Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1989-09-01
1991-08-20
Arnold, Bruce Y.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359278, 359248, 359350, G02F 1015
Patent
active
050408593
ABSTRACT:
An infra red radiation modulator comprises a p type silicon substrate 1 having spaced n type and p type doped regions 2, 3 having respective doping concentrations of approximately 10.sup.20 and 10.sup.16 /cm.sup.3. A signal source 11 provides a bias voltage between the doped regions 2,3 via electrodes 4 for modifying the concentration of free carriers in the substrate between the doped regions and therefore the response of the modulator to incident infra red radiation. By appropriate control of the bias voltage the modulator can be caused to modulate, chop, filter or spectrally scan the incident radiation.
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Arnold Bruce Y.
Lerner Martin
Thorn Emi plc
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