Saturday, March 12, 2022 1:24:47 PM
Authors: Dr. Michael Lebby, Karen Liu and Cory Pecinovsky
Electro-Optic Polymers Improve Speed and Power Efficiency
Here are a few notable quotes from the article along with my comments in italics.
Comment: The Pockels Effect changes the electromagnetic field (E-field) around the polymer (voltage-based). E-fields change at the nearly the speed of light, as it is electromagnetic radiation. As such, its response time is incredibly fast.
Comment: The Stark Effect involves "electron flow", i.e., electrical current. All conductors have a property known as inductance. Inductance in electrical systems is analogous to inertia in mechanical systems. This means that it takes time to start moving and to stop moving electrons. Time is our enemy in high-speed communication devices. It degrades the response time of the system. The contrast of response times is on the order of 1000X faster for a polymer modulator exploiting the Pockels Effect vs a Si or InP modulator relying on the Stark Effect. Other factors come into play, so LWLG can't boast a 1000X improvement in response time over Si, but - at least in this regard - it is much better.
Comment: The phenomena of various frequencies travelling at different rates through a medium is known as "group delay". It results in a rounding of the edges type of distortion in the eye-diagram. If the edges get too rounded, loss of signal integrity occurs. As quoted above, this is most notable at the higher frequencies. Consequently, the bandwidth of the data signal becomes limited. The fact that polymers exhibit at least double the group delay of LiNbO3 based modulators is remarkable. I know that many are concerned about losing market share to "thin-film lithium niobate" (TFLN) modulators. The contrast of the performance of polymer vs TFLN should help ease your concern in this regard, at least to a certain degree.
The article is full of other interesting observations, but are a bit more technical. The above paragraphs/comments highlight the compelling benefits of LWLG Perkinamine polymers over Si-based ones.
PG
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