Typical Silicon Photonics architectures require the waveguides and microrings to remain at a fixed temperature to avoid wavelength drifting. The optical interposer waveguides do not require this same level of thermal control. From the AGM transcript:

Taking the next step with highly differentiated remote light sources

Likewise, we’re transcending our remote light sources to one that provides immense technical superiority. Stickiness in the market and with customers doesn’t only come with cost; there needs to be a plus-one feature that results in stickiness, and that is what we’re striving to do to capture a disproportionate share of the remote light source market as that market develops and matures.

We’re developing brand-new architectures and concepts around the interposer that can build multiple lanes of lasers on the interposer with frequency spacings down to 50 gigahertz in an uncooled application, which is unheard of. So these are things that we’re working on now, and more to follow.