JPS63194432A - Self-diagnosing device for optical repeater - Google Patents

Abstract

PURPOSE:To perform the self-diagnosis of a light transmission part and a light reception part, by comparing an input electrical signal with a signal in which an optical output signal is converted to an electrical signal in the diagnosis of the light transmission part, and comparing the input electrical signal with the signal in which an optical input signal is converted to the electrical signal in the diagnosis of the light reception part. CONSTITUTION:In a self-diagnosing part 3, an input signal SIN is selected at a selection circuit 13 in the diagnosis of the light transmission part 1, and it is converted from a bipolar signal to a unipolar signal at a circuit 14, and is inputted to a comparison and collation circuit 19. The optical output signal SOUT taken out from the monitoring PD of an LD module 4 as monitoring light is inputted, and after amplifying it to a logic level at an amplifier circuit 15, is selected at a selection circuit 17, and after being converted from an CMI signal to the unipolar signal at a circuit 18, is inputted to the comparison and collation circuit 19. The above mentioned two signals are compared and collated, and when no coincidence is obtained, it is decided that a fault is generated in the light transmission part 1. In the diagnosis of the light reception part 2, the diagnosis is performed similarly as stated above by using the optical input signal RIN and the output signal ROUT.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a monitoring device for an optical terminal station relay device and an optical intermediate stitching device, and particularly for diagnosing an optical terminal station relay device and an optical intermediate relay device. The present invention relates to a self-diagnosis device for an optical repeater suitable for.

[Conventional technology]

Conventional optical terminal relay equipment or optical intermediate stitching equipment monitoring equipment uses, for example, the “
Facility-33-7J, pages 102 to 109, Yamashita et al.
As shown in ``Medium Capacity Optical Fiber Cable Transmission System'', equipment was monitored by monitoring input and output interruptions, frame synchronization loss, etc. of optical repeating equipment, and alarms were issued to the line. However, it did not have a self-diagnosis function for diagnosing the optical repeater.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the self-diagnosis function of the optical terminal relay device or the optical intermediate stitching device, and it is not possible to quickly identify the location of the device failure by distinguishing whether the device failure is on the transmitting side, receiving side, or line. There was a problem in which proper maintenance could not be carried out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a self-diagnosis device for an optical relay device that can identify a faulty part of the device and perform prompt maintenance.

[Means for solving problems]

The above purpose is to collect input electrical signals and optical output signals of the optical transmitter of the optical terminal relay device or optical intermediate stitching device, signals extracted by a photodetector as monitor light of the laser diode, and optical input signals of the optical receiver. A selection circuit selects the signal extracted from the output of the photodetector and the output electrical signal, and the selected signals are compared and verified to determine whether they match or not.If they do not match, a device alarm is generated and optical transmission is performed. This is achieved by a self-diagnosis device for an optical repeater, which is configured by providing a self-diagnosis section consisting of a comparison circuit for diagnosing the optical receiver and a comparison and verification circuit for diagnosing the optical receiver.

[Effect]

In the self-diagnosis device for the optical repeater described above, in diagnosing the optical transmitter, the monitor photodiode (used to stabilize the optical output of the laser diode), which is used to stabilize the optical output of the input electrical signal and the optical output signal, is used to diagnose the optical transmitter.
Compare and match the signal converted to an electrical signal using PD) etc.
On the other hand, in diagnosing the optical receiver, the optical input signal is converted into an electrical signal using an avalanche diode (APD), etc., and the output electrical signal is compared with the output electrical signal.
Self-diagnosis of the optical transmitter and the optical receiver can be performed by determining a mismatch and generating a device alarm if there is a mismatch.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing an embodiment of a self-diagnosis device for an optical repeater according to the present invention. In FIG. 1, the present optical repeater comprises an optical transmitter 1, an optical receiver 2, and a self-diagnosis section 3. The optical transmitter 1 includes a bipolar/unipolar conversion circuit (B/U) 4 and a unipolar/CMI conversion circuit (
U/C) 5, drive circuit (DRV) 6, LD (laser diode) module 7, and output stabilization circuit (APC).
) 8, inputs an input signal from a transmission input terminal SIN, and sends out an optical output signal from a transmission output terminal 5OUT.

The optical receiver 2 includes an APD (avalanche photodiode) module x, a reception image M (RCV) 10, and a CMI/
It is composed of a unipolar conversion circuit (C/U) 11 and a unipolar/bipolar conversion circuit (U/B) 12, and receives an optical input signal from the reception input terminal RIN and sends out an output signal from the reception output terminal ROUT. .

The self-diagnosis section 3 of this optical repeater is a selection circuit (SEL) 13
Bipolar/unipolar conversion circuit (B/U) 14
g, m1llti4 circuit (AMP) 15 g, receiving circuit (RCV) 16, selection circuit (SEL) 17, CM
I/unipolar conversion circuit (C/U) 18, comparison verification circuit (CMP) 19, and bias detection circuit (BI)
AS DET) 20, and inputs the input signal of the optical transmitter 10, the monitor light of the LD module 7, the output signal of the optical receiver 2, and the output signal of the APD module 9,
The optical transmitter 1 and the optical receiver 2 are diagnosed.

In the configuration shown in FIG. 1, an input electrical signal input from the transmission input terminal SIN in the optical transmitter 1 is converted from a bipolar signal to a unipolar signal in the bipolar/unipolar conversion circuit 4, and then converted into a unipolar signal in the unipolar/CMI conversion circuit 5. This CMI signal is used to drive the LD module 7 in a drive circuit and send out an optical output signal from the transmission output terminal 5OUT. Here, the output stabilization circuit (automatic power/power control circuit) 8 controls the drive circuit 6 using the monitor light taken out from the monitor FD (photodiode) (photodetector) of the LD module 7 to output an optical output signal. Stabilize. The original input signal input from the reception input terminal RIN in the optical receiver 2 is sent to the APD module (photodetector) 9.
The electrical signal is converted into an electrical signal by the receiving circuit IO, and then converted into a logic level signal by the CMI/unipolar conversion circuit 11.
After the CMI signal is converted into a unipolar signal in the unipolar/bipolar conversion circuit 12, the unipolar signal is converted into a bipolar signal, and the output electric signal is sent out from the reception output terminal ROUT.

In the self-diagnosis section 3 in FIG. 1, in diagnosing the optical transmitter 1, the selection circuit 13 selects the input signal of the transmission input terminal SIN, and the bipolar/unipolar conversion circuit 14 converts the bipolar signal into a unipolar signal. , is input to the comparison and verification circuit 19. The optical output signal of one transmission output terminal 5OUT is extracted as a monitor light from the monitor PD of the I and D modinir 4, and this is input to the amplifier circuit 15.
After amplifying it to a logic level, the selection circuit 17 selects it, and the CMI/unipolar conversion circuit 18 converts the CMI signal into a unipolar signal, which is then input to the comparison and verification circuit 19 . From this, the comparison and verification circuit 19 compares and collates the input signal of the optical transmitter 10 and the electrical signal obtained by converting the optical output signal to determine whether they match or not.If they do not match, it is determined that there is a failure in the optical transmitter 1. Diagnose and generate equipment alarm. In addition, in diagnosing the optical receiver 2, the optical input signal of the reception input terminal RIN is converted into an electrical signal by the APD module 9, which is converted into a logic level signal by the receiver circuit 16, and then selected by the selection circuit 17. 'Unipolar conversion circuit 1
After converting the CMI signal into a unipolar signal in step 8, the signal is input to the comparison and verification circuit 19.

A selection circuit 13 selects the output signal of one reception output terminal ROUT.
, the bipolar/unipolar conversion circuit 14 converts the bipolar signal into a unipolar signal, and then inputs the signal to the comparison/verification circuit 19 . As a result, the comparison and verification circuit 19 compares and collates the output signal and the electrical signal obtained by converting the optical input signal of the optical receiver 2 to determine whether they match or not. If they do not match, it is determined that there is a failure in the optical receiver 2. Diagnose and generate equipment alarm.

Note that in this diagnosis of the optical receiver 2, the optical input signal of the reception input terminal RIN is transmitted to the bias detection circuit 20 of the APD module 9.
Detects input disconnection and monitors input level.

According to this embodiment, when diagnosing the optical transmitter, input/output verification is performed using the input signal and a signal obtained by converting the electrical signal of the FD output for monitoring the optical output signal to a logic level, and when diagnosing the optical receiver, By performing input/output verification using a signal obtained by converting an input signal to a logic level electrical signal and an output signal,
Self-diagnosis of optical terminal relay equipment, etc. becomes possible.

〔Effect of the invention〕

According to the present invention, it is possible to self-diagnose the optical terminal relay device and the optical terminal relay device, and the faulty part of the device can be identified, so that prompt maintenance can be implemented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a self-diagnosis device for an optical repeater according to the present invention. 1... Optical transmitter, 2... Optical receiver, 3...
・Self-diagnosis section, 4...Bipolar/, :L Nivola conversion circuit (B/U
), 5... Unipolar/CMI conversion circuit (U/C)
, 6... Drive circuit (DRV), 7... LD module, 8... Output stabilization circuit (APC), 9... APD module, 10... Receiving circuit (RC
V), 11...CM I/unipolar conversion circuit (C
/U), 12...unipolar/bipolar conversion circuit (U/B), 13...selection circuit (SEL), 14...bipolar/unipolar conversion circuit (B/U)
), 15... Amplification circuit (AMP), 16... Receiving circuit (RCV'), 17... Selection circuit (SEL), 18... CMI/unipolar conversion circuit (C/U
), 19... Comparison and verification circuit. Ba

Claims (1)

[Claims] 1. The input electric signal of the optical transmitter of the optical repeater and the optical output signal of the optical transmitter are used as monitor light of the laser diode, and the electric signal and the optical input signal of the optical receiver are extracted by the photodetector. A selection circuit selects the extracted electrical signal and the output electrical signal of the optical receiver, and compares and checks the selected signals to determine whether they match or not, and if there is a discrepancy, generates a device alarm and transmits the optical signal. A self-diagnosis device for an optical repeater, which comprises a comparison circuit for diagnosing an optical receiver and a comparison circuit for diagnosing an optical receiver.