The Optical Networking and Communication
Conference & Exhibition

Los Angeles Convention Center,
Los Angeles, California, USA

Short Courses

SC392 - Digital Coherent Optical Systems 1: Transceiver Technology and Performance

Monday, 21 March
08:30 - 12:30

Short Course Level: Beginner to advanced beginner (basic understanding of topic is necessary to follow course material)


Maurice O'Sullivan; Ciena, Canada

Short Course Description:

Coherent optical transmission is a commercial solution which supports capacity growth in reconfigurable WDM networks at 40 Gb/s and higher capacity. Its implementation follows on available CMOS technology that is capable of digital signal processing (DSP) capacities of multiple terabits per second and co-integration with analog to digital (ADC) and digital to analog (DAC) conversion as well as forward error correction (FEC) functions. Coherent transmission uses the measured optical field envelope which comprises amplitude, phase and polarization. Compared to intensity modulation –direct detection (IMDD), this richer set of measurements allows better use of the available optical spectrum for data transmission i.e. higher spectral efficiency. Measurement of the field instead of just intensity predisposes coherent systems to signal equalization and recovery in the electronic domain. This course examines implementation aspects of electric field transmitters, coherent receivers and the role of transmit and receive DSP for channel equalization and data recovery. The dependence of performance upon the dispersion map and on composition of the wavelength division multiplexed (WDM) spectrum are addressed.

Short Course Benefits:

This course should enable you to:

  • Understand optical field amplitude, phase, polarization and intensity

  • Distinguish IMDD from coherent detection and field modulation

  • Understand the role of DSP in standard coherent transmission

  • Gain exposure to electro-optic technologies used for coherent transmission

  • Learn standard implementations of electric field transmitters and coherent receivers

  • Estimate Q and BER for BPSK, QPSK and 16 QAM  modulations

  • Anticipate relative performances of coherent phase modulated channels vs. dispersion map and WDM channel spectrum


Short Course Audience:

This course is intended for those interested in the workings and estimates of performance of commercial
coherent solutions in a multi-span amplified WDM system. It is recommended to its audience as pre-requisite to SC393. 

Instructor Biography:

For more than 25 years Maurice O'Sullivan has contributed to the design and manufacture of optical fiber and, mostly, the highest capacity long line transmission equipment of its day with emphasis on layer 0. Recent examples include a 40 Gb/s and 100 Gb/s coherent transceiver products. He holds a PhD in Physics from the University of Toronto.

Sponsored by: