ada503803(the mobile internet——the next big thing2007)(7)

移动互联网及应用

Big Optical Challenge/Opportunity:Hyperfine Optical FilteringUltra-Low Loss Photonic Waveguides& Resonators Ultra-Low Loss Photonic Waveguides& Resonators Problems: Today’s PIC waveguides have losses closer to Black Paint than to Optical Fibers! Today’s resonator Q’s are well below the predicted limitationsTypical Telecom Fiber Typical High-Index Dielectric and SOI Waveguide Best Ever PLC Waveguide (SiO2-Based) Black Paint Welding Goggles

Projected Limitation of and Achieved Q factor for Crystalline WGM Resonators near 1.5µm 10 10 10 Q factor 10 1014 13 12 11 10 9 8 7

“Best” Fiber

Typical Semiconductor

CaF2 Silica

10-3

10-2

10-1

100

101

102

103

104

105

106

107

108

109

Optical Loss (dB/km) Optical Fiber Planar Waveguides 0.02 dB/µs>200 dB/µs* Table courtesy of Rich Davis, NGST

10 10 10

LiNbO31000

* * **

Al2O3

Ref. L. Maleki, JPL

2000 3000 4000 Wavelength, nm

5000

Opportunity: Opportunity: Orders of magnitude (>102) improvement in optical waveguide& resona

tor loss enables Orders of magnitude (>102) improvement in optical waveguide& resonator loss enables agile RF processing& filtering on a chip (high resolution II/Q optical processors) agile RF processing& filtering on a chip (high resolution/Q optical processors)

“Radical Improvements in Chip-Scale Passive Optical Waveguides& Resonators Are Still To Come” -Steve Pappert, 2007

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