# Antoni Emil Karbowiak
**Antoni Emil ("Toni") Karbowiak** was a Polish-born telecommunications engineer (born Warsaw, March 1, 1923; died Sydney, July 2, 2011) who led the waveguide research group at Standard Telecommunication Laboratories (STL) in Harlow, UK, where [Charles K. Kao](https://www.edgepedia.org/charles-k-kao) started under his direction. The Nobel Committee's 2009 scientific background document for the Physics prize credits Karbowiak, alongside J.C. Simon, and [E. Spitz](https://www.edgepedia.org/erich-spitz) at CSF in France, with realizing that propagation of single modes into waveguides, for example thin films, should be beneficial to optical communication by reducing dispersion and propagation losses.[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf)
| Key fact | Detail |
|---|---|
| Born | Warsaw, Poland, March 1, 1923[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) |
| Nobel attribution | Credited in the 2009 Physics background with realizing single-mode propagation in waveguides (thin films) would reduce dispersion and propagation losses for optical communication[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf) |
| Role at STL | Head of the long-haul waveguide group working on millimeter transmission at 35 to 70 GHz; Kao's first supervisor, later succeeded by Kao[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) • [4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) |
| Thin-film waveguide | Designed a ribbon-like guide a fraction of a wavelength thick but many wavelengths wide, calculated for single-mode guidance at a few dB/km; it failed at bends[4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) |
| Move to Australia | 1964, chair of communications at UNSW's School of Electrical Engineering; warned Kao he was "off on a wild goose chase"[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) • [4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) |
| Publications | "A new type of waveguide for light and infrared waves" (Electronics Letters, 1965, 13 recorded citations); "The birth of optical communications" (IEE Proceedings J, 1986)[5](https://doi.org/10.1049/el:19650046) • [6](https://digital-library.theiet.org/doi/10.1049/ip-j.1986.0033) |
| Australian legacy | Founded the 1976 optical-fiber workshop at UNSW that became the Australian Conference on Optical Fibre Technology[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) |
## Early life, education, and path to STL
Karbowiak was born in Warsaw on March 1, 1923, the son of a commerce teacher, Tadeuz Karbowiak, and Eugenia von [Friedberg](https://www.edgepedia.org/friedberg).[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) At STL in Britain he was in charge of telecommunications research.[7](https://www.smh.com.au/national/pioneer-of-optical-communications-20110810-1imrc.html) [The Sydney Morning Herald](https://www.edgepedia.org/the-sydney-morning-herald) obituary records that his early research helped with the technology of the optical cable.[7](https://www.smh.com.au/national/pioneer-of-optical-communications-20110810-1imrc.html)
## STL in the early 1960s: from millimeter waveguides to optics
Kao joined STL in 1960 and entered the long-haul waveguide group led by Karbowiak, which worked on millimeter wave transmission at 35 to 70 GHz.[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) The timing matched the laser's arrival: Karbowiak asked Kao to look at an optical analog of a microwave waveguide, since optical signals at hundreds of terahertz can carry more information.[8](https://www.nature.com/articles/d41586-018-07355-4) The group also tried guiding light through sequences of lenses or gas tubes, without much success.[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf) • [9](https://optics.org/article/40608)
## The single-mode insight and the thin-film waveguide
**The insight.** The Nobel background states the core idea: propagating a single mode in a waveguide was expected to reduce dispersion and propagation losses, making it beneficial for optical communication.[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf) Karbowiak asked Kao, then 30, and [George Hockham](https://www.edgepedia.org/george-hockham), just 25, to calculate the properties of single-mode fibers.[4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/)
Kao's eventual single-mode design had a light-carrying core of about 1/100th of a millimeter diameter, a vision history vindicated but hard to sell at the time.[10](https://royalsocietypublishing.org/doi/10.1098/rsbm.2020.0006) The motivation was stark: the first optical fibers attenuated typically 1000 dB/km, so only 1 percent of light was transmitted in twenty meters of fiber.[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf)
**The thin-film attempt.** Karbowiak suggested that Kao and three others work on his idea of a thin film waveguide.[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) He designed a bare ribbon-like waveguide a fraction of a wavelength thick but many wavelengths wide, calculated to guide a single optical mode with absorption losses of only a few dB/km.[4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) The experiment failed: when the ribbon was put on a curved support, it sprayed red light from a helium-neon laser all over the lab, because confinement was not strong enough and light escaped at bends.[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) • [4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/)
## Departure for Australia and the end of the collaboration
In 1964 Karbowiak accepted the chair of communications at UNSW's School of Electrical Engineering.[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) Before he left he warned Kao, "you're off on a wild goose chase" with optical fibers; Kao then took over the research group, which at first had only one coworker, G.A. Hockham.[4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) • [1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf)
## Karbowiak's publications versus the 1966 Kao–Hockham paper
Karbowiak's own waveguide papers bracket the thin-film work. "A new type of waveguide for light and infrared waves" appeared in *Electronics Letters* 1(2), pp. 47–48, in 1965; the database record dates it to April 1, 1965 and lists 13 citations, with attenuation of a few decibels per kilometer theoretically achievable with properly chosen dimensions.[6](https://digital-library.theiet.org/doi/10.1049/ip-j.1986.0033) • [5](https://doi.org/10.1049/el:19650046) In 1986 he published the history article "The birth of optical communications" in IEE Proceedings J, covering the early examination of a variety of options culminating in a commitment to optical fibers and the birth of commercial systems.[6](https://digital-library.theiet.org/doi/10.1049/ip-j.1986.0033)
The Kao–Hockham paper "Dielectric-Fibre Surface Waveguides for Optical Frequencies" was first received on 24 November 1965 and in revised form on 15 February 1966, with both authors formerly of STL, Harlow, Essex.[11](http://www.fisicafundamental.net/relicario/doc/Kao-1966.pdf) Kao's own lecture says the paper appeared in July 1966 in the *Proceedings of the IEE*, a date he calls the birth of optical fiber communication.[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf)
## Career and legacy in Australia
In 1976, as a member of the then Radio Research Board, he was instrumental in establishing the first optical-fiber workshop at the university, which developed into the Australian Conference on Optical Fibre Technology.[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737)
## How the credit was divided, and what remains open
The division of credit is visible in the documents themselves. The Nobel background credits Karbowiak with the single-mode realization but attaches the prize narrative to Kao, who started under Karbowiak's direction and then led the small group that produced the 1966 loss analysis.[1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf) Kao referred to Professor Karbowiak in his 2009 Nobel acceptance speech, and his lecture credits Karbowiak with both the thin-film idea and the assignment of the single-mode calculations to Kao and Hockham.[2](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737) • [3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) The thin-film waveguide failed experimentally and Karbowiak left for Australia in 1964, two years before the 20 dB/km paper, leaving Kao and Hockham to carry the fiber work forward.[3](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf) • [4](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/) • [1](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf)
## References
1. [Scientific Background on the Nobel Prize in Physics 2009, Nobel Committee](https://www.nobelprize.org/uploads/2018/06/advanced-physicsprize2009-1.pdf)
2. [Obituary: Antoni Emil (Toni) Karbowiak, Obituaries Australia (ANU)](https://oa.anu.edu.au/obituary/karbowiak-antoni-emil-toni-16737)
3. [Nobel Lecture by Charles K. Kao, Nobel Foundation](https://www.nobelprize.org/uploads/2018/06/kao_lecture.pdf)
4. [The Remarkable Fiber Optic Vision of Charles Kao, Optics & Photonics News (Hecht, 2019)](https://www.optica-opn.org/home/articles/volume_30/march_2019/features/the_remarkable_fiber_optic_vision_of_charles_kao/)
5. [New type of waveguide for light and infrared waves, Electronics Letters (database record)](https://doi.org/10.1049/el:19650046)
6. [A.E. Karbowiak, "The birth of optical communications", IEE Proceedings J, 1986](https://digital-library.theiet.org/doi/10.1049/ip-j.1986.0033)
7. [Pioneer of optical communications, Sydney Morning Herald obituary](https://www.smh.com.au/national/pioneer-of-optical-communications-20110810-1imrc.html)
8. [Kuen Charles Kao (1933–2018), Nature](https://www.nature.com/articles/d41586-018-07355-4)
9. [Optics pioneers scoop Nobel prize, optics.org](https://optics.org/article/40608)
10. [Sir Charles Kuen Kao, Biographical Memoirs of Fellows of the Royal Society](https://royalsocietypublishing.org/doi/10.1098/rsbm.2020.0006)
11. [Kao & Hockham, "Dielectric-fibre surface waveguides for optical frequencies", Proceedings of the IEE, 1966](http://www.fisicafundamental.net/relicario/doc/Kao-1966.pdf)
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*Topic: Encyclopedia › Technology and the built world › Engineers and computer scientists › Engineers and materials scientists › Researchers in electrical engineering, semiconductors, communications, and signal processing › Telecommunications and fiber-optic systems*
*Initially written Oct 10, 2026 · Edited: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license