The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 1981
Filed:
Aug. 06, 1979
John M Worlock, Fair Haven, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A low noise multistage photodetector device is formed from a sequence of pairs of layers of opposite conductivity type having heterojunctions between each pair. The second layer of each pair has a bandgap which is larger than the bandgap of the first layer of the pair adjacent to the second layer. Electrodes are formed on the device so that voltages may be applied to reverse bias the heterojunctions formed between each pair in the sequence and to forward bias the heterojunctions formed between the second layer of one pair and the first layer of another pair. The device provides traps for one sign of carrier, which traps prevent the trapped carrier from avalanching through amplification regions of the device.