AI Article Synopsis
- A Mach-Zehnder interferometer (MZI) can efficiently (de)multiplex various modes in few mode fiber using either a reflective image inverter or a Gouy phase shifter (RGPS), without fundamental loss.
- The study introduces the use of RGPS with binary phase plates for multiplexing, although only low order modes are multiplexed accurately with the RGPS that shifts π for odd modes.
- A new, more compact refractive image inverter is proposed to enhance performance and minimize crosstalk between modes, and experimental results demonstrate successful bimodal multiplexing using both the approximated and exact versions of the inverter, with the RGPS proving effective at demultiplexing odd modes in a unique manner.
Article Abstract
A Mach-Zehnder interferometer (MZI) that includes in an arm either a reflective image inverter or a Gouy phase shifter (RGPS) can (de)multiplex many types of modes of a few mode fiber without fundamental loss. The use of RGPSs in combination with binary phase plates for multiplexing purposes is studied for the first time, showing that the particular RGPS that shifts π the odd modes only multiplexes accurately low order modes. To overcome such a restriction, we present a new exact refractive image inverter, more compact and flexible than its reflective counterpart. Moreover, we show that these interferometers remove or reduce the crosstalk that the binary phase plates could introduce between the multiplexed modes. Finally, an experimental analysis of a MZI with both an approximated and an exact refractive image inverter is presented for the case of a bimodal multiplexing. Likewise, it is proven experimentally that a RGPS that shifts π/2 demultiplexes two odd modes which can not be achieved by any image inverter.
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| http://dx.doi.org/10.1364/OE.25.010925 | DOI Listing |
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