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MEMS Optical Switches

MEMS Optical Switches. Xiaobo Hou ECEE 641 March. 13, 2003. Introduction. Why optical switches Explosive network traffic Rapidly growing data rate and port count Bottleneck due to conventional OEO switches (bandwidth, bit error rate and capacity mismatch) Cost effective

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MEMS Optical Switches

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  1. MEMS Optical Switches Xiaobo Hou ECEE 641 March. 13, 2003

  2. Introduction • Why optical switches • Explosive network traffic • Rapidly growing data rate and port count • Bottleneck due to conventional OEO switches(bandwidth, bit error rate and capacity mismatch) • Cost effective • Competition is in the high date rate range

  3. Optical switches • What are the options (From Tellium Inc)

  4. MEMS Optical Switches • What is MEMS • Micro-Electro-Mechanical System • What is MEMS optical switches • Steerable micromirror array to direct optical light from input port to its destination port. • System-in-a-chip

  5. 2D MEMS Switches • Mirrors have only 2 positions (cross or bar) • Crossbar configuration • N2 mirrors

  6. 3D MEMS Switches • Mirrors can be tilted to any angles • N or 2N mirrors accomplishing non-block switching • Good scalability

  7. Lucent WaveStar LambdaRouter, 1999 Nortel X-10002000 3D switch examples

  8. How to fabricate • MEMS process

  9. How to design • Paraxial Gaussian beam model • Optimize beam size W0, Given separation between mirror arrays

  10. Actuating Mechanism (I) • Electrostatic • mirrors are tilted by electrostatic force between opposite charged plates

  11. Actuating Mechanism (II) • Electromagneticattraction between electromagnets with different polarity

  12. Actuating Mechanism (II) • Scratch Drive Actuators (SDAs)mecromachining scheme

  13. Actuating Mechanism Comparison

  14. Switching speedsubmicrosecond Scalability512  512 Insertion Loss3-7 dB Power dissipationless than electrical switch core Controllability Reliability Manufactuability Serviceability standardization Performance and Challenges

  15. Conclusion • MEMS optical switches are currently dominant and promising in the future • Open question to switch speed:what is the ultimate requirement? • ALL-optical? Not yet.

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