Code word recognition unit and use thereof

Details Code word recognition unit and use thereof Code word recognition unit and use thereof

1991-12-10

1995-01-17

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359126, 359139, H04B 1014, H04J 1408

Patent

active

053830458

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention is directed to a code word recognition unit for an access node of optical transmission equipment. It is further directed to the application of such equipment.
2. Description of the Prior Art
Transmission equipment and diverse types of information transmission via transmission lines are known in general. Recently, optical transmission lines have become increasingly important for various reasons. In addition to the optical point-to-point connections, complicated network structures with optical lines are also known. For example, in an article entitled "Optical fibres in local area networks", Communications/Communications International, October 1985, pages 19 ff., B. Viklund describes various network structures with glass fiber cables for distribution networks and for networks with connections between diverse subscribers which can be set up individually. In the latter, a ring structure is most favorable. The subscriber stations of an optical transmission line of the aforementioned type are connected to the respective utilized fibers via optoelectrical couplers.
At present, there are components for optical systems, e.g. couplers, switches and modulators, based e.g. on InP semiconductor material, which utilize electro-optical effects in order to influence light. These elements work up to frequencies in the gigahertz range.
The use of address-coded packets for the transmission of information is generally known. Such packets comprise a header and an information part [hereinafter infopart], wherein the header contains all necessary data for the respective packet and the participating devices, e.g. a destination or target address, data concerning the type of packet, monitoring bits, etc. The infopart is available for the useful information to be transmitted.
When receiving information arriving via an optical line, it is unavoidable that at least a part of the light stream carrying the information is used. Further, every receiving subscriber station must be synchronized to the bit clock and to the clock of the passing packet.


SUMMARY OF THE INVENTION

The object of the invention consists in providing transmission equipment which makes do to a great extent without electrical regenerators while utilizing the aforementioned components. In particular, an address recognition unit is to be provided which is simple with respect to construction and operates in an uncomplicated manner.
The solution, according to the invention, makes it possible to provide flexible transmission equipment which has considerable advantages over the comparable, previously known equipment because of its more extensive optical construction. An outstanding immunity to electromagnetic interference, which in turn has a positive influence on the operating speed and sensitivity, should be noted in particular. The address recognition unit works with an integrator which is slow compared to the bit clock of the addresses and the transmission line and by nature has no problematical reactions to distortions and the like. The address recognition unit is accordingly suitable for rapid transmission lines up to clock frequencies of e.g. several gigabits. If the addresses are selected in a suitable manner, they can be easily distinguished from one another.
The invention is described in more detail in the following by way of example with reference to eight diagrams.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of optical transmission equipment;
FIG. 2 is a schematic view of an optical directional coupler on a very enlarged scale;
FIG. 3 is a symbolic depiction of the directional coupler;
FIG. 4 is a block wiring diagram of a first code word recognition unit;
FIG. 5 is a block wiring diagram of a second code word recognition unit;
FIG. 6 shows a set of sixteen code words;
FIG. 7 shows first voltage pulses calculated for the set of FIG. 6;
FIG. 8 shows second voltage pulses calculated for the set of FIG. 6.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a schematic vi

REFERENCES:
patent: 5220448 (1993-06-01), Vogel

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