The Optical Networking and Communication
Conference & Exhibition

San Diego Convention Center,
San Diego, California, USA

SC446 - Hands-on: Characterization of Coherent Opto-electronic Subsystems

Monday, 09 March
08:30 - 12:30

Short Course Level: Advanced Beginner and Intermediate


Harald Rohde and Howard Wang; Elenion, Germany​

Short Course Description:

As demand for network bandwidth continues to grow unabated, coherent optical communication systems – once limited to the domain of long-haul transmission systems – are finding increasingly widespread deployment at scale, from metro/regional networks to data center interconnects.

However, the key figures of merit against which optoelectronic components for coherent optical communications systems need to be assessed differ significantly from that of traditional direct-detect optical systems.

In this course, we will discuss the main characteristics of lasers, IQ-modulators, and integrated coherent receivers (ICRs) and elaborate on how to appropriately measure and characterize their key properties. Advantages and disadvantages of different measurement techniques will also be discussed.

In a hands-on section, the instructors will present and explain a setup for laser and ICR characterization. Selected parameters of several lasers and of an ICR will be characterized live, with actual test equipment. 

Many key properties can only be extracted from measured data by extensive signal processing. Therefore, measurement methods and accompanying MATLAB/Octave or Python scripts will be demonstrated. The respective algorithms and sample code will be provided.

Participants are encouraged to bring their own laptops so that they can evaluate the data obtained from the measurement setup.

Please note that, due to logistical limitations, only one measurement setup will be available. Also note that the course is focused on the physical properties of optoelectronic components for coherent systems. DSP-related topics will not be covered.

Component parameters are typically specified to ensure the required performance of a subsystem. The interdependence of component parameters and system performance can be evaluated by numerical models. To the interested audience, we recommend SC 395, which focuses on the modeling and simulation of optical transmitter and receiver components, as a relevant supplement to this course.

Short Course Benefits:

This course will provide participants with an understanding of the key properties of optical components essential for coherent communication systems. The participants will be able to measure those properties and to evaluate the results in the right context. They will gain a better understanding of component specifications and will gain the ability to determine component specifications themselves.

Short Course Audience:

This course targets researchers and system designers who want a better grasp of coherent optoelectronic component properties and to understand the properties’ interdependencies.

Instructor Biography:

Harald Rohde has worked on the simulation of photonic transmission systems since he joined Siemens in 2001 after receiving his PhD in physics. He followed the various mergers and company splits through Siemens Networks, Nokia Siemens Networks, and Coriant. Then in 2016, he joined Elenion Technologies. He was worked on coherent systems for access and later moved on to coherent long-haul systems. He has developed and implemented his own tools to focus on the special needs of the development of a coherent optical access system.  Now he is working on the design and characterization of components for coherent communication systems. He has more than 70 publications and holds more than 50 patents. He is senior member of IEEE.

Howard Wang earned his BS, MS and PhD in Electrical Engineering from Columbia University, where his work focused on photonic-network and switch architectures for High Performance Computing and data center applications. He joined the Network Architecture and Engineering team at Bank of America in 2013, where he was responsible for the redesign and build-out of the bank’s nationwide metro DWDM network. He also led initiatives in network automation and their hybrid cloud strategy. Howard joined Elenion Technologies in 2018 and is responsible for application engineering across the company’s product portfolio, including the integration and testing of Elenion's coherent engines with all merchant DSPs currently available on the market. He has more than 40 publications in scientific journals and conferences proceedings.

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