Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-03-21
1995-01-24
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359156, 359173, 359124, H04B 1000
Patent
active
053846516
ABSTRACT:
The system includes two transmitters (T1, T2) and two receivers (R1, R2). One transmitter (T1) may include a wavelength tunable laser, sending an FSK optical signal (OS1) which has a constant intensity. In a first receiver (R1) this FSK optical signal (OS1) is transformed into an IM signal (OS1') by an optical pass band filter. This IM signal (OS1') is then detected by a first direct detection receiver (DM). In a second direct detection receiver (R2) the FSK optical signal (OS1) is not detected, since it has constant intensity. A second transmitter (T2) includes a Fabry Perot laser or a LED with a broad linewidth, sending an IM optical signal (OS2). This IM optical signal (OS2) is detected by the second direct detection receiver (R2). It is not detected by the first direct detection receiver (DM), because it is strongly attenuated when passing through the narrow bandpass optical filter (TM) before being applied to the first direct detection receiver. This system is especially advantageous in bidirectional optical transmission systems, due to its inherent insensitivity to reflections.
REFERENCES:
patent: 5020153 (1991-05-01), Choa et al.
patent: 5214641 (1993-05-01), Chen et al.
8 Gbit/s FSK Modulation of DFB Lasers with Optical Demodulation by A. R. Chraplyvy et al, Electronics Letters, 2nd Mar. 1989, vol. 25, No. 5, pp. 319-321.
Fiber Loop Reflectors by David B. Mortimore, Journal of Lightwave Technology, vol. 6, No. 7, Jul. 1988, pp. 1217-1224.
Heterodyne Transmission of a 560 Mbit/s Optical Signal by Means of Polarisation Shift Keying by E. Dietrich, Electronics Letters, 9th Apr. 1987, vol. 23, No. 8, pp. 421-422.
Mestdagh Denis J. G.
Sierens Christiaan H. J.
Van de Voorde Ingrid Z. B.
Van der Plas Gert
Verbiest Willem J. A.
ALCATEL N.V.
Bacares Rafael
Chilcot Jr. Richard E.
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