TAILIEUCHUNG - Optoelectronics Devices and Applications Part 8

Tham khảo tài liệu 'optoelectronics devices and applications part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Effects of Quantum-Well Base Geometry on Optoelectronic Characteristics of Transistor Laser 269 QuantumWell Position Ả TB spon ps n undamed natural ferquency GHz damping ratio Simulated -3dB Bandwidth GHz 150 190 290 390 74 490 64 590 57 690 Table 1. Simulated device parameters for different Weqw No resonance peak due to QW movement when . 521---------------1--------------r 38k------------ ------------- ---------------k-------------k------------rk------------ Too 200 300 400 500 600 700 QW position A Fig. 11. QW location effect on optical bandwidth an HBTL with well near its collector has larger optical bandwidth while electrical bandwidth is the same. Current gain We predicted previously that optical bandwidth increment would be at cost of sacrificing the current gain p . Further investigation of QW effect on TL optoelectronic characteristics this time electrical leads in an interesting result that matures the previous founding. Collector current gain for an HBTL was calculated in subsection in equations 24 and 25 . As a result of QW movement towards collector simulation at constant bias currents shows that Ttl and consequently p declines. Fig. 13 shows this change in optical bandwidth and current gain versus displacement of QW while bias voltage . vbe forces base current 270 Optoelectronics - Devices and Applications to be constant at lB 33mA for Weqw 590 Ả. This bias enforcement does not disturb generality of the simulation results. The opposite dependence of BW and p to WEqW is a trade-off between TL optoelectronic characteristics. Other experimental and theoretical works proved the described trade-off between p andfsdb as well Then et al. 2009 faraji et al. 2009 . They also predict analytically the above mentioned direct dependence of f-3db on TBspOn. In Then et al. 2008 the authors utilized an auxiliary .

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