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Optical OFDM - Orthogonality
And now for something completely different… This will be the first of (hopefully) a series of posts that will be an introduction to optical OFDM (or what I have learned in the past half year or so...
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Optical OFDM - OFDM Basics
This post continues the introduction to optical OFDM that I started here. In this post, we’ll discuss what an OFDM symbol looks like and show, starting from the orthogonality condition, that the...
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Optical OFDM - Spectrum
We have seen in this post that the DFT spectrum of a single OFDM symbol is a line spectrum with one line for each subchannel $k$ which carries the modulated data $c_{k}$. Within a single symbol there...
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Optical OFDM - Cyclic Prefix
One of the most common misunderstandings about OFDM that keeps coming in most discussions on the topic is if subchannels are still orthogonal when there is a cyclic prefix involved. But let’s start at...
View ArticleOptical OFDM - Generation
Before we go further into the signal processing topics that started with the cyclic prefix, we shall take a look at how we can generate OFDM signals ready for transmission and then, next, how to get...
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Optical OFDM - Blessings and Curses
Due to the time-distributed nature of the subchannel symbols and the unique algorithm used to demultiplex the compound signal, the influence of various transmission impairments on the subchannel...
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Grand Unified Theory
Bridging the worlds of OFDM (on which I spent the last year) and XPolM (on which I spent the three years before that), I thought it might be interesting to see what an OFDM channel does to an XPolM...
View Articleoptical OFDM - Odds and Ends
This is probably gonna be the last of the OFDM posts around here, since I’m no longer working on OFDM-related topics. The next post was supposed to be about reception of optical OFDM signals, and the...
View ArticleNature Photonics
After what seems (to me) to have been several eons worth of experimenting, writing, re-writing, re-experimenting, more re-writing and then some more re-writing (all of which mostly by others), the...
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Signal Statistics for OFDM
Here is something that recently piqued my interest (and kept me busy for the better part of last week). It could be (marginally) interesting for people which work on OFDM or Nyquist WDM and – as far as...
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