&lt;title&gt;Development of a packaged optical phase-locked loop for use as a signal source in phased-array communications antennas&lt;/title&gt;

Langley, L.N.; Edge, C.; Wale, M.J.; Gliese, U.; Seeds, A.J.; Huang, Xuan; Wright, James G.; Coryell, Louis

doi:10.1117/12.330389

Cited by 3 publications

(2 citation statements)

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“…The first fully packaged OPLL based on two semiconductor lasers functioned as a microwave photonic transmitter generating carriers in the range of 7 GHz to 14 GHz [52], [53]. System IV in Table I was based on two lasers with a free-running summed linewidth of 6 MHz, and the OPLL had a feedback bandwidth of 70 MHz.…”

Section: Early Workmentioning

confidence: 99%

Integrated Semiconductor Laser Optical Phase Lock Loops

Bałakier

Ponnampalam

Fice

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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An Optical Phase Lock Loop (OPLL) is a feedback control system that allows the phase stabilization of a laser to a reference laser with absolute but adjustable frequency offset. Such phase and frequency locked optical oscillators are of great interest for sensing, spectroscopy, and optical communication applications, where coherent detection offers advantages of higher sensitivity and spectral efficiency than can be achieved with direct detection. As explained in this paper, the fundamental difficulty in realising an OPLL is related to the limitations on loop bandwidth and propagation delay as a function of laser linewidth. In particular, the relatively wide linewidth of semiconductor lasers requires short delay, which can only be achieved through shortening of the feedback path, which is greatly facilitated through photonic integration. This paper reviews the advances in the development of semiconductor laser-based OPLLs and describes how improvements in performance have been enabled by improvements in photonic integration technology. We also describe the first OPLL created using foundry fabricated photonic integrated circuits and off-the-shelf electronic components. Stable locking has been achieved for offset frequencies between 4 and 12 GHz with a heterodyne phase noise below -100 dBc/Hz at 10 kHz offset. This is the highest performance yet reported for a monolithically integrated OPLL and demonstrates the attractiveness of the foundry fabrication approach.Index Terms-Optical phase locked loops, photonic integrated circuits, semiconductor laser, microwave photonics.

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Section: Early Workmentioning

confidence: 99%

Integrated Semiconductor Laser Optical Phase Lock Loops

Bałakier

Ponnampalam

Fice

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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“…In this paper, we present the first fully packaged semiconductor laser OPLL microwave photonic transmitter. The entire OPLL transmitter has been successfully designed [49] and constructed [50], [51] in one fabrication run. It is implemented with two custom-designed three-electrode distributed feedback (DFB) lasers, bulk microoptics, and a combination of discrete and integrated-loop electronics.…”

Section: Introductionmentioning

confidence: 99%

Packaged semiconductor laser optical phase-locked loop (OPLL) for photonic generation, processing and transmission of microwave signals

Langley

Elkin

Edge

et al. 1999

IEEE Trans. Microwave Theory Techn.

124

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In this paper, we present the first fully packaged semiconductor laser optical phase-locked loop (OPLL) microwave photonic transmitter. The transmitter is based on semiconductor lasers that are directly phase locked without the use of any other phase noise-reduction mechanisms. In this transmitter, the lasers have a free-running summed linewidth of 6 MHz and the OPLL has a feedback bandwidth of 70 MHz. A state-of-the-art performance is obtained, with a total phase-error variance of 0.05 rad 2 (1-GHz bandwidth) and a carrier phase-error variance of 72 2 210 04 rad 2 in a 15-MHz bandwidth. Carriers are generated in the range of 7-14 GHz. The OPLL transmitter has been fully packaged for practical use in field trials. This is the first time this type of transmitter has been fabricated in a packaged state which is a significant advance on the route to practical application.

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