Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-03-04
1998-12-01
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359176, H04B 1016
Patent
active
058447067
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The instant invention relates to an optical communication-transmitting method for transmitting at least one useful signal with a high bit rate over an optical waveguide with at least one transmitting station containing a transmitter for transmitting at least one additional signal with a low bit rate, and with at least one intermediate repeater having an optical amplifier and an optical receiver for receiving the additional signal and a transmitter for transmitting a further additional signal derived from it and to an intermediate repeater with an optical line input for useful signals with a high bit rate and for an additional signal with a low bit rate in a time slot, an optical line output for the useful signals with the high bit rate and for a further additional signal with a low bit rate in another time slot, an optical amplifier for the signals and with an one optical receiver for the additional signal and transmitter for the further additional signal of a low bit rate.
An optical communication-transmitting system is known from EP 440 276 A2, wherein a useful signal with a high bit rate, for example several hundred Mbits/s, and an additional signal with a lower bit rate, for example less than 300 kbits/s, are transmitted. The additional signal is transmitted at a wave length which is different from the one at which the useful signal is transmitted. Only the useful signal is amplified in an intermediate repeater by means of an optical amplifier, the additional signal is uncoupled from the fiber upstream of the optical amplifier by means of a wavelength-division multiplexer, is opto-electrically converted, processed and optically coupled back into the fiber downstream of the fiber amplifier. Such an intermediate repeater requires a relatively large technical outlay.
A further communication-transmitting system is known from EP 445 364 A2, in which signals of different wavelength are transmitted via an optical fiber. Here, too, one signal is amplified by means of an optical amplifier, while the other signals are shunted around the optical amplifier via wavelength couplers and a bypass line.
Optical communication-transmitting systems are known from EP 572 890 A1 and DE 42 12 603 A1, in which signals with a high bit rate are transmitted by means of the time-division multiplex method.
SUMMARY OF THE INVENTION
It is the object of the invention to provide an optical communication-transmitting method and an intermediate repeater for it, which can be realized with the smallest possible technical outlay.
In the operation of an optical communication-transmitting system containing intermediate repeaters, an additional signal besides the useful signal is required as a rule, for example for monitoring and locating purposes or as a service signal, for example for service telephones. The useful signal (NS) is used for transmitting the useful information and is a signal of a relatively high bit rate. In contrast thereto, the additional signal (ZS) as a rule is a signal of a relatively low bit rate. During optical transmission of both signals it is necessary to transmit the useful signal (NS) by means of a narrow-band optical carrier signal, because otherwise dispersion effects of the optical waveguide limit the range of the signal. It is generated as a rule by a laser transmitter. In contrast thereto, the optical bandwidth of the optical carrier signal used for the transmission of the additional signal (ZS) can be of a wider bandwidth because of the low bit rate to be transmitted. It can be generated, for example, by a luminescence diode (light-emitting diode) or a super-luminescence diode. Both optical carrier signals are transmitted via the same optical waveguide which, during opposite direction operation, respectively applies for each direction of transmission.
According to the invention a time-division multiplex system with a frame and a number of time slots is used for the transmission of the additional signal (ZS). In this case (at least) n time slots are utilized over a path with n
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Kohn Ulrich
Scheuing Ernst-Ulrich
Tischer Friedrich-Christian
Bacares Rafael
Robert & Bosch GmbH
Striker Michael J.
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