Half duplex transmission with asymmetric surface normal electro absorption modulator-based optical transceiver for...

Area of Science:

• Biomedical Engineering
• Optical Communications
• Materials Science

Background:

• Advanced surgical endoscopes require high-speed data transmission for hyperspectral imaging.
• Conventional electrical wiring presents limitations for miniaturization and power consumption at the distal tip.
• Need for alternative communication methods to support emerging endoscopic technologies.

Purpose of the Study:

• To propose and demonstrate an optical communication link for surgical endoscopes.
• To utilize a surface-normal electro-absorption modulator (SNEAM) as a dual modulator/detector.
• To achieve high-speed, low-power bidirectional data transmission at the endoscope's distal tip.

Main Methods:

• Designed and fabricated a transfer-printed asymmetric reflective SNEAM.
• Implemented a half-duplexing protocol for bidirectional communication.
• Utilized a proximal light source and single-mode fiber for data transmission.

Main Results:

• Demonstrated bidirectional transmission at 320 Mb/s with 0.5 mW power consumption.
• Achieved ~6 dB extinction ratio and ~8 GHz bandwidth for the SNEAM.
• Enabled error-free operation (BER < 10^-9) without TIA or FEC due to cavity resonance enhancement and low fiber loss.

Conclusions:

• The SNEAM-based optical link offers a viable, low-power alternative to electrical wiring for surgical endoscopes.
• This technology supports high-speed data rates essential for advanced endoscopic imaging.
• Minimized footprint and power consumption at the distal tip are key advantages for future endoscopic devices.