Modulation Performance Enhancement of Directly Modulated Injection-Locked Semiconductor Lasers Using an Equivalent Electrical Circuit
| Autor: | Ho-Jun Bae, Hyuk-Kee Sung, Jun-Hyung Cho |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
TK7800-8360 Computer Networks and Communications Physics::Optics optically injection-locked laser Integrated circuit Signal Semiconductor laser theory law.invention law Electrical and Electronic Engineering semiconductor laser SPICE business.industry Emphasis (telecommunications) equivalent circuit direct modulation Laser Hardware and Architecture Control and Systems Engineering Modulation Electrical network Signal Processing frequency response Optoelectronics Equivalent circuit Electronics business |
| Zdroj: | Electronics Volume 10 Issue 19 Electronics, Vol 10, Iss 2409, p 2409 (2021) |
| ISSN: | 2079-9292 |
| DOI: | 10.3390/electronics10192409 |
| Popis: | We propose an equivalent electrical circuit model to evaluate the direct modulation performance of optically injection-locked (OIL) semiconductor lasers. We modeled the equivalent circuit of the OIL laser based on alternating complex envelope representations, simulated it using the Simulation Program with Integrated Circuit Emphasis (SPICE), and analyzed the frequency response of the OIL laser. Although the frequency response of the OIL laser is better than that of a free-running laser, its 3-dB modulation performance is degraded by the relaxation oscillation that occurs during direct modulation of the semiconductor laser. To overcome this limitation and maintain the maximum modulation performance within the entire locking range, we also designed an electrical filter to preprocess the electrical modulation signal and compensate for the non-flat modulation output of the OIL laser. The damping ratio of the directly modulated OIL laser increased by 0.101 (280%) and its settling time decreased by > 0.037 (44%) when the electrical compensation circuit was added, exhibiting a flat 3-dB modulation bandwidth of 28.79 GHz. |
| Databáze: | OpenAIRE |
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