7078 – Multimode Fiber to Chip Signal Processing

This technology presents a mode-coupling method from a multimode fiber to the modes of an integrated waveguide. In a way that each fiber mode corresponds to a defined waveguide mode, allows for selective handling of the spatial modes of the fiber.
  • This technology presents a mode-coupling method from a multimode fiber to the modes of an integrated waveguide. In a way that each fiber mode corresponds to a defined waveguide mode, allows for selective handling of the spatial modes of the fiber.

Abstract

The large mode-mismatch between multimode fiber and on-chip waveguides leading topoor coupling efficiency and loss of much of the information and power held in the fiber'smodes have been a challenge. This invention uses an adiabatic coupler to convert the modes of a multimode fiber to the modes of a waveguide on an integrated photonic chip, proposing lossless one-to-one mode coupling between the two systems. The fiber-to-chip mode coupler consists of a tapered multimode fiber and a tapered on-chip waveguide that are evanescently coupled vertically as shown in Figure (a) below. For on-chip multimode processing, the multimode waveguide is demultiplexed to single mode waveguides as shown in Figure (b), which can be used for signal processing including filtering and modulation. Finally, a mode multiplexer and the fiber-to-chip multimode coupler couple back the signal, which also functions for this reverse process.

Simulations have shown that at least 50% of the power in a 6-mode fiber can be coupled to a multimode waveguide. This technology can be used to efficiently collect power from all the modes of a fiber, which is useful for collecting the entire signal from a multimode fiber for use on-chip. Also, if the identity of the modes is captured by the correspondence of fiber modes with waveguide modes, it can aid on-chip signal processing. Moreover, this could be used to increase data transmission rates in optical communication by increasing the number of spatial mode channels of fiber.

Website

https://cornell.flintbox.com/technologies/3CC14C1A6BDA49E4B0408C91CA3B35D0

Advantages

  • High efficiency with reduced optical loss
  • High data rate transmission

Potential Applications

  • Optical coupling applications in photonic chips
  • Telecommunications and signal processing

Contact Information

Name: Ryan Luebke

Email: rtl77@cornell.edu

Phone: 607-254-4483