研究目的
To develop 850 nm and 910 nm single mode industrial technology VCSELs capable for error free NRZ data transmission at 60 Gb/s over 800 m and 400 m of OM5 multimode fiber (MMF), respectively, and suitable for PAM4 transmission up to 60 Gbaud.
研究成果
The study demonstrated a new generation of single mode 850 nm and 910 nm industrial VCSELs which enable error free 60 Gb/s long distance transmission over multimode fiber without sacrificing high yield of the 4'' VCSEL technology. The emergence of industrial ~30 GHz -3 dB bandwidth single mode VCSELs will allow further improvement of the signal integrity and, in combination with advanced electronics, will cover both ultra-short and long (100 – 500 m) distances applying NRZ and PAM4 modulation formats at 56 Gbaud or higher.
研究不足
The study is limited to the development and testing of 850 nm and 910 nm single mode VCSELs for specific data transmission rates and distances over multimode fiber. The potential for further optimization and application in different scenarios is not explored.
1：Experimental Design and Method Selection:
The study involved the development and testing of 850 nm and 910 nm single mode VCSELs using industrial multi-wafer metal-organic chemical vapor deposition technique and a foundry-based multi-4'' VCSEL wafer processing technology. The anti-guiding VCSEL concept was applied.
2：Sample Selection and Data Sources:
Devices were grown on 4'' GaAs substrates. The uniformity of the parameters across the wafer was ~ 3% – 7% through a 4'' VCSEL wafer accepting a 3 mm exclusion area at the border.
3：List of Experimental Equipment and Materials:
High speed electrical NRZ-PRBS7 signal was generated through a Bit Pattern Generator (BPG). DC current and RF signal were combined through a Bias-T and supplied to the bare VCSELs using a high-frequency probe. Light was coupled into a lensed coupling unit and then transmitted through different lengths of Prysmian WideCapOM5 MMF. A variable optical attenuator (VOA) was used to adjust the optical received power.
4：Experimental Procedures and Operational Workflow:
Data transmission up to 50 – 60 Gb/s over multimode fiber was studied. The receiver side consisted of a 30 GHz built-in optical receiver of the digital sampling oscilloscope (DSO) used for the acquisition of the optical eye diagrams, while for Bit-Error-Rate (BER) measurements a 22 GHz bandwidth GaAs photoreceiver (PR) and an Error Analyzer (EA) were employed.
5：Data Analysis Methods:
To realize error free transmission 5-tap equalization at the receiver side was applied.
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