研究目的
To enhance the transmission capacity in a photonic integrated circuit by employing mode-division multiplexing (MDM) with PAM-4 on a silicon platform.
研究成果
An integrated four-channel MDM chip implemented on a silicon platform was designed, fabricated, and evaluated, demonstrating a 80 Gbit/s MDM PAM-4 signal transmission system. The approach significantly increases the data capacity of silicon-based on-chip communications, with potential applications in radio over fiber (RoF) systems.
研究不足
The main problem with the on-chip mode multiplexer is the large footprint due to the use of wire waveguides. The channel crosstalk, although low, could be further optimized by improving the design of the cascaded directional couplers.
1：Experimental Design and Method Selection:
The study involves designing and fabricating a photonic integrated four-channel MDM circuit on a silicon platform using cascaded asymmetrical directional couplers on rib waveguides.
2：Sample Selection and Data Sources:
The fabricated MDM circuit is used to demonstrate a 80 Gbit/s mode-division multiplexed PAM-4 signal transmission system.
3：List of Experimental Equipment and Materials:
Includes a tunable laser source, intensity modulator, arbitrary waveform generator, erbium-doped fibre amplifier, single-mode fibre, tunable optical filter, photodiode, and sampling oscilloscope.
4：Experimental Procedures and Operational Workflow:
Optical signals are modulated with PAM-4, amplified, split into four channels, transmitted through the MDM circuit, and then demultiplexed and monitored.
5：Data Analysis Methods:
The performance is evaluated by measuring the bit error rate (BER) and observing eye-diagrams of the transmitted signals.
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