JP2002135207A - Optical output stopping system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical output stopping system in which an optical output signal from an optical module can be stopped surely, when it is not required, moreover without using expensive optical modules of special specifications. SOLUTION: A CMI data signal 15 from a CMI encoding circuit 2, an MFLOSS signal 16 from a multi-frame detection signal 3, an ACT signal 17 from a control signal detection circuit 4 and an interrupt detection signal 18 from a clock interrupt detection circuit 5 are inputted to an AND circuit 7, and the output therefrom is used for stopping the optical output signal 19 from an optical module 6, when it is not required, thus reducing power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical output stop system, and more particularly to an optical output stop system for reducing the power consumption of an optical transmission device by stopping an output signal from an optical module used in an optical transmission device or the like when it is not needed. About.

[0002]

2. Description of the Related Art An optical transmission device or an optical communication device has various advantages as compared with telecommunications, and is rapidly spreading in many fields. Conventional technologies related to such optical communication include:
For example, it is disclosed in "Laser cut-off method" of JP-A-62-245826, "optical transmission apparatus" of JP-A-8-18611, and "optical transmission apparatus" of JP-A-9-29746. .

In a conventional optical transmission device, an optical module itself has a function of stopping optical output. That is, a control terminal for controlling the optical output is provided in the optical module, and a control signal is input from the outside to stop the optical output signal. However, an optical module having the above-described functions is particularly expensive, and a commonly used inexpensive optical module does not have a function of controlling such an optical output. In a system accommodating one line in one package, since the package is mounted and mounted when the device is used, the control of the light output stop by the control signal is not performed. Further, when the output data signal is suppressed for the lower order device when the clock signal from the upper order device is abnormal, conventionally, the H (high) level or the L level is set in the circuit preceding the CMI encoding circuit.
(Low) level.

FIG. 2 is a block diagram showing a conventional output signal suppressing method. This output signal suppression method is based on CMI (Cod
e Mark Inversion) It is composed of an encoding circuit 2, an output suppression circuit 8 at the preceding stage, a clock loss detection circuit 5, and an optical module 6. The clock signal 12 is input to the clock disconnection detection circuit 5, and outputs a disconnection detection signal to the output suppression circuit 8. On the other hand, the input data signal 1
1 is input, and a data signal 21 is output to the CMI encoding circuit 2. The CMI encoding circuit 2 outputs a CMI data signal 15 to the optical module 6, and the optical module 6 outputs an optical output signal 19.

FIG. 3 is an explanatory diagram of the CMI encoding circuit 2 in FIG. 3A is a state transition diagram, FIG. 3B is an input / output truth table, and FIG. 3C is a CMI encoding circuit 2.
3 is a block diagram showing an input Dn and outputs Yan and Ybn of FIG. Since such a CMI encoding circuit 2 is well known to those skilled in the art, a detailed description thereof will be omitted here.

[0006]

However, since the optical module used in the above-described output signal suppression system or optical output stop system is an expensive product with special specifications, it cannot be easily used in a general-purpose device. Can not. Further, in order to suppress the output data signal to the lower order device when the clock signal from the upper order device is abnormal, the H level (“1”) or the L level (“0”) is set in the circuit preceding the CMI encoding circuit 2. I have to. In this method, when (1) is fixed by the coding conversion rule of the CMI coding circuit 2 (“1, 1”, “0,
0). On the other hand, when ("0") is fixed, ("0,
1 "," 0, 1 "... That is, there is a problem that the optical output from the optical module 6 cannot be completely stopped.

[0007]

SUMMARY OF THE INVENTION The main object of the present invention is to stop the optical output from an optical module by a remote control according to a control signal from a higher-level device, and to easily stop the optical output when the line is not used to consume. To reduce power. In addition, by stopping the optical output when the control signal and the clock signal received from the higher-level device are abnormal, the power consumption when the line cannot be used due to a failure is reduced. Provides guaranteeing eye protection.

[0008]

According to the optical output stop method of the present invention, a CMI encoding circuit for receiving a data signal from a higher-level device and changing it to a CMI data signal, and outputting an optical output signal upon receiving the CMI data signal. An optical output stop method for an optical transmission device that includes an optical module and stops an optical output signal from the optical module when not needed, and outputs an ACT signal that controls an optical output in response to a control signal from a higher-level device. A signal detection circuit, a clock disconnection detection circuit that receives a clock signal from a host device and outputs a disconnection detection signal of the clock signal, and controls the optical module by performing a logical operation on the ACT signal and the disconnection detection signal together with a CMI data signal. A logic element.

Further, according to a preferred embodiment of the optical output stop method of the present invention, a multi-frame detecting circuit is provided which receives the above-mentioned control signal and outputs an MFLOSS signal when the multi-frame is out of synchronization. input. A separating circuit is provided for separating a multiplexed input data signal from the host device into a data signal and a control signal. In addition, as the above-described logic element, an AND element or an OR element is used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to clarify the above and other objects, features and advantages, the structure and operation of a preferred embodiment of an optical output stop system according to the present invention will be described in detail with reference to the accompanying drawings. explain.

FIG. 1 is a block diagram showing the configuration of a preferred embodiment of an optical output stop system according to the present invention. Note that, for convenience of explanation, the same reference numerals are used for the components corresponding to the components of the above-described conventional system. This optical output stop method includes a separation circuit 1, a CMI encoding circuit 2, a multi-frame detection circuit 3, a control signal detection circuit 4, a clock disconnection detection circuit 5, an AND element (AND gate) 7, and an optical module 6. You.

Each of the separating circuit 1 and the clock disconnection detecting circuit 5 receives a serial input data signal 1
1 and a clock signal 12 are input. Separation circuit 1
Converts the input data signal 11 into a data signal 13
And the control signal 14. The CMI encoding circuit 2
The data signal 13 is subjected to CMI encoding conversion to a CMI data signal 15. The multi-frame detection circuit 3 controls the control signal 1
4 to detect a multi-frame. Further, the multi-frame detection circuit 3 outputs the MFLOSS signal 16 at L level when the multi-frame is out of synchronization. The control signal detection circuit 4 detects an ACT signal 17 which is a control signal of an optical output from the control signal 14 input from the multi-frame detection circuit 3. The clock loss detection circuit 5 receives the input clock signal 1
2 input disconnection detection. In addition, the clock disconnection detection circuit 5
Is the L level disconnection detection signal 1 when the input clock is disconnected.
8 is output.

On the other hand, the AND element 7 suppresses the output of the CMI data signal 15 with the MFLOSS signal 16, the ACT signal 17, and the disconnection detection signal 18. The optical module 6 converts the electric signal output from the AND element 7 into an optical signal and outputs an optical output signal 19.

The operation of the preferred embodiment of the optical output stop method according to the present invention shown in FIG. 1 will be described below. First, the operation of the optical output stop method when the control signal 14 and the clock signal 12 are normal will be described.

The H level of the ACT signal 17 detected by the control signal detection circuit 4 is detected during control during operation. On the other hand, the L level is output during the output stop control. At this time, the MFLOSS signal 16 and the disconnection detection signal 18 are both at the H level. CMI data signal 15, MF
Since the LOSS signal 16, the ACT signal 17, and the disconnection detection signal 18 are all input to the AND element 7, during the output stop control, regardless of the logic of the CMI data signal 15,
Is at L level. Therefore, the light output signal 19 from the optical module 6 is in a light output stop state (a state in which no light is emitted).

When the control signal 14 is out of synchronization of the multiplexed multi-frame, the multi-frame detection circuit 3 outputs the MFLOSS signal 16 at L level. When the clock signal 12 input from the host device is disconnected, the clock disconnection detection circuit 5 outputs an L level disconnection detection signal 18. Therefore, when the multi-frame is out of synchronization and the input of the clock signal 12 is interrupted, the CM
Regardless of the logic of the I data signal 15, the output of the AND element 7 is at the L level. Therefore, also in this case, the light output signal 19 from the optical module 6 is in a light output stop state (a state in which no light is emitted).

As a result, the optical output signal 19 from the optical module 6 can be stopped by remote control by the control signal 14 from the host device. As a result, the line is not (or not)
At the time of use, the light output signal 19 from the optical module 6 can be stopped simply and reliably, and power consumption can be reduced. In addition, by stopping the optical output when the control signal 14 and the clock signal 12 received from the host device are abnormal, unnecessary power consumption when the line cannot be used due to a failure is reduced. Further, when a failure occurs, it is possible to guarantee the protection of the eyes of the maintenance staff by the laser beam.

Next, another embodiment of the light output stop method according to the present invention will be described. The basic configuration is substantially as in the preferred embodiment described above. However, it is characterized in that the position where the frequency abnormality is detected is changed. In FIG.
CMI data signal 15, MFLOSS signal 16, ACT
Although the signal 17 and the disconnection detection signal 18 are both input to the AND element 7, the output logic of each element may be changed to an OR element. Also, this AND element 7 is shown in FIG.
May be replaced by the output suppressing circuit 8 as shown in FIG.

The configuration and operation of the preferred embodiment of the optical output stop system according to the present invention have been described above in detail. However, it should be noted that such an embodiment is merely an example of the present invention and does not limit the present invention in any way. It will be readily apparent to those skilled in the art that various modifications can be made in accordance with the particular application without departing from the spirit of the invention.

[0020]

As is apparent from the above description, according to the optical output stopping method of the present invention, the following remarkable effects in practical use can be obtained. That is, the optical output signal from the optical module can be stopped remotely by the control signal multiplexed with the received data signal from the host device, and the optical output signal can be easily and reliably output when the line is not used or not used. It is possible to reduce the power consumption by stopping the signal. In addition, by stopping the optical output signal when the control signal and the clock signal received from the host device are abnormal, the power consumption when the line is unavailable due to the failure is reduced, and the maintenance is performed from the laser beam when the failure occurs. It is possible to reliably protect the eyes of maintenance personnel. Furthermore, since the light output stop method of the present invention can be realized by a small-scale circuit, it can be easily added to an existing device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a preferred embodiment of a light output stop method according to the present invention.

FIG. 2 is a block diagram of a conventional output signal suppression method.

FIG. 3 is a CMI (Code Mark Inve) shown in FIGS. 1 and 2;
(A) is an explanatory diagram of an encoding circuit, (A) is a state transition diagram, (B) is a truth table, and (C) is an input / output relationship diagram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 separation circuit 2 CMI encoding circuit 3 multi-frame detection circuit 4 control signal detection circuit 5 clock disconnection detection circuit 6 optical module 7 AND device 8 output suppression circuit 11 input data signal 12 clock signal 13 data signal 14 control signal 15 CMI data Signal 16 MFLOSS signal 17 ACT signal 18 Disconnection detection signal 19 Optical output signal

Claims (5)

[Claims] 1. A CMI receiving a data signal from a host device.
CMI encoding circuit for converting into a data signal and the CM
An optical module for receiving an I data signal and outputting an optical output signal, wherein the optical output stop method of the optical transmission device for stopping the optical output signal from the optical module when not needed; A control signal detection circuit for outputting an ACT signal for controlling an optical output, a clock disconnection detection circuit for receiving a clock signal from the host device and outputting a disconnection detection signal for the clock signal, the ACT signal and the disconnection detection signal And a logic element for controlling the optical module by performing a logical operation with the CMI data signal. 2. The optical device according to claim 1, further comprising: a multi-frame detection circuit for receiving the control signal and outputting a MFLOSS signal when the multi-frame is out of synchronization, and inputting the MFLOSS signal to the logic element. Output stop method. 3. The optical output stop system according to claim 1, further comprising a separation circuit for separating a multiplexed input data signal from said higher-level device into said data signal and said control signal. 4. The optical output stop method according to claim 1, wherein an AND element is used as said logic element. 5. The optical output stop method according to claim 1, wherein an OR element is used as said logic element.