one “word”. In

this case, the second column in the configuration file should be as follows:

X0= 3 0

X1= 2 0

Y0= 1 1

Y1= 0 0

Note: The first symbol identified will be in the time slice corresponding to the

greater delay value (t=1 in the above example).

1 1 0 1 0 1 01 1 0 1 1 1 1 0 0 1 1 1 1 0 0 0 0

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 284 285

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