We are pleased to announce and invite you to one of our weekly online zoom events.
 

What is the difference between Shot Noise and Johnson Noise?

In electrical engineering we learn about shot noise (current spectral density of 2eI) and Johnson noise (spectral density 4kT/R), two dominant noise sources.Shot noise is usually derived from a microscopic picture whereas Johnson noise is usually derived through a collective thermodynamic approach and thus they seem unrelated.
We discuss a simple microscopic derivation of the Johnson noise based on shot noise, showing that they have the same origin. This connection is yet, in addition to the well know relation between drift and diffusion coefficient, another manifestation of the fluctuation dissipation theorem

Speaker

Christoph S. Harder, Ph.D.
Christoph Harder received the EE Diploma in 1979 (ETH, Zurich) and from Caltech (Pasadena) Master (1980) and PhD (1983) and has completed the Darden Graduate School of Business Administration TEP (2001). 
He has held staff and management positions at ETH, Caltech, IBM (Switzerland and USA), Uniphase, JDSU, Nortel, Bookham and Trumpf. He is co-founder of the IBM Zurich Laser Enterprise which pioneered the 980nm high power pump laser for EDFAs for which he received the IEEE/LEOS Aaron Kressel Award. Presently is Principal Partner at Harder&Partner. 
Christoph has published more than 150 reviewed papers, been granted more than 20 patents, and authored three book chapters. He was Program and General Chair of the IEEE Photonics Annual Meeting, the International Semiconductor Laser Conference, the Optica FIO, and ECOC. Christoph is IBM Master inventor, Optica Fellow, member of SPIE and IEEE Photonics.
He has been on the board of JDSU/ Nortel/Bookham, Switzerland AG, IEEE Photonics, Optical Society of America and Photonics21. At present he is on the board of BHL AG, Swissphotonics and Optica PAC and on the scientific advisory board of Lightwave Logic and Opsys-tech.


Moderator

Dr. Christian Bosshard, Managing director Swissphotonics
Dr. Christian Bosshard received his degree in Physics (1986) and his doctorate (1991, Silver medal award) from ETH. From 2001-2021 he was working at CSEM, first as Section Head and then as Vice President and Head Photonics. Since 2013 he is Managing Director of Swissphotonics. Christian is a Fellow of Optica, Board Member of EPIC, and Member of the Board of the University of Basel.

Date
Tuesday, 2 May 2023

Time
12:00 - 12:45

Software
Zoom

Costs
free of charge

Registration only necessary once
This event series requires registration (see link above). We will send you the access information (Zoom-link and ID) by email after the registration. As the Zoom link remains the same every week, you do not need to register again for the following meetings.

Contact
Dr. Christoph Harder
President Swissphotonics

Contact Swissphotonics
Dr. Christian Bosshard
Managing Director Swissphotonics
+61 455 957 792

20 April 2023, Christian Bosshard