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:
Jul. 27, 2004
Filed:
Aug. 16, 2002
Erkin Sidick, San Ramon, CA (US);
Wavesplitter Technologies, Inc., Fremont, CA (US);
Abstract
A cascaded interleaver includes at least three two-stage Fourier filters. A first of the Fourier filters includes first and second waveguides such that the first waveguide has a longer optical path length than the second waveguide. A second of the Fourier filters includes third and fourth waveguides such that the third waveguide has a longer optical path length than the fourth waveguide. A third of the Fourier filters has fifth and sixth waveguides such that the fifth waveguide has a longer optical path length than the sixth waveguide. The third waveguide has an input coupled to an output of the first waveguide and the fifth waveguide has an input coupled to an output of the second waveguide. At least one of the Fourier filters include at least three couplers alternating with a delay path between adjacent ones of the couplers. A second of the couplers is of an order different from a first and third of the couplers. A 0 -order coupler has parallel waveguides with the shortest possible length for a given bar coupling ratio and a given signal wavelength. Likewise, a 1 -order coupler has parallel waveguides with the second shortest possible length for the same bar coupling ratio and signal wavelength.