標題: The role of optoelectronic feedback on Franz-Keldysh voltage modulation of transistor lasers
作者: Chang, Chi-Hsiang
Chang, Shu-Wei
Wu, Chao-Hsin
光電工程學系
Department of Photonics
關鍵字: Transistor laser;modulator;light-emitting transistor;Franz-Keldysh effect
公開日期: 1-Jan-2016
摘要: Possessing both the high-speed characteristics of heterojunction bipolar transistors (HBTs) and enhanced radiative recombination of quantum wells (QWs), the light-emitting transistor (LET) which operates in the regime of spontaneous emissions has achieved up to 4.3 GHz modulation bandwidth. A 40 Gbit/s transmission rate can be even achieved using transistor laser (TL). The transistor laser provides not only the current modulation but also direct voltage-controlled modulation scheme of optical signals via Franz-Keldysh (FK) photon-assisted tunneling effect. In this work, the effect of FK absorption on the voltage modulation of TLs is investigated. In order to analyze the dynamics and optical responses of voltage modulation in TLs, the conventional rate equations relevant to diode lasers (DLs) are first modified to include the FK effect intuitively. The theoretical results of direct-current (DC) and small-signal alternating-current (AC) characteristics of optical responses are both investigated. While the DC characteristics look physical, the intrinsic optical response of TLs under the FK voltage modulation shows an AC enhancement with a 20 dB peak, which however is not observed in experiment. A complete model composed of the intrinsic optical transfer function and an electrical transfer function fed back by optical responses is proposed to explain the behaviors of voltage modulation in TLs. The abnormal AC peak disappears through this optoelectronic feedback. With the electrical response along with FK-included photoncarrier rate equations taken into account, the complete voltage-controlled optical modulation response of TLs is demonstrated.
URI: http://dx.doi.org/10.1117/12.2212530
http://hdl.handle.net/11536/135905
ISBN: 978-1-62841-977-1
ISSN: 0277-786X
DOI: 10.1117/12.2212530
期刊: PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XXIV
Volume: 9742
起始頁: 0
結束頁: 0
Appears in Collections:Conferences Paper


Files in This Item:

  1. d8faf2559253e0e64f8a5a2a62a001e0.pdf

If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.