JPS63299512A - Switch for high-speed digital signal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to switches for switching high speed broadband information signals.

BACKGROUND OF THE INVENTION Hitherto, no switches for high-speed, wide-band, high-speed optical signals have been put to practical use, and there are only two-circuit switches on a laboratory scale. Furthermore, it is difficult for switches using electronic circuits to operate on the GHz order, and therefore the advantages of optical high-speed broadband digital signals are not fully utilized.

Problems to be Solved by the Invention Conventionally, there are mechanical or electronic switches for switching information signals. Mechanical switches had problems in terms of response speed. Further, electronic switches are mainly used in a frequency band of several 100 MHz due to the stray capacitance of electronic circuits, and therefore have slow transmission speeds and are difficult to withstand electrical surges. - Although switches using a force tip have many advantages such as a wide frequency band and good noise resistance, they have some drawbacks in terms of the configuration of the changeover switch section and the processing of high-speed optical signals. , it has not yet become practical.

The present invention provides a high-speed broadband switch that can switch such high-speed broadband optical information signals without losing high speed using an electrical switch.

Means to Solve the Problem The present invention takes advantage of the high-speed, wide-band characteristics of optical signals, includes a plurality of identification pulses used for switch operation in the digital pulse train that serves as the signal, and uses the combination of the plurality of pulses to It is a switch that performs a switch operation and distributes a signal consisting of a digital pulse train that includes the identification pulse.○ It has an identification pulse at an arbitrary time and position (predetermined) in the operating digital pulse train, There is a separate electrical switch circuit having a detector for detecting this identification pulse, and when the signal form of the identification pulse and the signal form of the detector match, this detector causes the electrical switch circuit to is "open" and the digital pulse train passes through this switch.

Example An embodiment of the present invention will be described below.

FIG. 1 shows an example of an optical information digital pulse train. In the figure, a indicates an identification pulse signal, which in this embodiment is composed of a 2-bit pulse signal. Further, b indicates a pulse train of an information signal, which in this embodiment is composed of an 8-bit pulse signal. In this embodiment, the signal is expressed in the form of a normally used RZ signal. FIG. 2 shows the configuration of the switch. Now, suppose that the optical information digital pulse train shown in FIG. 1 is input to the switch shown in FIG. 2 from the leftmost person. The optical pulse signal is converted by the optical-to-electrical conversion circuit 1 into a pulse train of electrical signals. The electric pulse signal at this time is exactly the same as that in FIG. The output signal of the optical-to-electrical conversion circuit 1 enters a detection circuit 2 having a discrimination pulse detector, and the detection circuit 2 identifies the discrimination pulse signal a in FIG. 1, and distinguishes between the discrimination pulse form and the pulse form of the detection circuit. As a result, the switch circuit 3 is operated to guide the signal to the branch to which the pulse train should be distributed, and the buffer amplifier 7 (or 4, 5, .
6). The signal accumulated in the buffer 7 amplifier 7 is input to the signal discriminator 11 (or any of 8, 9, 10), discriminated, and taken out as the output 15 (or any of 12, 13, 14). . At this time, identification was performed using logic gate elements and the like.

A high-speed response switch with such a configuration allows the switch to process digital pulse signals in parallel, even in low-speed signal processing circuits that were conventionally unable to process digital pulse signals that were input continuously at high speed without sacrificing high-speed performance. Now you can
Furthermore, by adding a latch function to the buffer 7 amplifier, there are great advantages such as high-speed processing.

Note that when the switching operation of the switch circuit 3 is slow, it is also possible to provide a gap between portions a and b of the pulse train in FIG.

This high-speed switching mechanism can be applied to path cables within computers or between computers, and can also be used as high-speed parallel processing path cables. That is, it has a switch function capable of high-speed real-time processing.

The identification pulses in Figure 1 are 2 pulses in the example, but 1 pulse or 3 or more pulses may be used, but as a result of experiments, high-speed response is better and the circuit is more stable. I got the operation. Further, although the identification pulse may be placed at an appropriate position in the pulse train, it is necessary to adjust the timing with the detection circuit 2 or the typing such as switching the pulse train next to the pulse train containing the identification pulse.

Effects of the Invention As described above, the present invention has an extremely large effect in that high-speed signal processing is possible, and is industrially valuable.

[Brief explanation of the drawing]

FIG. 1 is a waveform diagram showing an example of a pulse train of a high-speed optical information signal in an embodiment of the present invention, and FIG. 2 is a block circuit diagram showing a switch for high-speed digital signals according to an embodiment of the present invention. 1... Optical-electrical conversion circuit, 2... Identification pulse detection circuit, 3... Switch circuit, 4 to 7
...Buffer amplifier, 8-11...Discrimination circuit, 12-15...Output terminal.

Claims (1)

[Claims] A detection means for providing at least two pulse signals for identification in the digital pulse train and comparing the signal form of the identification pulse signal with a separately determined signal form; A switch for high-speed digital signals, characterized in that it is provided with switch means for distributing digital pulse trains according to pulses.