Comb Line Multiplication in an InP Integrated Photonic Circuit Based on Cascaded Modulators

Bontempi, F.; Andriolli, N.; Scotti, Filippo; Chiesa, Marco; Contestabile, G.

doi:10.1109/jstqe.2019.2911459

Cited by 17 publications

(18 citation statements)

References 23 publications

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“…The InP monolithically integrated optical frequency comb generator 35 , 36 schematic, photography, and chip zoom-in-view are presented in Fig. 2 a–c, respectively.…”

Section: Integrated Ofc-based 5g Nr System: Methods/experimentsmentioning

confidence: 99%

“…The acquired benefits include: moving from several components on bench-top to footprint-reduced chips; operation simplicity; scalability; versatile features for specific types of comb and design parameters; energy saving; tight confinement of light due to the high index contrast, increasing optical nonlinearities, favoring to perform and phase match parametric nonlinear processes 31 , 32 . Then, works on integrated OFCs at the device level have been reported as state-of-the-art in the literature 25 , 31 – 36 . For instance, Hu and Oxenlowe presented a review on chip-based OFCs, in which different types of comb benefiting from silicon, thin-film lithium-niobate, and aluminium gallium arsenide-on-insulator were discussed, as a function of optical linewidth, spectral broadening and carrier-to-noise ratio 33 .…”

Section: Introductionmentioning

confidence: 99%

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Integrated optical frequency comb for 5G NR Xhauls

Lima

Borges

Andriolli

et al. 2022

Sci Rep

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We experimentally demonstrate the use of optical frequency combs (OFCs), generated by a photonic integrated circuit (PIC), in a flexible optical distribution network based on fiber-optics and free-space optics (FSOs) links, aimed at the fifth generation of mobile network (5G) Xhauls. The Indium Phosphide (InP) monolithically integrated OFC is based on cascaded optical modulators and is broadly tunable in terms of operating wavelength and frequency spacing. Particularly, our approach relies on applying the PIC in a centralized radio access network (C-RAN) architecture, with the purpose of optically generating two low-phase noise mm-waves signals for simultaneously enabling a 12.5-km of single-mode fiber (SMF) fronthaul and a 12.5-km SMF midhaul, followed by a 10-m long FSO fronthaul link. Moreover, the demonstrator contemplates two 10-m reach 5G wireless access networks operating in the 26 GHz band, i.e. over the frequency range 2 (FR2) from the 5G NR standard. The proposed integrated OFC-based 5G system performance is in accordance to the 3rd Generation Partnership Project (3GPP) Release 15 requirements, achieving a total wireless throughput of 900 Mbit/s.

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“…The InP monolithically integrated optical frequency comb generator 35 , 36 schematic, photography, and chip zoom-in-view are presented in Fig. 2 a–c, respectively.…”

Section: Integrated Ofc-based 5g Nr System: Methods/experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated optical frequency comb for 5G NR Xhauls

Lima

Borges

Andriolli

et al. 2022

Sci Rep

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“…Fig. 1(a) shows a schematic of the photonic integrated circuit based on cascaded modulators [11] [14] to generate an OFC, which was previously characterized by our research group and reported in [12] and [13]. The device has been realized in an Indium Phosphide multi-project wafer run at Oclaro Technology plc, UK [15] exploiting a generic integration platform.…”

Section: Integrated Optical Frequency Combmentioning

confidence: 99%

“…Photonic integration provides extremely compact and flexible optical frequency combs, enabling the central wavelength, frequency spacing and optical output power adjustment by controlling the photonic integrated circuit (PIC): a wavelength-tunable laser can be used for controlling the comb wavelength, a semiconductor optical amplifier (SOA) adjusts the output power, while the frequency spacing can be broadly tuned by an external RF generator at a relatively low frequency. An ad-hoc combination of the modulating signals can also be exploited in order to perform frequency line multiplication when required [13].…”

Section: Introductionmentioning

confidence: 99%

Low-Phase-Noise Tenfold Frequency Multiplication Based on Integrated Optical Frequency Combs

Lima

Andriolli

Conforti

et al. 2022

IEEE Photon. Technol. Lett.

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We experimentally demonstrate a low-phase-noise tenfold frequency multiplier based on a compact integrated optical frequency comb (OFC) generator. The Indium Phosphide (InP) monolithically integrated OFC is based on a flexible scheme using cascaded optical modulators. The extremely compact frequency multiplier is broadly tunable in wavelength and in OFC repetition frequency, making it interesting for high-spectralpurity mm-waves applications. OFC generation with a 2.6 GHz spacing and 19 tones within a 10 dB power range and an optical signal-to-noise ratio (OSNR) higher than 40 dB is reported. Using a 74 GHz-bandwidth photodetector, we achieve a set of 2.6 GHz phase-stabilized electrical tones, reaching carriers up to 39 GHz with a high signal-to-noise ratio (SNR). In particular, the OFCbased tenfold-multiplied signal (26 GHz) provides a remarkable low-phase-noise feature, equivalent to the commercially available radiofrequency (RF) generator used as a source at the same electrical power. At 26 GHz, phase-noise of -50 dBc/Hz and -80 dBc/Hz are reported for 10 Hz and 1 kHz offsets, respectively. The proposed system enables frequency multiplication up to 12times without phase impairments, i.e., phase noise performance equivalent to a commercial RF generator, validating its potential to low-phase-noise and high-spectral-purity mm-wave applications.Index Terms-5G, mm-waves, optical frequency comb (OFC) and photonic integrated circuits (PIC).

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“…Silicon-on-insulator (SOI) and indium phosphide (InP) are workable platforms for integrating multiple modulators on a single chip, both of which have already been utilized to realize chip-scale electro-optic frequency comb generation [15,16]. In addition, lithium niobate on insulator (LNOI), with a strong electro-optic effect, a large modulation bandwidth, and a broad optical transparent window, is recognized as a promising candidate for realizing power-efficient chip-scale electro-optic frequency comb generation with a large tooth spacing tuning range and a high output power.…”

Section: Introductionmentioning

confidence: 99%

Flat Optical Frequency Comb Generation Based on Monolithic Integrated LNOI Intensity and Phase Modulator

Zhang

Wang

et al. 2022

Photonics

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A flat optical frequency comb (OFC) is generated by using a monolithic integrated electro-optic intensity and phase modulator fabricated on lithium niobite on insulator (LNOI) platform. The LNOI-based modulation chip consists of a push–pull Mach–Zehnder modulator (MZM) and a U-shaped phase modulator (PM) connected by a curved optical waveguide. Microwave and optical packaging are implemented for the modulation chip, where the input and output pigtails of the packaged modulation device are polarization-maintaining fibers, with a core diameter of 6.5 μm. The packaged LNOI-based modulation device is featured by a fiber-to-fiber insertion loss as low as 6.97 dB. The half-wave voltages of the MZM and the PM are measured to be 3.6 V and 3.4 V at 5 GHz, respectively. By using the modulation device, an OFC with a tooth spacing of 5 GHz is generated, and the 13 comb teeth in the generated OFC are with a power flatness of 2.4 dB. The measured results of this device indicate that the tooth spacing of the generated OFC can be extended to tens of gigahertz by using a microwave source with a higher output frequency. In addition, the number of the comb teeth can be enhanced beyond 20 by increasing the power of the radio-frequency signal applied to the PM or by further reducing the half-wave voltage of the PM.

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Comb Line Multiplication in an InP Integrated Photonic Circuit Based on Cascaded Modulators

Cited by 17 publications

References 23 publications

Integrated optical frequency comb for 5G NR Xhauls

Integrated optical frequency comb for 5G NR Xhauls

Low-Phase-Noise Tenfold Frequency Multiplication Based on Integrated Optical Frequency Combs

Flat Optical Frequency Comb Generation Based on Monolithic Integrated LNOI Intensity and Phase Modulator

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