A horn ridge waveguide DFB laser with reduced spatial hole burning for high-speed modulation

作者：Ke, Cheng^*; Wang, Chuping; Fu, Junwei; Zhou, Yulan; Li, Chunsheng

来源：Optical Review, 2017, 24(3): 345-350.

DOI：10.1007/s10043-017-0326-y

• Semiconductor lasers
• Distributed feedback lasers
• Direct modulated laser

In this paper, we propose a DFB laser with a horn ridge waveguide (HRW) to suppress the longitudinal spatial hole burning (LSHB) effect in the lasers cavity, thus to reduce the rolloff at low frequency. The simulation result shows that HRW DFB lasers could significantly suppress the LSHB effect and its modulation bandwidth is increased by 14% comparing with the conventional straight ridge waveguide (RW) DFB lasers when the normalized coupling coefficient (kappa L) is 3.0. The calculated eye diagrams of HRW DFB lasers under direct 25 Gbps modulation have clearer opening than that of the conventional RW DFB lasers. These superior properties are due to the suppression of the LSHB effect by the HRW structure.

• 出版日期2017-6
• 单位华中科技大学