Gabor Jaro- PhD
- Chief Architect at Nokia
Gabor Jaro
- PhD
- Chief Architect at Nokia
About
76
Publications
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383
Citations
Introduction
Current institution
Additional affiliations
January 1999 - March 2015
Publications
Publications (76)
Cloudification of telecommunication network
elements has been started simultaneously with the introduction of
4G mobile systems. In the past decade, vendor specific physical
network functions experienced a massive migration onto the cloud.
Data Centers and cloud technology, that originally provided
technical solutions for the IT (Information Techno...
Our long journey on the road of telecommunications is continuously evolving. We have experienced several technological changes, modernizations, optimizations, and various mergers in the past decades. Virtualization and ‘cloudification’ of legacy telecommunication equipment has made communication networks not only more flexible, but also opened new...
The excursion on the long road of telecommunications is continuously evolving. Newer mobile generations, optimizations, modernizations, technology changes, and various mergers have been experienced in the past decades. Different drivers continuously shift physical network elements towards software (SW) only deployments in all IP telecommunication n...
Broadband access at a specific location for a customer that meets bandwidth, availability, and latency requirements requires connection to a datacenter or in general to the world (wide web) in a limited timeframe. Whenever wired (fiber-optical) solution is not available, the quick solution is a point-to-point radio access from the existing backhaul...
There are multiple drivers of moving away from physical implementation of telecommunication network elements towards software (SW) only deployments in all IP networks. One of the major motivations is the possibility to use commercial IT hardware as platform, due to cost efficiency and the common required experience for hardware (HW) operation and m...
Ultra-reliable low latency (uRLL) communication in 5G dictates the deployment of distributed infrastructure with numerous datacenters for low latency, while hosting ultra-reliable services mandates attended datacenters. This would boost the operational costs of 5G network operators planning country-wide coverage for uRLL services. This paper examin...
As the distributed software and micro-service architecture is spreading, the importance of load distribution is increasing. There are multiple indicators to measure the quality of the distribution, in the past the main interest was load balancing, i.e. evenly distributing the load among available units. In this paper another aspect is investigated,...
Both hardware and software architectures have to meet the strict requirements for high availability. High availability requires considerations already in the design phase of the products. There are practical rules in system design, such as avoiding single points of failures. In general, the application of redundancy methods can increase overall ava...
Availability and reliability considerations are discussed in this paper with special focus on cloud based Mobile Switching and Telecommunication Application Servers (MSS and TAS). Before the extensive deployment of cloud based telecommunication networks, the essential question shall be answered: Will cloud technology ensure the carrier grade requir...
Future wireless communications are being pushed to broadband communications with rates well above Gb/s. Millimeter wave access systems require innovation in optical and electronic hardware as part of the front end subsystems. This workshop addresses system architectures and performance of the front end opto-electronics that could meet information t...
High sensitivity reception is a crucial problem of fiber radio links. A significant improvement is obtained by applying a new approach called optical-microwave double mixing. The new approach can provide as much as 30 dB of higher mixing product in a narrow-band compared with the direct detection applying only additional passive components. Detaile...
An optical carrier generation approach is presented for cellular millimeter-wave radio systems. The well-known methods distribute the millimeter wave signal via fibers. They have drawbacks because they need very high-speed photonic compo nents that are expensive. This problem is overcome by the new approach utilizing an optically transmitted low-fr...
New methods for optical millimeter wave generation are presented.
They apply a harmonic oscillator stabilized to an optically transmitted
subharmonic reference signal by a frequency division PLL. A 94 GHz
signal was generated using both injection and phase locking techniques.
The new approaches utilize inexpensive photonic components and exhibit
lo...
An optical millimeter wave generation approach is presented for
cellular mobile systems. The well-known methods distribute the
millimeter wave signal via fibers. They have drawbacks because they need
very high speed photonic components which are expensive. That problem is
overcome by the present approach utilizing an optically transmitted
low-frequ...
High sensitivity reception is a crucial problem of optical communications. The proposed optical-microwave double mixing method can provide 30 dB higher mixing product in a narrow band compared to the direct optical detection. This method can be advantageously used for the reception of subcarrier multiplexed optical signals.
A novel optical cellular millimeter wave radio system is presented. The well-known methods in which the millimeter wave signal is distributed via a fiber have many drawbacks because they need very high speed photonic components. These problems are overcome by the new approach which utilizes a low frequency reference signal to phase lock a millimete...
Noise of high speed optical receivers
The optical beam forming of phased array antennas is a very promising technique because of the advantages of the fibre optic signal transmission and the optical control of microwave monolithic integrated circuits (MMICs). In this paper a new approach is presented for the optical generation of millimetre waves (MMW) with the intention to feed the ph...
The widely used optical receivers apply mainly photodiodes to detect the optical intensity modulated signal. A relatively high sensitivity is achieved by properly matched transimpedance or distributed amplifiers [1-3]. In another method the modulated optical signal is mixed with a microwave signal in the photodiode producing an intermediate frequen...
A new approach for the design and construction of low noise broadband optical receivers is presented utilizing distributed amplification based on hybrid integrated technology. Using extremely low noise PHEMTs as well as appropriate matching circuits between the photodiode and the distributed amplifier result in a fairly low input equivalent noise c...
In the proposed picocellular radio system a microwave reference
and subcarrier multiplexed radio signals are distributed optically. The
millimeter-wave carrier is generated by phase locking technique. This
approach is not affected by dispersion and utilizes inexpensive devices
A new approach is presented for the design of harmonic microwave or millimeter wave (MAW) VCOs. The active element of the oscillator circuit is driven into saturation and below pinch-off at the positive and negative peaks of the output signal, respectively. This strongly nonlinear operation is achieved by applying strong feedback. The operation poi...
High sensitivity reception is a crucial problem of optical
communications. A significant improvement is obtained by a new approach
applying a double optical-microwave mixing method for this purpose. The
new approach provides 20 dB higher mixing product in a narrow band
A new approach for the design and construction of low noise broadband optical receivers is presented utilizing distributed amplification based on hybrid integrated technology. Using extremely low noise PHEMTs as well as appropriate matching between the photodiode and the distributed amplifier result in a fairly low input equivalent noise current (1...
The gain-bandwidth relations of distributed amplifiers (DA) are
analyzed If is shown that the amplifier performance is uniquely related
to the properties of the active elements and the electrical length of
the transmission lines between them. It is proved that the parasitic
inductance of the connections between the embedding network and the
transis...
In this paper a brief description will be given about the structure of scatterometer systems, the main principles on which these instruments are based and the areas where scatterometers can be used. The microwave, analogue and digital circuits of the scatterometer that has been built will be presented. The I/Q detector that is the base of the whole...
First Page of the Article
Optical responsivity and electrical reflection of an ultra high-speed pin photodiode (PD) are measured in 20 GHz frequency range. The effect of PD bias voltage variation was investigated at different incident optical power levels. Based on the measurements an equivalent circuit is developed by optimization. The effect of the bonding wires connectin...
The design and experimental investigations of a harmonic microwave oscillator is presented. The transistor oscillator was designed to operate at the fundamental frequency with high third harmonic output. The final goal is to utilize the constructed circuit in a combined millimeter-wave / optical system for picocell applications presented below.
In the paper the gain-bandwidth relations of microwave distributed amplifiers are analyzed. It is shown that in case of proper realization corresponding to distributed amplifier (DA) requirements the amplifier gain and bandwidth is uniquely related to the transconductance and
Mixing of lightwaves and microwaves offers new perspectives for the reception of subcarrier multiplexed (SCM) optical signals, Berceli (1). The received signal can be selected more easily and thus the receiver is significantly simplified. The new mixing method applying high-speed photodiodes presented in the paper is very promising because of its r...
A two stage microwave hybrid integrated distributed amplifier with a gain of 7 ± 1 dB and a noise figure better than 5.2 dB in the 0.2–11 GHz band and better than 3 dB in the 7.5–11 GHz subband is reported. The amplifier was realized by PHEMTs.
Input-reduced noise current density of a distributed amplifier excited by a photodiode is minimised. It has been found that for low noise the admittance of the transmission line between the amplifier and the pin photodiode has to be small. To prove this statement we have obtained an analytical formula for the input-reduced noise current density of...
