Patent ID: 11888520
Assignee: RAYTHEON BBN TECHNOLOGIES CORP.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 7:
8. The photonic RF signal correlator of claim 1, wherein the M discrete optical delay lines coupled to the M outputs of the first 1-to-M optical splitter are comprised of a first waveguide section formed of a first single-chemistry material, coupled to a second waveguide section with a transition waveguide region that is increasingly doped with a second single-chemistry material, coupled to a third waveguide section that is formed of the second single-chemistry material, coupled to a fourth waveguide section with a decreasingly doped transition waveguide region of decreasingly doped second single-chemistry material, coupled to a fifth waveguide section that is formed of the first single-chemistry material.