研究目的
Investigating the realization of an electronically tunable distributed feedback (DFB) laser heterogeneously integrated on a silicon photonics platform for future data center networks.
研究成果
The demonstrated CMOS-compatible laser can be an attractive candidate as a transmitter to enable the realization of optical packet or burst switching systems for use in data center networks, with a 2 nm continuous wavelength tuning range and wavelength switching times on the order of 3 ns.
研究不足
The presence of the buried oxide (BOX) layer and the DVS-BCB overcladding limit the heat sinking properties of the laser device. The asymmetric geometry of the TTG-based laser structure can lead to a misalignment of the carrier density profile and the optical mode, setting the ultimate limit to the tuning efficiency and wavelength tuning range.
1：Experimental Design and Method Selection:
The laser structure is designed with a tunable twin-guide (TTG) InP/InGaAsP membrane integrated on a silicon-on-insulator (SOI) waveguide circuit. Tuning is achieved through carrier injection into the tuning layer.
2：Sample Selection and Data Sources:
The SOI circuit contains a first-order λ/4 phase-shifted Bragg grating. The TTG membrane comprises various layers including a multiple quantum well (MQW) active layer and an InGaAsP tuning layer.
3：List of Experimental Equipment and Materials:
Equipment includes an HP 8153A power meter, HP optical spectrum analyzer (OSA), Keysight PNA-X N5247A Vector Network Analyzer (VNA), Anritsu MP2100A pulse-pattern generator (PPG), and Tektronix DSA 8300 sampling oscilloscope. Materials include the TTG epitaxial layer stack and SOI waveguide structures.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves electron-beam lithography (EBL), reactive-ion etching (RIE), and adhesive DVS-BCB bonding. Characterization includes static and dynamic measurements of the laser device.
5：Data Analysis Methods:
The small-signal modulation response and large-signal modulation characteristics are analyzed to determine the laser's performance.
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