OPTICAL transmission of digital information has spread widely in recen
t years, This rapid deployment has left many engineers desperately sea
rching for information regarding the appropriate methods and equipment
that are required to comply with a body of complex standards. Long af
ter the committees have cast their ballots, newcomers who did not part
icipate must struggle with committee recommendations without exposure
to their debates and detailed analysis. With some risk, trial and erro
r, as web as some research, many engineers and technicians find their
way to some suitable methods to satisfy the requirements, Gaining expe
rtise and producing a successful implementation-can be a time-consumin
g task, Fortunately, what follows may help engineers to better underst
and some time-domain test requirements for optical data transmissions
and how to test them with a specialized oscilloscope and an optical re
ference receiver.