Spartex - Here's a response to your question below.
Great post Photonics_Guy, I hope you can answer a question I have on your paragraph below. Is this R33 from the spider charts that Dr. Lebby has been presenting in his video slides? And when you say, "already beating all other materials" is that by his statement of 2-3x higher data transmission speeds (with 1/2 the power) minus need for chip-driver than "all other materials"? Thanks so much for your insights and knowledge!
The chart below from a recent presentation that Michael gave shows the "3dB Bandwidth" of LWLG's polymers compared to competing materials. The key takeaway is that the wider the bandwidth a given material provides, the faster the data rate it supports. LWLG polymers are running circles around the competition. As I said in the earlier post, the r33 parameter is the quantitative measure of how effective the modulator material is in modulating the data onto the optical signal coming from the laser.
R33 addresses the degree of signal loss through the material as well as its modulating capability. As the 3dB bandwidth of the modulator increases, that means the loss of optical power through the device is low enough to support the bandwidth.
A tradeoff exists between the Vpi of the device and the 3dB bandwidth. As Vpi is increased, the bandwidth increases, and - conversely - as the Vpi is lowered, the 3dB bandwidth decreases. However, to directly drive the modulator from CMOS circuits, we need a very low Vpi of 1V or less. Competing design parameters. The reason r33 is so important is that a higher r33 allows the designer to achieve higher bandwidths WHILE also lowering the Vpi of the device so it can be directly driven from CMOS circuits.
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