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:
Oct. 11, 1994
Filed:
Mar. 17, 1993
Applicant:
Inventor:
Hisao Nakajima, Bagneux, FR;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ;
U.S. Cl.
CPC ...
359152 ; 359113 ; 359130 ; 372 96 ;
Abstract
A coherent detection transceiver comprises a stack of semiconductor layers with an active layer (12) and a grating (16) having a phase shifter (18). An electrode (30) is placed above the phase shifter in order to tap a voltage. This voltage is processed in a heterodyne circuit (36) in order to restore the modulation of the light beam introduced into the active layer.