Abstract
A Continuous Wave (CW) sub-THz photonic synthesis setup based on a single Passively Mode-Locked Laser Diode (PMLLD) acting as a monolithic Optical Frequency Comb Generator (OFCG) and highly selective optical filtering has been implemented to evaluate the phase noise performance of the generated sub-THz signals. The analysis of the synthesized sub-THz signals up to 120 GHz gives as a result an effective reduction of the electrical linewidth when compared to direct harmonic generation that begins at 50 GHz and becomes greater as the frequency increases. The phase noise reduction offered by the setup, along with its integration potential, cost and bandwidth, make it a promising candidate to the development of an integrated and high performance low phase noise local oscillator in the sub-THz range.
Highlights
Today, the pursue for integrated and cost-effective generation and detection technologies that could allow a widespread access to the potential applications in the sub-THz and THz frequencies has become one of the most active fields of research [1, 2]
The analysis of the synthesized sub-THz signals up to 120 GHz gives as a result an effective reduction of the electrical linewidth when compared to direct harmonic generation that begins at 50 GHz and becomes greater as the frequency increases
The phase noise reduction offered by the setup, along with its integration potential, cost and bandwidth, make it a promising candidate to the development of an integrated and high performance low phase noise local oscillator in the sub-THz range
Summary
The pursue for integrated and cost-effective generation and detection technologies that could allow a widespread access to the potential applications in the sub-THz and THz frequencies has become one of the most active fields of research [1, 2]. A compact setup for CW sub-THz photonic synthesis using an OFCG and highly selective optical filtering [9] is employed to study the phase noise performance of the signals synthesized with this scheme and to compare them with those obtained by direct harmonic generation. In this setup, two optical modes are filtered from a Passively ModeLocked Laser Diode (PMLLD), which is employed as OFCG, and mixed in a fast photodiode to generate an electrical signal with a frequency equal to the frequency spacing between the two optical modes selected. The reported phase noise improvement of CW sub-THz signals synthesized with this setup along with its integration potential, cost and bandwidth capabilities make it a promising candidate to the development of an integrated and high performance local oscillator in the sub-THz range
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