Comparison of WDM/Pulse-Position-Modulation (WDM/PPM) with Code/Pulse-Position-Swapping (C/PPS) Based on Wavelength/Time Codes
- Resource Type
- Conference
- Authors
- Source
- Conference: Presented at: Avionics, Fiber-Optics and Photonics Conference 2009, San Antonio, TX, United States, Sep 22 - Sep 24, 2009
- Subject
- 42 ENGINEERING A CODES
DETECTION
FIBER OPTICS
FIBERS
MODULATION
PERFORMANCE
SYNCHRONIZATION
WAVELENGTHS
- Language
- English
Pulse position modulation (PPM) signaling is favored in intensity modulated/direct detection (IM/DD) systems that have average power limitations. Combining PPM with WDM over a fiber link (WDM/PPM) enables multiple accessing and increases the link's throughput. Electronic bandwidth and synchronization advantages are further gained by mapping the time slots of PPM onto a code space, or code/pulse-position-swapping (C/PPS). The property of multiple bits per symbol typical of PPM can be combined with multiple accessing by using wavelength/time [W/T] codes in C/PPS. This paper compares the performance of WDM/PPM and C/PPS for equal wavelengths and bandwidth.