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106.25-Gbps PAM-4 bidirectional optical sub-assembly module with in-line arrangement of optical and electrical
Optics Express
|February 25, 2022
Summary
We developed a 106.25-Gbps PAM-4 bidirectional optical sub-assembly for optical access networks. This design ensures easy assembly and high performance, achieving excellent receiver sensitivity and low power penalty.
Area of Science:
- Optoelectronics
- Optical Communication Systems
- Integrated Photonics
Background:
- Optical access networks require high-speed, cost-effective, and compact optical transceivers.
- Existing solutions face challenges in assembly, alignment tolerance, and electrical crosstalk.
Purpose of the Study:
- To demonstrate a high-speed (106.25-Gbps) PAM-4 bidirectional optical sub-assembly for optical access networks.
- To propose design strategies for improved manufacturability and performance.
Main Methods:
- Integration of a driver amplifier, electro-absorption modulated laser, photodiode, transimpedance amplifier, and optical filter block.
- In-line arrangement of optical and electrical interfaces.
- Design strategies to ensure optical alignment tolerance and reduce electrical crosstalk.
Main Results:
- Successful demonstration of a 106.25-Gbps PAM-4 bidirectional optical sub-assembly.
- Measured receiver sensitivity of <-11.4 dBm at the KP4 forward error correction limit.
- Power penalty of <0.9 dB for 10-km single-mode fiber transmission.
Conclusions:
- The proposed design enables a high-performance, easily assembled optical sub-assembly for optical access networks.
- The design effectively mitigates electrical crosstalk and maintains optical alignment.
- Achieved performance metrics meet the demands for next-generation optical access systems.
