We investigated the temperature characteristics of a modularized semiconductor optical amplifier (SOA) utilizing InAs/AlGaAs quantum dot (QD) in the active layer operating at C-band (1.53μm–1.56μm). It has been reported by many literatures on physics that QDs are superior at energy efficiency and leads to less thermal energy generation. By changing the temperature of the Peltier element inside the module from 20℃ to 80℃, we measured the difference in the gain at each input power and injection current. The QD-SOA we measured was utilizing InAs QD in active layer and the laminated structure had 20 layers having 20nm of intermediate layers which refers to the width between QDs. When the input power was -50 dBm, we successfully confirmed more than 10 dB at the Peltier element temperature of 70℃ by injecting a current larger than 400 mA. In addition, we obtained a maximum gain of 20.68 dB at the center wavelength and a constant gain of approximately 15 dB at other Peltier element temperatures. It can be concluded from the output of the experiment that this QD-SOA can be put to use in optical communication in several situations where the temperature ranges between 20℃ to 80℃. This involves a new approach towards the application of QD amplifiers in the field of optical fiber communications.
Naoya Yoshida, Yuu Fukae, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Matsumoto, Toshimasa Umezawa, and Hideyuki Sotobayashi, "Temperature dependence of gain in a highly stacked quantum-dot semiconductor optical amplifiier," Proc. SPIE 10100, Optical Components and Materials XIV, 1010017 (Presented at SPIE OPTO: February 01, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2251194.
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