Optical power meter using low-power measurement circuit

Details Optical power meter using low-power measurement circuit Optical power meter using low-power measurement circuit

1996-12-31

1998-01-13

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

385 32, G02B 626

Patent

active

057082650

ABSTRACT:
A battery or solar-powered apparatus for measuring and displaying optical power transmitted through an optical fiber. The apparatus has a measuring circuit comprising an optical detector (602), a current/voltage converter (704) and a control circuit (702) which provides timing signals and controls the power applied to the measuring circuit. The apparatus is secured within a housing (102) and is sufficiently small and light such that permanent, in-line attachment to the optical fiber is possible. In a first embodiment, a voltage proportional to the measured optical power is available at an output jack (214) attached to the housing (102). The jack further comprises a switch (1760) which enables power to the apparatus during a measurement period. An alternative embodiment comprises an analog/digital converter (1202) which provides a digital representation of the measured optical power. Low-power displays, such as liquid crystal displays (112, 312), provide direct visual output of the digitized representation of the measured optical power, selectably in units of dBm/dB.

REFERENCES:
patent: 4768854 (1988-09-01), Campbell et al.
patent: 5039188 (1991-08-01), Williams
patent: 5080506 (1992-01-01), Campbell et al.
patent: 5591964 (1997-01-01), Poole

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