Multifrequency laser with reduced intracavity wave mixing

We demonstrate a ten-channel 100-GHz spacing, waveguide grating router mult ifrequency laser that has significantly reduced intracavity wave mixing. Th e mixing products for the improved design are now too small to cause signif icant laser fluctuations during simultaneous multichannel operation. This w as accomplished by reducing the shared waveguide length to 150 mu m. We pro vide evidence that a significant portion of the remaining wave mixing occur s in the intracavity waveguide grating arms.