Construct · 2 fields · 2 citations

heterodyne: one construct, many systems

One name. One construct. Different systems. One map.

● invariant · one principle, two domains Nearest construct by meaning·not indexed
same local-oscillator mixing, moved to lightheterodyne2 SYSTEMSRF heterodyneHAYKIN · MIX TO IFOptical heterodyneAGRAWAL · COHERENT

Spokes are the systems the one construct recurs in; dashed arcs are shared lineage. Tap a field for its definition, unit, and measures.

2001RF heterodyne2010Optical heterodyne
2026

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Radio communications

Mix a signal with a local oscillator to shift frequency

In radio, heterodyning combines an incoming signal with a locally generated oscillation in a non-linear mixer, producing sum and difference frequencies; taking the difference shifts the signal to a fixed intermediate frequency that is easier to filter and amplify, which is the basis of the superheterodyne receiver. Haykin's Communication systems develops mixing, image frequencies, and the superheterodyne architecture. The construct is frequency translation by beating a signal against a reference, and the same principle reappears directly in optics as coherent detection.[1]

Unit
The intermediate (difference) frequency produced by mixing signal and local oscillator
Recovery means
Not applicable
Measured by
Characterised by conversion gain, the intermediate frequency, and image and spurious response of the mixer

Photonics

Beat an optical signal against a laser reference

In photonics, optical heterodyne (coherent) detection mixes a received light wave with a local-oscillator laser on a photodetector, whose square-law response produces a beat at the difference frequency that carries the signal's amplitude and phase, giving far greater sensitivity and selectivity than direct detection. Agrawal's Fiber-optic communication systems treats homodyne and heterodyne receivers and their sensitivity gains. The construct is the same local-oscillator mixing as in radio, transposed to optical frequencies, and measured again by the beat it produces rather than by raw intensity.[2]

Unit
The optical beat (difference) frequency recovered at the photodetector
Recovery means
Not applicable
Measured by
Assessed by receiver sensitivity, the beat signal-to-noise ratio, and local-oscillator-limited detection performance

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Nearby constructs

amplitude4 fields · 4 citationsjingle · one word, four constructsarchitecture3 fields · 4 citationsjingle · one word, three constructsbasis3 fields · 5 citationsjingle · one word, three constructssuperheterodyne receiver1 fields · 1 citationsanchor · a standalone construct

References

  1. Haykin, S. (2001). Communication systems (4th ed.). John Wiley & Sons. ISBN 9780471178699
  2. Agrawal, G. P. (2010). Fiber-optic communication systems (4th ed.). John Wiley & Sons. ISBN 9780470505113

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