JPH05292030A - Optical transmitter/receiver - Google Patents

Abstract

PURPOSE:To prevent a fault generated due to working temperature from occurring by operating an optical transmitter/receiver only when temperature reaches a value within a prescribed temperature range. CONSTITUTION:Temperature sensitive switches SW1, SW2 deformed by anbient temperature are inserted into a Vcc line and a Vee line in series, respectively. The switches SW1, SW2 function as a power source switch, and the switches are turned off in environment other than the range of working temperature, which disables the operation of the optical transmitter/receiver itself. The temperature sensitive switch SW1 turned off at the lower limit of a temperature condition is inserted to the Vcc line, and the temperature sensitive switch SW2 turned off at the lower limit of the temperature condition is inserted to the Vee line. Also, the temperature condition can be recognized by adhering a seal whose color changes depending on the ambient temperature on the specific part of the optical transmitten/receiver, thereby, it is possible to judge whether the fault is the one due to the ambient temperature or the one due to another cause.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transceiver used in an optical communication system.

[0002]

2. Description of the Related Art Conventionally known optical transceivers include
Because there is a limit to the operating temperature of the parts used for it,
The usable temperature range is specified. However, some users may not be aware of it and are using it in an environment outside the temperature range.

[0003]

As described above, in the conventionally known optical transmitter / receiver, there is a possibility that the optical transmitter / receiver may be used as it is beyond the usable temperature range. In that case, if it is used as it is, malfunction may occur. There is a risk of breakdown.

Therefore, it is an object of the present invention to provide an optical transceiver configured to operate only within a predetermined temperature range.

[0005]

In order to achieve this object, the present invention provides a power line and an optical signal processing circuit between the power line and the optical signal processing circuit.
A temperature-sensitive switch using a bimetal is inserted in series and power is supplied to the optical signal processing circuit only within a predetermined temperature range.

[0006]

According to the structure of the present invention, when the optical transmitter / receiver is present in the atmosphere exceeding the allowable temperature range, the temperature sensitive switch is opened and the power supply to the circuit body is cut off.

[0007]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 shows a power supply connecting portion in an embodiment of the present invention. In the figure, reference numeral 2 denotes a signal processing circuit main body incorporated in the optical transceiver. Also, V _CC and V
_ee is a power supply line, and SW1 and SW2 are temperature sensitive switches (bimetal switches) peculiar to this embodiment.

Here, the bimetal is one in which strip-shaped thin plates of two kinds of metals having different coefficients of thermal expansion are welded into one plate, and the difference in the degree of bending due to temperature is utilized. Amber and bronze are used. Is often used, and the difference between the linear expansion coefficients α ₁ and α ₂ is α ₂ −α ₁ = 1.8 × 10 ⁻⁵ / de
It is g. In addition, a third metal having an intermediate expansion coefficient may be inserted in the middle to smooth the change of the curve (Rikagaku Dictionary: Iwanami Shoten).

As shown in FIG. 1, the temperature-sensitive switch SW1, which is deformed by the ambient temperature, into the V _CC line and the V _ee line
SW2 is inserted in series. This SW1, SW2
Plays a role of a power switch, and turns off the switch in an environment other than the operating temperature range so that the optical transceiver itself does not operate. A temperature-sensitive switch SW1 that turns off at the lower limit of the temperature condition is inserted in the V _cc line, and V
_A temperature-sensitive switch SW2, which turns off at the lower limit of temperature conditions, is inserted in the _ee line.

FIG. 2 is a mounting view of the inside of a conventionally known optical transceiver, and FIG. 3 shows a state in which this embodiment shown in FIG. 2 and FIG. 1 are combined.

As is clear from a comparison between FIG. 3 (embodiment) and FIG. 2 (conventional example), 10, 15, 16, 1 in which the substrate and the lead frame were connected using wires in FIG.
9, 23 are changed to bimetals (shapes change depending on temperature) in FIG.

At this time, as shown in FIG. 4, the lead frame side is fixed, but the board side is brought into contact with or separated from the board when the shape changes due to temperature. So that they stop moving.

After that, when performing the molding process, it is necessary to secure a space so that the bimetal can move.

Further, by sticking a seal or the like whose color changes depending on the ambient (atmosphere) temperature to a specific portion of the optical transmitter / receiver, the temperature condition can be understood so that the ambient temperature can be understood when it does not operate. It should be possible to predict whether the function of the present embodiment has worked depending on the temperature or a failure mode different from that.

[0016]

As described above, according to the present invention, when the operating temperature (ambient temperature) exceeds the permissible range, the power supply voltage is not applied, and the operation is not automatically performed. It is possible to prevent a failure caused by the cause.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a mounting diagram of a conventionally known optical transceiver.

FIG. 3 is a mounting diagram of an optical transceiver to which the present invention is applied.

FIG. 4 is a diagram showing an operating state of a photosensitive switch using bimetal.

[Explanation of symbols]

2 Signal processing circuit SW1, SW2 Temperature-sensitive switch using bimetal V _cc , V _ee Power line R _x optical receiver T _x optical transmitter

Claims (1)

[Claims] 1. A power supply line and an optical signal processing circuit,
An optical transmitter / receiver characterized in that a temperature-sensitive switch using a bimetal is inserted in series and power is supplied to the optical signal processing circuit only within a predetermined temperature range.