Optical transmission system

Details Optical transmission system Optical transmission system

H - Electricity

04

J

H04J 14/00 (2006.01) H04B 10/24 (2006.01)

Patent

CA 2086049

- 11 - I. VAN DE VOORDE-D. MESTDAGH- G. VAN DER PLAS-C. SIERENS W.VERBIEST 2-7-5-5-9 ABSTRACT OPTICAL TRANSMISSION SYSTEM The system includes two transmitters (T1, T2) and two receivers (R1, RZ). One transmitter (T1) includes 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 (OS2) 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 for reflections.

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