We propose and demonstrate a reconfigurable data exchange device for wavelength-division multiplexing (WDM) and mode-division multiplexing (MDM) compatible optical networks, which is capable of exchanging data information between a fundamental mode (TE0) signal and an arbitrary high-order mode (TEx) signal with the same wavelength. We experimentally demonstrate exchange for a TE0 mode signal and a TE1 mode signal. The insertion loss is about 7.5 dB including terminal coupling loss, the extinction ratio is more than 20 dB within the C band. The crosstalk for the TE1-to- TE0 and TE0-to-TE1 mode conversions is measured to be less than -22 dB and -16 dB, respectively. Clear and open eye diagrams of two different wavelength signals at 10 Gb/s are obtained. The proposed scheme is expected to be used for on-chip WDM-MDM compatible networks in future due to its scalability, compact size and reconfigurable functionality.
Owing to the promising application prospect of mode division multiplexing technology, reconfigurable optical mode multiplexers/demultiplexers, which enable convenient construction of flexible and complex on-chip optical networks, have attracted increasing attention in the academic community. Here, we propose and experimentally demonstrate a reconfigurable two-mode multiplexer/demultiplexer based on novel three-waveguide-coupling structures. The fabricated device can multiplex two input signals to fundamental and first-order quasi-transverse electric modes with large operation bandwidth. Static response spectra show that the optical crosstalk at the output ports of the device are less than -14.3 dB and -13.7 dB over the entire C band (> 40 nm), respectively. The highspeed data transmission ability of 40 Gbps for each multiplexing channel are also demonstrated successfully. The presented device is believed to be a potential candidate for future on-chip optical network with large-scale integration, flexible functionality, and low cost.
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