Expert Session: Optical Fiber Coupling to Photonic Chips

#1 Expert Session of Series »IZM Photonics: IN GLASS WE TRUST«
Speaker: Wojciech Lewoczko-Adamczyk, Fraunhofer IZM
Exact knowledge of the near-field radiation profiles of chip-integrated optical waveguides is essential for maximizing the fiber-to-chip coupling efficiency through a proper selection of chip-external coupling components, e.g. micro-lenses or spot-size-converting waveguides. In this online-seminar we will revise basic methods for optical characterization of integrated optical waveguides as well as the ways to increase the fiber-chip coupling efficiency.
#photonics #microelectronics #chips #hardware
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[@meetoptics]

This are the kind of presentation that photonics field needs to approach society and make people understand how our lives may improve thanks to scientific innovations and the engagement of more and more people. From MEETOPTICS we are proud to be part of the photonics community and to help engineers and researchers in their search for optical lenses through our site. We celebrate every step forward and we hope new people join our community every day!

[@guanchen4810]

Thanks for the sharing.

[@gaussdog]

I lived in Germany and went to public German school from the age of kindergarten through third grade… I completely forgot how you can just take 17 words and stick them together and make one word in German, until I started reading the closed captions
Great Vid! Thanks

[@T.R.A.I.N.I.N.G.]

agglutination; aufhebe.

[@mishuk2008]

At 5:39, I was expecting a sum of the field integrals in the dominator. Can you please explain why I am wrong? Thanks so much!

[@Fraunhofer-IZM]

Hi Paul Tuhin, Please find here the feedback from Wojtek regarding your question: The easiest argumentation is the check of units: if there was a sum, instead of product, in denominator, the coupling efficiency would not be unitless. For more detailed mathematical treatment please search textbooks or internet for “mode overlap integral” or “projection of wave function onto eigenstates”. Note that the mentioned wave function represents the amplitude of electric field. For calculating the power coupling efficiency you need the integrals of the square of electric field.

[@namigalasgarzade7727]

May I ask when the glass integrated waveguides seminar will take place?

[@Fraunhofer-IZM]

Dear @Namig Alasgarzade. The online workshop series has ended for the time being under the title »IZM Photonics: IN GLASS WE TRUST«. You can find all the other online seminars of the series on our youtube channel or on our website: www.izm.fraunhofer.de/en/news_events/trainings-and-workshops/online-sessions--izm-photonics-in-glass-we-trust.html. Stay tuned about our next online workshop series named: "»IZM PHOTONIK PACKAGING: IN OPTICAL INTERCONNECTS WE TRUST« with more interessting speakers and topics about the photonic interconnection technologies at Fraunhofer IZM.

[@miles2378]

4:49 why did they not make the Silicon waveguide the same width as the fibet?

[@Fraunhofer-IZM]

Hi Christopher Bloom, please find below the answer from our colleague Wojciech Lewoczko-Adamczyk:
This is a very good question and the problem is well known. For some years there have been a quest among Si-PICs manufacturers to reach the goal of matching the model size of the PIC-waveguide to that of a fiber. Some attempts are "almost there" however the reason for "almost" is of technological nature: the thickness of the Si or oxide layers cannot be arbitrary and this limits the expansion of the beam size. At least at telecom wavelengths. On the other side of the coupling interface there are efforts to minimize the mode size of the fiber by using adiabatic spot-size converters, UHNA-fibers or lens fibers.
Best regards

[@miles2378]

@@Fraunhofer-IZM thank you.

[@steveschiets8031]

Are you familiar with polymers?

[@Fraunhofer-IZM]

@Steve Schiets we´re very happy about your comment. To answer your question, their will be another webinar in August about polymers itself by Dr. Alethea Vanessa Zamora Gómez. If you want to get in contact with her earlier you find her contact information here: www.izm.fraunhofer.de/en/abteilungen/system_integrationinterconnectiontechnologies/arbeitsgebiete/photonic-packaging/optische-sensorik.html

[@mbuchwald_atg]

Schau an, ein Silikon-Photonik-Chip bei 02:58🤦