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:
Mar. 25, 2008
Filed:
Nov. 06, 2002
Torsten Augustsson, Upplands Väsby, SE;
Torsten Augustsson, Upplands Väsby, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A device and method for multiplexing or demultiplexing M optical signals, each having a different wavelength λ. An MMI waveguide has a length such that each optical signal that propagates into the MMI waveguide at an i:th access waveguide, where i≦N, and N is greater than or equal to 2, produces N self-images inside the MMI waveguide at a respective distance Ifrom the access waveguides. Each of M wavelength selective reflectors is arranged near a respective distance I, wherein the m:th reflector reflects the optical signal carried by the m:th wavelength, where 2≦m≦M, while being substantially transparent to all other wavelengths. Each of M phase adjustors is arranged relative to a corresponding reflector, wherein the m:th phase adjustor adjusts the phase of the self-images of the optical signal carried by the m:th wavelength to create a single self-image at a selected output access waveguide when reflected by the m:th reflector.