JPH10224299A - Optical signal output monitor circuit for optical transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an entire system from being affected by a fault by stopping an optical output with terminal equipment itself when abnormal light emitting of the terminal equipment occurs in an optical burst signal transmission system, where a transmission line is configured by an optical branch (1:n). SOLUTION: In a reception part of terminal equipment, an optical signal from a master set is converted into an electric signal by an O/E module 1 to extract reception data. In the case that the master set detects abnormality of the terminal equipment, an optical transmission stop signal to the terminal equipment is included in the received data. In the case that the terminal equipment receives the optical transmission stop signal, transmission of data to the E/O module 4 is stopped, even in the case of stopping the transmission data to the E/O module 4 and in the case that the E/O module itself emits light abnormally and the optical output from the terminal equipment does not stop, the optical output of the E/O module is monitored. When the optical output is not stopped, power supply to the E/O module is stopped to interrupt the optical output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical output monitoring circuit, and more particularly, to an optical signal output monitoring circuit in an optical transmission device for transmitting a burst signal.

[0002]

2. Description of the Related Art A conventional optical signal output monitoring circuit of an optical transmission device will be described.

FIG. 3 is a block diagram showing a configuration of an optical signal output monitoring circuit of a conventional optical transmission device. In FIG. 3, a signal 36 output from a transmission signal generator 31 is received by a laser diode driver 32, and a laser diode 33 is driven to output an optical signal 37 to the outside. at the same time,
The optical signal 37 from the laser diode 33 is monitored by an optical output monitoring photodiode 34. When an output abnormality of the optical signal 37 is detected, the optical output abnormality detecting section 35 outputs an optical output abnormality signal 38.

When the output of the optical signal in the optical transmission apparatus is abnormal, the driving of the laser diode 33 is stopped using the optical output abnormality signal 38 to stop the light emission, or the abnormal light emission is displayed.

On the other hand, in the optical burst signal transmission system shown in FIG. 2 in which a transmission path is formed by optical branching (1: n), the devices 23 and 24 on the terminal side for transmitting the burst signal transmit the master device 21 at a predetermined timing. A burst signal is transmitted to For this reason, in such an optical burst signal transmission system, when light is transmitted at a timing other than that transmitted by a terminal device, a normal transmission data from another terminal device is normally transmitted.
May be obstructed.

For example, when the master device 21 detects an abnormality in the terminal device, the master device transmits an optical transmission stop signal in the transmission data to the abnormal terminal device, and receives the optical transmission stop signal from the master device. The device stops optical transmission under the control of the parent device. However, even if an optical transmission stop signal is received from the master device and the optical transmission is stopped electrically in the terminal device, the problem arises that the optical output does not stop if the E / O module emits abnormal light. .

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical burst signal transmission system in which a transmission path is constituted by optical branches (1: n) in view of the above-mentioned problems of the prior art. In preparation for abnormal light emission from the terminal device that has received the transmission stop signal, monitor the optical output of the E / O module in the terminal device. If there is abnormal light emission, the terminal device stops the optical output itself, and the failure affects the entire system. The goal is to prevent

[0008]

In order to solve the above-mentioned conventional problems, an optical signal output monitoring circuit according to the present invention comprises a transmission line composed of an optical branch between a parent device and a plurality of terminal devices. In an optical burst signal transmission system, an O / E module that receives an optical signal, converts the signal into an electric signal, and sends out received data, detects an optical transmission stop signal from the received data from the O / E module, and performs optical transmission. An optical transmission stop signal detection unit that sends a stop signal, a transmission selection unit that receives the optical transmission stop signal and transmission burst data, and stops transmission data when the optical transmission signal stop signal is received, and the transmission data And an E / O module for inputting an E / O module power supply output and outputting a monitor signal and an optical signal, and receiving the optical transmission stop signal, receiving the monitor signal and the optical transmission stop signal. A monitor unit for outputting a power control signal when the optical output is detected by a monitor signal, and a power supply control signal and a power supply input as inputs. When an abnormality is detected by the monitor unit, the E / O module A power supply unit for outputting power for stopping power output is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an O / E module for receiving an optical signal 11 transmitted from a master device (not shown) and performing optical-to-electrical conversion, and outputs received data 12 as an electrical signal. Reference numeral 2 denotes an optical transmission stop signal detecting unit for detecting an optical transmission stop signal from the master device included in the received data 12 and transmitting an optical transmission stop signal 20. Reference numeral 3 denotes a detected optical transmission stop signal 20 and transmission burst data 13. Is a transmission selection unit that stops the transmission data 14 when the optical transmission signal stop signal 20 is received with the input as the input. Reference numeral 4 denotes an E / O module that receives the transmission data 14 and the power output 18 for the E / O module and outputs an optical signal 19 converted from light to light and a monitor signal 15.

5 is a monitor signal 15 and an optical transmission stop signal 2
0 is an input, a monitor unit that outputs a power control signal 16 when an optical output 19 is detected by the monitor signal 15 when an optical transmission stop signal 20 is received from the parent device, and 6 is a power supply unit. A power supply unit that receives a control signal 16 and a power input 17 as inputs and stops the E / O module power output 18 when abnormal light emission of the optical output 19 is detected by the monitor unit 5.

A feature of the present invention is that the E / O module 4 outputs an optical signal 19 to the outside of the optical transmission stop signal detector 2 for detecting the optical transmission stop signal 20 from the master device to the terminal device. When the E / O module 4 does not stop emitting light (abnormal light emission), the monitor unit 5 that monitors whether or not the light emission has occurred is output a control signal 16. The power supply unit 6 receiving the control signal 16 from the monitor unit 5 performs E / O
The power output 18 to the module 4 is stopped, the power supply to the E / O module 4 is cut off, and light emission is stopped.

The operation of the embodiment of the present invention will be described.

In FIG. 1, an O / E module 1 receives an optical signal 11 from a parent device, converts it into electricity, and outputs received data 12. When the parent device detects an abnormality in any of the terminal devices, the parent device puts an optical transmission stop signal in the optical signal 11 and sequentially transmits the signal to the terminal device. The optical transmission stop signal detector 2 detects the optical signal stop signal 2 based on the received data 12.
When 0 is detected, the detection output is sent to the transmission selector 3 and the monitor 5.

The transmission selector 3 uses the input transmission burst data 13 as transmission data 14 at normal times as E / O
The E / O module 4 sends the optical signal 1
9 and send it to the parent device.

The optical transmission stop signal 20 from the parent device is detected by the optical signal stop signal detection unit 2, and when the transmission selection unit 3 receives the optical transmission stop signal 20, the transmission selection unit 3 transmits the E / O signal.
The transmission data 14 for the module 4 is stopped.

At the same time, the monitor 5
When the optical transmission stop signal 20 is received from the parent device,
The optical signal 19 of the / O module 4 is monitored by the monitor signal 15. When the E / O module 4 does not stop the light when receiving the light transmission stop signal 20 (abnormal light emission), the monitor unit 5 sends the power supply control signal 16 to the power supply unit 6. Normally, the power supply unit 6 sets the power input 17 to E / O
Although the power is supplied to the E / O module 4 as the module power output 18, the power output 18 for the E / O module is stopped when the power control signal 16 is received.

Thus, if there is an optical transmission stop signal 20 from the master device and there is still abnormal light emission from the E / O module 4, the light emission can be stopped.

[0019]

As described above, according to the present invention, when the optical burst signal transmission device cannot be controlled by the optical output stop control from the master device, the optical supply is stopped by stopping the power supply to the O / E module. Is also stopped, which has the effect of preventing an optical signal from another terminal device from being affected.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical signal output monitoring circuit of an optical transmission device according to an embodiment.

FIG. 2 is a block diagram showing a configuration of an optical burst signal transmission system in which a transmission path is formed by optical branches (1: n).

FIG. 3 is a block diagram showing a configuration of an optical signal output monitoring circuit of a conventional optical transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 O / E module 2 Optical transmission stop signal detection part 3 Transmission selection part 4 E / O module 5 Monitor part 6 Power supply part 11 Optical signal 12 Reception data 13 Transmission burst data 14 Transmission data 15 Monitor signal 16 Power supply control signal 17 Power supply Input 18 Power supply output for E / O module 19 Optical signal 20 Optical transmission stop signal 21 Parent device 22 Optical branch 23 Terminal device 1 24 Terminal device n 31 Transmission signal generator 32 Laser diode driver 33 Laser diode 34 Photo for optical output monitor Diode 35 Optical output abnormality detector 36 Transmit signal 37 Optical signal 38 Optical output alarm signal

Claims (2)

[Claims] In an optical burst signal transmission system in which a transmission path is formed by optical branching between a parent device and a plurality of terminal devices, an O / O that receives an optical signal, converts the optical signal into an electric signal, and sends out received data. An E module, an optical transmission stop signal detecting unit for detecting an optical transmission stop signal from the received data from the O / E module, and transmitting an optical transmission stop signal, and receiving the optical transmission stop signal and the transmission burst data as inputs, A transmission selection unit that stops transmission data when an optical transmission signal stop signal is received; an E / O module that receives the transmission data and a power output for the E / O module and outputs a monitor signal and an optical signal; The monitor signal, the optical transmission stop signal is input, and a monitor unit that outputs a power control signal when the optical output is detected by the monitor signal when the optical transmission stop signal is received. , A power supply control signal and a power supply input, and when an abnormality is detected by the monitor unit, the E / O
An optical signal output monitoring circuit, comprising: a power supply unit for outputting an output for stopping a power output for a module. 2. The optical device according to claim 1, wherein the optical transmission stop signal is superimposed on an optical signal to the terminal device when the parent device detects an abnormality of the terminal device. Signal output monitoring circuit.