Tuesday, June 01, 2021 10:45:16 AM
Direct modulation of a laser can only be done for AM (intensity) modulation [NRZ, PAM4, etc]. Direct modulation can not be done for PM (phase) modulation formats [QPSK, QAM, etc]. It is usually considered to be an inferior method of intensity modulation when compared to the performance of external modulators, but I don't know the specifics in this case.
In an earlier post, I discussed different modulation formats and the market segments in which they are most commonly used.
Long story short...intensity modulation is only used in datacenters while phase modulation is predominantly used in telecom (>10kM). Consequently, the II-VI product above would only be useful for datacenter applications.
Hope this helps.
PG
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