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Radio-Frequency Characteristics of Ultraviolet Optical Links

Radio-Frequency Characteristics of Ultraviolet Optical Links. J. Deng , S. Halder, and J. C. M. Hwang, L ehigh University A. Osinsky, SVT Associates H. Seigneur, W. V. Schoenfeld, and L. Chernyak, University of Central Florida. Outline. Introduction

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Radio-Frequency Characteristics of Ultraviolet Optical Links

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  1. Radio-Frequency Characteristics of Ultraviolet Optical Links J. Deng, S. Halder, and J. C. M. Hwang, Lehigh University A. Osinsky, SVT Associates H. Seigneur, W. V. Schoenfeld,and L. Chernyak, University of Central Florida

  2. Outline • Introduction • Light-emitter diode (LED) characteristics • Photo-detector (PD) characteristics • LED-PD link DC characteristics • LED-PD link RF characteristics • Conclusion

  3. Non-Line-of-Sight Covert Links

  4. Current UV Links Mercury lamp + photo-multiplier tube = bulky, inefficient and expensive

  5. Proposed UV Links 300µm 100µm LED PD1 GaN light-emitting diode + photo-detector diode = compact, efficient, low cost 5µm PD2

  6. LED Emission Spectra I (mA) 100 80 60 40 20

  7. PD DC Characteristics Dark Current Photo Response Comparable between (■) PD1 & (▲) PD2

  8. Distributive R-C Effect (▲) PD2 (■) PD1 Both (symbol) measurement and (curve) simulation show larger dispersion in PD1

  9. DC LED-PD Link Comparable between (■) LED-PD1 & (▲) LED-PD2

  10. Small-Signal LED-PD Link (▲) LED-PD2 more wide- band than (■) LED-PD1

  11. Bias Dependence of LED-PD1 Link Bandwidth and gain of LED-PD1 link increase with reverse bias of PD1 LED-PD2 link bandwidth independent of PD2 bias

  12. Bias Dependence of LED-PD2 Link • Bandwidth of LED-PD2 link increases with LED current • Bandwidth of LED-PD1 link independent of LED current

  13. Conclusion • 370-nm link demonstrated at 60 MHz by using GaN LED and photo-detector • Link bandwidth is orders-of-magnitude higher than that achieved by using lamp and tube • Link bandwidth limited by LED instead of photo-detector • Bandwidth improvement of solar-blind (<280nm) LED in progress

  14. Acknowledgment • LED supplied by Tekcore Co., Taiwan • Research sponsored in part by the U.S. Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-06-2-0020. The views and conclusions contained in this presentation are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government.

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