The best way to  think  about what it  is  that POET is doing is  to  first ask  the question what is the lowest cost solution to transfer data using  an optical  network. And the next question is what the reach requirements are. POET has developed a very low cost waveguide array that supports CWDM. So currently with CWDM they use duplex fiber. Which means one fiber for transmitting and one fiber for receiving? Now with CWDM they can typically fit 8 lanes or channels on each fiber. So up to eight times the information on each fiber. Now this is using the simplest of modulation schemes where the light is ether identified as on or off representing a 1 or a zero. Coherent optical systems require a large increase in complexity to measure phase angle or the amplitude of light across multiple points in time of each quadrant of light. It requires error correction and complicated digital signal processors.

So the point POET is making is that because CWDM is a low cost application (for POETs integrated waveguide filtering) and multiplies the amount of information on each fiber there is no current need to expand, complicate and increase the cost to do advance modulation techniques. But just so people are aware what these advance modulations techniques allow is the multiplication of information on each wavelength. So the application of quadratic measurement combined with CWDM creates what is known as super channels. So far super channels are limited to DWDM systems where long distance transmission (fibre costs) can pay for these advance schemes to fit as much data as possible on each fiber. But one would expect that super channels may be employed in POET optical engines some day in the future?

For now POET can keep it simple and really low cost with existing designs but yes further expansion of data per fiber is kind of inevitable in the future where superchannels  may find a home in shorter distances. 

Also a reference from one of the earlier links re the polymer platform you linked:

This chip may feature passive elements such as optical fibers, thin film filters, isolators, rotators, and micro-optics. Photodiodes and laser systems can be added as needed. These components are connected to the waveguides via microfabrication procedures.

The reason you have not seen the link here on this forum is because the language above relates to free space optics …lenses and non CMOS compatible processes. And watching that pick and place tool highlights in the attached video clip perform optical placement and fixing was like watching paint dry.

And by the way we don’t know what POET customers will be asking for in the future. But again POET allows for the efficient connectivity of light and the assembly of electronic and photonic die in whatever configuration is required. They will mix and match to build whatever engine the customer requires.