Information, resolution, and space-bandwidth product

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Abstract

The information capacities of two-dimensional optical low-pass channels are discussed. Coherent and incoherent systems operating under finite optical power and area constraints are characterized in terms of two criteria: space-bandwidth product (SBP; the number of pixels required for achieving maximum information capacity) and resolution (Gmin; the smallest spot size capable of supporting positive capacity gain). A coherent system operating with an initial signal-to-noise ratio (SNR) of 5 can achieve a 48% capacity gain by operating at an optimal SBP that is 3.4 times that of the nominal system. The same system has a resolution that is 0.31 times nominal. Incoherent systems experience additional SNR loss, and with an initial SNR of 5 they achieve capacity gains of 29% at the optimal SBP of 2.8 times nominal. The incoherent system resolution is found to be 0.4 times nominal.

Original languageEnglish (US)
Pages (from-to)1477-1479
Number of pages3
JournalOptics letters
Volume23
Issue number18
DOIs
StatePublished - Sep 15 1998

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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