研究目的
To improve the transmission feature in point-to-point solutions by improving the characteristics of the directly modulated FP laser, which will minimize the need to have dispersion-compensating elements and external modulations, adding value to the availability for the low-cost solution of a FP laser.
研究成果
Injection locking enhances most of FP laser’s characteristics simultaneously, making the directly modulated IL FP laser a promising candidate for optical communications. The study demonstrated significant improvements in the frequency response of the FP laser in injection-locked mode over free-running mode, especially in regions with high power losses due to destructive interference of the sidebands. This improvement is expected to extend the length of already-built, fiber-to-the-home, point-to-point networks with a simple upgrade in the central office.
研究不足
The study focused on point-to-point optical access networks with specific fiber lengths and a 1550-nm wavelength. The applicability to other network topologies or wavelengths was not explored. Additionally, the long-term stability of the injection-locked FP laser was noted to be several hours, suggesting potential limitations in continuous operation without adjustments.
1：Experimental Design and Method Selection:
The experiment involved measuring the frequency response of a directly modulated Fabry–Pérot (FP) laser diode in both free-running and injection-locked states for distances up to 35 km. The methodology included adjusting the optical power and frequency detuning of the master laser to achieve injection locking.
2：Sample Selection and Data Sources:
A 240-mm-long InGaAsP semiconductor FP laser was used, with measurements conducted in the 20-GHz frequency range.
3：List of Experimental Equipment and Materials:
Equipment included a tunable laser source (TLS) model HP 8153A, optical circulator, polarization controller, temperature controller, asymmetric 20/80 optical divider, optical spectrum analyzers (OSA1 and OSA2), and a Network Vector Analyzer (Rohde&Shwartz ZVA 67).
4：7).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The setup involved injecting light from the master laser into the FP laser cavity, controlling polarization and temperature, and measuring the frequency response for different fiber lengths (10 km, 20 km, 35 km).
5：Data Analysis Methods:
The frequency response was analyzed to observe the effects of chromatic dispersion and laser chirp, with improvements noted in the injection-locked state.
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