Simultaneous dibit recovery of a DQPSK signal using a single Mach-Zehnder Interferometer

N. Johnson, S. M. Nissanka, T. Nakamura, Marc A. Eberhard, A. Maruta, Keith J. Blow

Research output: Contribution to journalArticlepeer-review


The dibit recovery of a DQPSK signal will be demonstrated using a single Mach Zehnder Interferometer, containing a 1-bit delay, and a single balanced receiver. The electrical output levels of the balanced receiver are dependent upon the relative phase delay between the arms of the Mach Zehnder Interferometer. This paper will investigate this characteristic when the input signal is DQPSK modulated. It will also be shown that with a certain amount of phase shift the DQPSK signal can be converted into four different equally spaced electrical signal levels. With each decoded level representing one of the four possible dibits.
Original languageEnglish
Pages (from-to)321-322
Number of pages2
JournalElectronics letters
Issue number6
Publication statusPublished - 12 Mar 2009


  • simultaneous dibit recovery
  • DQPSK signal modulation
  • single Mach-Zehnder interferometer
  • differential quadrature phase shift keying
  • single balanced receiver
  • phase delay


Dive into the research topics of 'Simultaneous dibit recovery of a DQPSK signal using a single Mach-Zehnder Interferometer'. Together they form a unique fingerprint.

Cite this