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 Title: |
US5572014:
Highly efficient, ultrafast optical-to-electrical converter and method of operating the same
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Wu, Ming-Chiang; Los Angeles, CA
Itoh, Tatsuo; Los Angeles, CA
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| Assignee: |
The Regents of the University of California, Oakland, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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| Published / Filed: |
1996-11-05
/ 1994-07-14
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| Application Number: |
US1994000274919
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| IPC Code: |
Advanced:
G02B 6/30;
G02B 6/42;
H01L 27/144;
Core:
more...
IPC-7:
H01J 40/14;
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| ECLA Code: |
G02B6/30; G02B6/42; H01L27/144R;
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| U.S. Class: |
Current:
250/208.2;
250/227.11;
257/E27.129;
Original:
250/208.2;
250/227.11;
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| Field of Search: |
250/208.1,208.2,208.3,214.1,227.14,227.11,551
359/189,193,195
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| Priority Number: |
| 1994-07-14 |
US1994000274919 |
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| Abstract: |
The periodic array of photodiodes are disposed in a passive optical waveguide electrically coupled in series with each other by microwave transmission line. The collective array of photodiodes coupled to the optical waveguide and microwave transmission line results in an increased bandwidth-efficiency product for the photodetector array as compared to any single photodetector within the array. High optical-to-electrical conversion efficiencies near unity are achieved at frequencies as high as several hundred GHz. High efficiencies are achieved by matching the group velocity of the optical waves within the optical waveguide with the group velocity of electrical signals being transmitted in the microwave transmission line by appropriate selection of the capacitance of each of the photodiodes. Power saturation is improved by decreasing the optical density within the active layer of the photodiodes. Optical coupling efficiencies from optical fibers into and from the optical waveguide are further improved by enlarging the optical mode size in the optical waveguide.
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| Attorney, Agent or Firm: |
Dawes, Daniel L. ;
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| Primary / Asst. Examiners: |
Allen, Stephone;
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 20 claims |
We claim:
1. A circuit for providing transformation between optical and microwave signals comprising:
- a passive optical waveguide;
- a microwave transmission line characterized by a group velocity for microwaves traveling in said microwave transmission line matching a group velocity of optical waves traveling in said optical waveguide; and
- a plurality of photodiodes periodically optically coupled in series to said passive optical waveguide, said photodiodes being periodically and electrically coupled in series to said microwave transmission line so that output of said photodiodes is generated in phase on said microwave transmission line with an optical wave traveling on said optical waveguide serially coupled to said photodiodes,
- whereby said circuit is characterized by high speed, high bandwidth and high efficiency.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 12 U.S. patent(s) that reference this one
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