&lt;title&gt;Optical phase-locked loop signal sources for phased-array communications antennas&lt;/title&gt;

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

doi:10.1117/12.279461

Cited by 6 publications

(3 citation statements)

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“…Work on integration is in progress. A MMIC-based O/E phase detector has been implemented [27], [28], and a hybrid integrated and packaged OPLL is under construction [29]. Integration might eventually lead to cost reduction making fiber-optic MW links based on RHD attractive for future specialized MW systems.…”

Section: Discussionmentioning

confidence: 99%

Multifunctional fiber-optic microwave links based on remote heterodyne detection

Gliese

Nielsen

Nørskov

et al. 1998

IEEE Trans. Microwave Theory Techn.

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Abstract-The multifunctionality of microwave links based on remote heterodyne detection (RHD) of signals from a dual-frequency laser transmitter is discussed and experimentally demonstrated in this paper. Typically, direct detection (DD) in conjunction with optical intensity modulation is used to implement fiber-optic microwave links. The resulting links are inherently transparent. As opposed to DD links, RHD links can perform radio-system functionalities such as modulation and frequency conversion in addition to transparency. All of these three functionalities are presented and experimentally demonstrated with an RHD link based on a dual-frequency laser transmitter with two offset phase-locked semiconductor lasers. In the modulating link, a 1-Gb/s baseband signal is QPSK modulated onto a 9-GHz RF carrier. The frequency converting link demonstrates up-conversion of a 100-Mb/s PSK signal from a 2-GHz carrier to a 9-GHz carrier with penalty-free transmission over 25 km of optical fiber. Finally, the transparent link transmits a standard FM video 7.6-GHz radio-link signal over 25 km of optical fiber without measurable distortion.

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Section: Discussionmentioning

confidence: 99%

Multifunctional fiber-optic microwave links based on remote heterodyne detection

Gliese

Nielsen

Nørskov

et al. 1998

IEEE Trans. Microwave Theory Techn.

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“…[2]) but these devices are not well suited to communications equipment due to their large size and poor electrical efficiency. A preliminary discussion of the design of this unit was given in [5]. On the other hand, a diodelaser OPLL [3,4] requires much wider loop bandwidth and special attention is needed to the tuning characteristics and linewidth ofthe laser diodes.…”

Section: Module Designmentioning

confidence: 99%

<title>Development of a packaged optical phase-locked loop for use as a signal source in phased-array communications antennas</title>

et al. 1998

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A packaged diode-laser OPLL sub-system has been constructed for evaluation in a proof-of-concept coherent optical beamforming system. The loop has been implemented with narrow linewidth laser diodes, micro-optics and wide bandwidth electronics to give optimum phase noise performance. The laser diodes are designed for wide bandwidth and high FM-efficiency, whilst the main challenge in the construction of the packaged OPLL is the realisation of a high gain loop, with a small propagation delay. A total phase variance of 0.05 rad2 has been achieved (infinite bandwidth), and that within the 15 MHz system bandwidth is 0.0007 rad2. The OPLL can operate with LO frequencies from 7-15 GHz. This paper details the performance of the completed OPLL module together with key results from the custom FM lasers designed and fabricated for use within it.

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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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<title>Optical phase-locked loop signal sources for phased-array communications antennas</title>

Cited by 6 publications

References 0 publications

Multifunctional fiber-optic microwave links based on remote heterodyne detection

Multifunctional fiber-optic microwave links based on remote heterodyne detection

<title>Development of a packaged optical phase-locked loop for use as a signal source in phased-array communications antennas</title>

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

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