OCM uses Optical Time Domain Multiplexing to increase the
As shown in the schematic below, this is
accomplished by dividing
the input pulse into two separate legs of a
One leg provides a variable pulse delay and amplitude equalization,
and the other leg, a fixed bit-pattern delay.
The two pulses are then
recombined, interleaving them to produce a
repetition rate of two
times the input rate.
The OCM-4 unit has two cascaded stages of 2X.
OCM-16 add additional stages of 2X and 4X to the OCM-4.
shown in the schematic, there is an intermediate optical tap, and
OCM-4 can be configured to provide 2X output pulses.
feature allows the researcher to align the experimental setup
When the OCM is operating at 4X output, this 2X intermediate
has unequalized pulses with a reduced input extinction ratio.
Bit Error Rate Testing with PRBS, the input
data pattern is
delayed by Ĺ the pattern length and then recombined to
same PRBS at twice the repetition rate. For the example of
at 10 GHz, the bit-pattern delay in the first stage of the OCM-4
nsec, and 3.2 nsec in the second stage. For researchers who use
several different bit-pattern/pulse-rate combinations, kits are
enabling the user to reconfigure the OCM.