1.9 Tbps receiver optical subassembly based on LAN-WDM hybrid integration.

Area of Science:

• Photonics and Optical Engineering
• Telecommunications Technology
• Integrated Optics

Background:

• Advancements in high-speed data transmission are crucial for local-area networks (LAN-WDM).
• Existing receiver optical subassemblies (ROSAs) face challenges in cost-effectiveness and integration for higher data rates.

Purpose of the Study:

• To develop a low-cost, hybrid-integrated ROSA for high-capacity LAN-WDM systems.
• To achieve an aggregate data rate exceeding 1.6 Tb/s using O-band technology.

Main Methods:

• Utilized an O-band arrayed waveguide grating (AWG) demultiplexer integrated with a photodetector (PD) array.
• Implemented vertical coupling via a 41° polished AWG output facet for efficient light transfer.
• Designed a flexible printed circuit (FPC) board with 16 coplanar waveguides (CPWs) for RF signal and power delivery.

Main Results:

• Achieved a maximum coupling efficiency of 88.4% between the AWG and PD array.
• Demonstrated receiver sensitivities better than -7.3 dBm across all lanes.
• Successfully transmitted a single-channel 60-GBaud four-level pulse-amplitude modulation (PAM-4) signal per lane.

Conclusions:

• The developed hybrid-integrated ROSA enables an aggregate data rate of 1.9 Tb/s, surpassing the 1.6-TbE target.
• This technology offers a cost-effective solution for next-generation high-speed local-area networks.
• The vertical coupling and FPC integration demonstrate efficient design for high-frequency signal handling.