A physical micromachining technique is demonstrated in a low-loss flat-fiber substrate to fabricate a multimode interference (MMI) device. The flat-fiber substrate is a low-index-contrast material; however, by making use of two physically micromachined trenches, lateral confinement is achieved providing high index contrast for the MMI region. A 1 x 3 MMI device exhibiting 1.89 dB of excess loss has been demonstrated.
© 2012 IEEE
Sumiaty Ambran, Christopher Holmes, James C. Gates, Andrew S. Webb, Lewis G. Carpenter, Faisal Rafiq Mahamd Adikan, Peter G. R. Smith, and Jayanta K. Sahu, "Fabrication of a Multimode Interference Device in a Low-Loss Flat-Fiber Platform Using Physical Micromachining Technique," J. Lightwave Technol. 30, 2870-2875 (2012)