Silicon photonics: On-chip OPOs

Optical parametric oscillators (OPOs) have now been realized in a CMOS-style process by exploiting nonlinear four-wave mixing. Such multiwavelength sources bring the prospect of ultrafast chip-to-chip optical data communications a step closer.
J. Witzens, T. Baehr-Jones, M. Hochberg, On-chip Optical Parametric Oscillators (News and Views), Nature Photonics 4, 10-12 (2010).