研究目的
Investigating the use of O-band, short-cavity long-wavelength single-mode VCSELs for high-speed NRZ transmission in intra and inter data center networks.
研究成果
The study successfully demonstrates high-speed NRZ transmission using an O-band VCSEL, achieving error-free performance over significant distances without DSP. The results highlight the potential of VCSEL-based links for data center networks, though further optimization is needed for longer reaches and higher data rates.
研究不足
The study is limited by the bandwidth and output power of the VCSEL, as well as the residual chromatic dispersion at the operating wavelength. The experiments do not explore transmission over distances beyond 15 km or the use of more complex dispersion compensating schemes.
1：Experimental Design and Method Selection:
The study employs a directly modulated short-cavity long-wavelength single-mode VCSEL emitting at 1326 nm, combined with an analog 6-tap transmit feedforward equalizer for pre-equalization without relying on digital signal processing.
2：Sample Selection and Data Sources:
The experiments use standard single-mode fiber (SSMF) for transmission distances up to 15 km and back-to-back configurations. A pseudo-random bit sequence (PRBS) with a period of 27-1 bits is transmitted for real-time bit error ratio measurements.
3：List of Experimental Equipment and Materials:
Key equipment includes a VCSEL emitting at 1326 nm, SSMF, an analog 6-tap FFE, and a photoreceiver for signal detection.
4：Experimental Procedures and Operational Workflow:
The setup involves modulating the VCSEL with NRZ signals, transmitting over SSMF, and detecting the signal at the receiver end. The FFE is optimized for each transmission rate and distance.
5：Data Analysis Methods:
Real-time bit error ratio measurements are performed to evaluate link performance, with results compared against FEC thresholds.
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