Abstract
Researchers at the University of Central Florida have designed
a single device that integrates mode demultiplexing, local oscillator power
splitting, and optical 90-degree phase deconstruction using a multi-plane light
converter (MPLC). As a result, the invention enables more reliable and robust
coherent optical signals for communications systems.
Today's current optical front ends use hybrids that require
a large footprint and complicated receiver structures. In contrast, the UCF Mode-Demultiplexing
Hybrid (MDH) can reduce the number of devices needed in a space-division
multiplexing (SDM) coherent receiver while reducing power consumption. Besides simplifying
current coherent optical front ends for mode-division multiplexing (MDM)
receivers, the MDH can also improve multicore fiber systems, where the mode
demultiplexer is replaced by a fan-out device.
Technical Details
The UCF invention comprises an MDH apparatus and methods for
designing the MDH. In one example, the apparatus can consist of an entrance
plane adapted to receive inputs, including a signal with a specified phase/amplitude
profile and a reference. The signal and reference inputs are spatially
separated, occupy non-overlapped areas, and can coherently interfere. The MDH contains
a reflective cavity MPLC with input optically coupled to the signal and
reference inputs. Lastly, an exit plane is optically coupled to an output of
the MPLC, which has spatially overlapping signal and reference spots. Each spot
has a different respective phase shift imposed by the MPLC so that all the
output spots are mutually orthogonal. Thus, a single MDH enables mode
demultiplexing and optical 90-degree mixing of the inputs. In numerical
simulations, the research team demonstrated the use of a three-mode MDH using four
phase plates—one more than required by an MPLC mode demultiplexer. The
performance is comparable to that of commercial single-mode 90-degree hybrids.
Partnering Opportunity
The research team is looking for partners to develop the
technology further for commercialization.
Benefit
Simplifies the structure of the coherent optical front endImproves system performance and reduces costsOperates across multiple wavelength-MDM channelsEliminates the need for phase stabilization, resulting in power savingsMarket Application
Optical communication systemsMode-division multiplexed optical transmission
Brochure