We report a phase modulation coherent linear phase demodulation (PM-CLPD) analog photonic link (APL) based on an optical phase-locked loop (OPLL). In this work, we mainly focus on the analysis for the impact of different noise sources on the noise floor in particular under different received optical powers. It was found that due to the limited commonmode noise rejection of the balanced detector, an appropriate received optical power should be made of choice in order to prevent the potential dynamic range deterioration. With this scope, experimental investigations have been carried to verify such specified condition at certain system configurations. In addition, to solve the problem of noise deterioration caused by optical amplification in traditional APL, a common optical amplification scheme is incorporated to facilitate the common-mode noise reduction, making the system less sensitive to the extra noise induced deterioration. By taking into account these aspects, an improvement as large as 10dB is demonstrated for the overall system noise floor.
We present a dual-loop composite optical phase-locked loop (OPLL) composed of an acousto-optic frequency shifter based external modulation loop and a piezo based direct modulation loop for the generation of highly coherent swept-frequency fiber laser. It allows offering a larger loop bandwidth and gain, permitting an efficient linearization and coherence enhancement. We have verified experimentally a highly coherent swept-frequency fiber laser with a high fidelity and linearized frequency sweep with sweep range of ~8.2 GHz at ~164 GHz/s sweep rate, accompanied with a peak-to-peak frequency error as low as ~130 kHz. The in-band noise of the coherent beat note has been effective suppressed by almost 60 dB within a loop bandwidth up to ~80 kHz . The proposed linearly swept-frequency fiber laser provides a straightforward optimization of the real-time sweep control and far distance ranging in various scenarios, which is supposed to be a beneficial tool in both industrial and commercial applications.
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