JPS59167105A - Integrated circuit - Google Patents

Abstract

PURPOSE:To constitute optical parts, which have the amplifying function of an optical signal, with one integrated circuit by forming photodetectors, amplifier circuits, a driving circuit, and a light emitting device on one semiconductor chip. CONSTITUTION:Photodetectors 10 and 40 and amplifier circuits 20 and 30 are formed as one body on one semiconductor chip. When a receiving signal due to light is inputted to the photodetector 10, the light is converted to an electrical signal by the photodetector 10 and is supplied to the amplifier circuit 20. The amplifier circuit 20 amplifies the inputted receiving signal and supplies it to a driving circuit 30. The driving circuit 30 converts the signal, which is supplied from the amplifier circuit 20, to a current which can drive a light emitting device 40 and supplies it to the light emitting device 40. The light emitting device 40 emits light in accordance with the supplied current and outputs the light as an optical signal to the external.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field and Background Art] The present invention relates to an integrated circuit that functions as an optical signal amplifier in an optical communication system or the like.

Optical components used in optical communication systems, etc.
A device that is compact and efficiently transmits and receives signals, amplifies signals, etc. is desired.

However, conventional optical component circuits that amplify optical signals include integrated circuits that combine a light-receiving element that receives light and an amplifier circuit that amplifies the output signal from the light-receiving element into one package; A device generally consists of an integrated circuit for driving an amplified signal of Ta. Therefore, there is a drawback that there is a certain limit to making the optical signal amplifier as an optical component compact as an integrated circuit.

[Disclosure of the invention]

The present invention was made in view of the drawbacks of the prior art, and includes a light receiving element that receives light from the outside, an amplifier circuit that amplifies the signal from the light receiving element, and a drive that drives the amplified signal in the amplifier circuit. By forming on the same semiconductor chip a drive circuit for output and a light-emitting element that emits light to the outside according to the signal driven by this drive circuit, it is possible to generate optical signals with − number of integrated circuits. Since it can function as an optical signal amplifier that receives light, amplifies it, and outputs it as an optical signal, it is an integrated circuit that can be made compact as an optical component and is effective for technological development such as optical communication systems. 100% disclosure.

[Explanation of Examples]

Next, one embodiment of the present invention will be described based on the drawings.

- In the equivalent circuit of the integrated circuit of the embodiment shown in the drawing, l
0 is a light receiving element, 20 is an amplifier circuit for amplifying the output of this light receiving element 10, 30 is a drive circuit for driving a signal from the amplifier circuit 20, and 40 is a drive signal from the drive circuit 30 to the outside. It is a light emitting element that emits light. If these elements 10, 40 and circuits 20, 30 are integrally input to the light receiving element 10 on a single semiconductor chip (not shown), then light will be transmitted to the light receiving element 10.
The signal is converted into an electrical signal and supplied to the amplifier circuit 2o. The amplifier circuit 2o amplifies the input received signal and supplies it to the drive circuit 3o. The drive circuit 30 converts the signal supplied by the amplifier circuit 2o into a current that can drive the light emitting element 4o, and supplies the current to the light emitting element 40. The light emitting element 4o emits a large amount of light according to the supplied if current, and outputs it to the outside as an optical signal. It can thus be seen that the input optical signal is amplified and output as an optical signal.

〔Effect of the invention〕

As described above, according to the present invention, the light receiving element, the amplifier circuit,
Since the drive circuit and the light-emitting element are formed on one semiconductor chip, an optical component having an optical signal amplification function can be constructed in one integrated circuit. In addition, if it is possible to amplify optical signals with -1 integrated circuits, optical components can be made more compact, making them easier to use in optical communication systems, etc., and making it possible to apply light wave technology to many fields. It has the following effects.

[Brief explanation of the drawing]

The drawing shows an equivalent circuit of one embodiment of the integrated circuit of the present invention. lO... Light receiving element 20... Amplification circuit 30
... Drive circuit 40 ... Light emitting device applicant
NEC

Claims (1)

[Claims] A light receiving element that receives light from the outside, an amplifier circuit that amplifies the signal from this light receiving element, a drive circuit that drives the signal amplified in this amplifier circuit, and a signal driven by this drive circuit. An integrated circuit characterized in that a light emitting element that emits light to the outside is formed on the same semiconductor chip.