Photonic synthesis of THz signals

Seeds, A.J.; Renaud, Cyril C.; Pantouvaki, Marianna; Robertson, M.J.; Lealman, I.F.; Rogers, D. C.; Firth, R.; Cannard, P.; Moore, Richard; Gwilliam, R.

doi:10.1109/eumc.2006.281128

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…These devices were measured for frequency response up to 110 GHz. For these measurements a heterodyne generation system was used [14] that offers high frequency purity from 10 GHz to 1.5 THz. Fig.…”

Section: High-output Power Dc-110 Ghz Photodetectorsmentioning

confidence: 99%

Millimeter-Wave Photonic Components for Broadband Wireless Systems

Stöhr

Babiel

Cannard³

et al. 2010

IEEE Trans. Microwave Theory Techn.

125

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We report on advanced millimeter-wave (mm-wave) photonic components for broadband wireless transmission. We have developed self-pulsating 60 GHz range quantumdash Fabry-Perot mode-locked laser diodes (MLLD) for passive, i.e. unlocked, photonic mm-wave generation with comparably low phase noise level of-76 dBc/Hz @ 100 kHz offset from 58.8 GHz carrier. We further report on high-frequency 1.55 µm waveguide photodiodes (PD) with partially p-doped absorber for broadband operation (f 3dB~7 0-110 GHz) and peak output power levels up to +4.5 dBm @ 110 GHz as well as wideband antenna integrated photomixers for operation within 30-300 GHz and peak output power levels of-11 dBm @ 100 GHz and 6 mA photocurrent. We further present compact 60 GHz wireless transmitter and receiver modules for wireless transmission of uncompressed 1080p (2.97 Gb/s) HDTV signals utilizing the developed MLLD and mm-wave PD. Error-free (BER=10-9 , 2 31-1 PRBS, NRZ) outdoor transmission of 3 Gb/s over 25 m is demonstrated as well as wireless transmission of uncompressed HDTV signals in the 60 GHz band. Finally, an advanced 60 GHz photonic wireless system offering record data throughputs and spectral efficiencies is presented. For the first time, we demonstrate photonic wireless transmission of data throughputs up to 27.04 Gbit/s (EVM 17.6 %) using a 16-QAM OFDM modulation format resulting in a spectral efficiency as high as 3.86 bit/s/Hz. Wireless experiments were carried out within the regulated 57-64 GHz band in a lab environment with a maximum transmit power of-1 dBm and 23 dBi gain antennas for a wireless span of 2.5 m. This span can be extended to some 100 m span when using highgain antennas and higher transmit power levels.

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Section: High-output Power Dc-110 Ghz Photodetectorsmentioning

confidence: 99%

Millimeter-Wave Photonic Components for Broadband Wireless Systems

Stöhr

Babiel

Cannard³

et al. 2010

IEEE Trans. Microwave Theory Techn.

125

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“…To represent a more realistic laser, one can introduce a Lorentzian function to describe the laser operating-mode linewidth and simulate what will happen if this laser has several modes operating at the same time (free running) by summing the FM spectra of each mode. Considering the approximations mentioned above, (1) can be rewritten as (3) where is a Lorentzian function where the mode linewidth is , and we have a total number of modes operating in the laser cavity. Note that (2) remains the same.…”

Section: Principle Of the Fm Sourcementioning

confidence: 99%

A Monolithic MQW InP–InGaAsP-Based Optical Comb Generator

Renaud

Pantouvaki

Grégoire

et al. 2007

IEEE J. Quantum Electron.

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We report the first demonstration of a monolithic optical-frequency comb generator. The device is based on multisection quaternary/quaternary eight-quantum-well InP-InGaAsP material in a frequency-modulated (FM) laser design. The modulation is generated using quantum-confined Stark-effect phase-induced refractive index modulation to achieve fast modulation up to 24.4 GHz. The laser was fabricated using a single epitaxial growth step and quantum-well intermixing to realize low-loss phase adjustment and modulation sections. The output was quasicontinuous wave with intensity modulation at less than 20% for a total output power of 2 mW. The linewidth of each line was limited by the linewidth of the free running laser at an optimum of 25 MHz full-width at half-maximum. The comb generator produces a number of lines with a spacing exactly equal to the modulation frequency (or a multiple of it), differential phase noise between adjacent lines of 82 dBc/Hz at 1-kHz offset (modulation source-limited), and a potential comb spectrum width of up to 2 THz (15 nm), though the comb spectrum was not continuous across the full span. Index Terms-Frequency-modulated (FM) laser, laser diode, optical frequency comb generation. I. INTRODUCTIONM ANY different applications, ranging from dense wavelength-division-multiplexed (WDM) optical communications [1] to photonic THz synthesis [2]-[4], require a reliable and cost-effective frequency reference source. The most reliable sources as frequency reference are atomic or molecular resonances [5], [6]. They also offer a large number of frequency lines in a relatively dense grid [7], [8], However, they are not suitable for integrated systems. Several other solutions have been proposed to provide a regularly spaced frequency comb, such as Manuscript

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“…One was used to test the device from DC to 65 GHz and the other from 70GHz to 110 GHz. The device optical excitation was generated by an optical heterodyne system [5] which offered a tuneable single frequency (<1Hz linewidth) signal with 100% modulation depth from 10 GHz to 110 GHz in steps of 10 GHz. For frequencies below 10 GHz the optical signal was a directly modulated laser.…”

Section: Experiments Descriptionmentioning

confidence: 99%