Transmitter for optically transmitting analog electric signals,

Details Transmitter for optically transmitting analog electric signals, Transmitter for optically transmitting analog electric signals,

1997-09-04

2000-05-30

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359180, 359158, H04B 1004

Patent

active

060697229

ABSTRACT:
In a digital optical transmission system, such as a passive optical distribution network, analog electric signals, e.g., video signals, are to be optically transmitted in such a way that they can be recovered in a receiver (BONT) in a simple manner. To accomplish this, the transmitter of the transmission system includes a delta-sigma modulator (MOD) and an electrical-to-optical transducer (EO). The delta-sigma modulator (MOD) digitizes the analog electric signals using the delta-sigma modulation method. The electrical-to-optical transducer (EO) then converts the digitized signals to optical signals, which are transmitted over optical fibers to a plurality of receivers (BONT). To recover the analog electric signals, each receiver (BONT) requires only one optical-to-electrical transducer (OE) and one passive electric filter (FIL). The filter (FIL) is a passive low-pass filter in one case and a passive bandpass filter in another. Appropriate selection of the sampling frequency for the delta-sigma modulation and utilization of image frequencies for transmission eliminate the need for frequency translators in the receivers (BONT).

REFERENCES:
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patent: 5659314 (1997-08-01), Tokura et al.
patent: 5768315 (1998-06-01), Mittel et al.
"DIAMANT--Ein digitales optisches Fernsehverteilnetz", H. Zielinski et al, Telekom Praxis, Feb. 1993, pp. 38-45.
"A 1.28-GHZ Sigma-Delta Modulator for Video A/D Conversion", M. Erbar et al, IEEE Transactions on Consumer Electronics, vol. 42, No. 3, Aug. 1996, pp. 357-361.
Unger, H., "Optische Nachrichtentechnik", Elitera-Verlag, Berlin, 1976, pp. 118, 119.

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