Keio University's "Mosquito method" draws light paths into polymer with a single needle, using a graded-index core to avoid interface scattering for near-material-limit loss — and uses fluid dynamics to beat the needle-size limit for 20 µm pitch. What is the open question for the polymer waveguide route?

CPO volume production is held back by micro-lens pick-and-place and active alignment. AIST turns the lens-mirror into an opto-chiplet embedded during molding, routes light with an Optical RDL, and widens alignment tolerance to ±12 µm.

AIST × KYOCERA have lit up the long-shelved AOP concept for the first time: an embedded SiPh chip, polymer ORDL and 3D micro-mirrors deliver 112 Gbps PAM4 with 3.35 dB TDECQ, passing IEEE specs. How far has the polymer optical-redistribution route come?