Widely Tunable Amplified Feedback Laser With Beating-Frequency Covering 60-GHz Band

Abstract

A monolithic integrated amplified feedback laser is experimentally demonstrated as a new solution to generate dual-mode lasing with a wide frequency tuning range covering the entire 60-GHz band. This laser consists of a complex-coupled distributed feedback laser (DFB) and an integrated feedback cavity formed by a phase section and an amplifier section. Different laser sections are integrated by a simple quantum well intermixing (QWI) technique. By tuning the injection currents of the laser sections, the beating-frequency can be continuously tuned from 46.8 to 72 GHz with a 3-dB linewidth below 5 MHz. Benefit from the simple fabrication process and wide tuning range, the device will be a potential candidate for hybrid fiber-wireless access network and high frequency optical microwave generation.Index Terms-Millimeter-wave generation, Dual-mode Laser, Radio-over-fiber.

A Widely Tunable Optoelectronic Oscillator Based on Directly Modulated Dual-Mode Laser

“…The tuning range of this OEO scheme is determined by the frequency tuning range of the AFL. Since the AFL-structure can work in other frequency ranges, like 10-GHz, 20-GHz, and 60-GHz, through choosing appropriate cavity length [22]- [24], the proposed OEO scheme can be easily extended to many other frequency-bands. Moreover, it is also technologically possible to integrate the optical coupler, resonator and the PD with the AFL to form a single chip OEO.…”

A Monolithically Integrated Laser-Photodetector Chip for On-Chip Photonic and Microwave Signal Generation

“…Due to the amplitude imbalance and the lack of coherence of the two laser modes, the temporal waveform does not show a well-defined sinusoidal shape, and the corresponding phase portrait also shows a limit cycle feature, but the traces are broadened compared to the P1 state. In our previous work [7,25,26], we have theoretically and experimentally demonstrated that in the dual-mode state, the beating frequency of the AFL's emission increases with the increase of the feedback strength as I A increases. The relationship between the frequency of the on-chip generated microwave signal and I A of the integrated laser-photodetector chip was investigated by increasing I A from 24.5 mA to 50.5 mA with a 2-mA step.…”