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High-efficiency and stable optical transmitter using VCSEL-direct-bonded connector for optical interconnection
Optics Express
|June 25, 2009
Summary
This study presents a novel optical transmitter module using a bottom-emitting Vertical-Cavity Surface-Emitting Laser (VCSEL) directly bonded to a fiber connector. This direct bonding method significantly enhances optical and electrical efficiencies for printed circuit board interconnections.
Area of Science:
- Optoelectronics
- Materials Science
- Photonics
Background:
- Printed circuit board (PCB) interconnections face challenges in optical signal transmission efficiency.
- Traditional methods often suffer from losses due to Fresnel reflection and beam divergence.
- Improving thermal dissipation is crucial for enhancing the performance of optical components like VCSELs.
Purpose of the Study:
- To develop a high-efficiency optical transmitter module for PCB-based interconnections.
- To investigate the impact of direct bonding a bottom-emitting VCSEL onto a fiber connector.
- To assess the improvements in optical coupling, thermal management, and overall efficiency.
Main Methods:
- Fabrication of an optical transmitter module utilizing a bottom-emitting VCSEL.
- Directly bonding the VCSEL to a 90-degree-bent fiber connector using epoxy.
- Employing ray trace simulations to analyze optical losses.
- Experimental validation of simulation results and performance characterization.
- Testing the module's performance at high data rates.
Main Results:
- Ray trace simulations confirmed that close contact between the VCSEL and connector minimizes Fresnel reflection and beam divergence losses.
- Experimental results validated the simulation findings, demonstrating significant performance improvements.
- Thermal dissipation was enhanced through the epoxy layer and connector, improving VCSEL power characteristics.
- The bonded VCSEL exhibited approximately 40% higher power output compared to the bare VCSEL.
- A successful eye diagram was achieved at 5 Gb/s/channel with an 850 nm wavelength.
Conclusions:
- Direct bonding of VCSELs to fiber connectors significantly improves optical and electrical efficiencies.
- The developed transmitter module offers a robust solution for high-speed PCB optical interconnections.
- This approach enhances thermal management, leading to superior power characteristics and reliable performance.
