JPS60236273A - Photosemiconductor device - Google Patents

Abstract

PURPOSE:To obtain a high light output with high frequency by connecting an impedance matching circuit for matching with the impedance of a high frequency drive source between the drive source and a photosemiconductor element. CONSTITUTION:An impedance matching circuit 6 has a capacitor and an inductance element 8 connected in series with a photosemiconductor element 1 and a capacitor 9 connected in parallel. The circuit 6 is connected between a high frequency drive source 4 and a photosemiconductor element 1, the impedance of the source 4 is matched to high frequency from the source 4 and contained in the same package as the element 1. The light output from the element 1 does not decrease, and when used for an optical communication, large number of pieces of information can be transmitted with high light output.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention mainly relates to an optical semiconductor device for optical communication,
! The present invention relates to an optical semiconductor device that can obtain efficient optical output using a high-frequency drive source.

[Prior art]

In recent years, optical semiconductor devices such as laser diodes and LEDs are being used in the field of information processing based on single-source communications and multiplexing.

If this optical semiconductor element is modulated at a high frequency and used, it is possible to transmit and process a larger amount of information, which is very effective.

From this point of view, a method as shown in FIG. 1 can be considered as a method of driving all optical semiconductor elements with high frequency. In FIG. 1, (1) is an optical semiconductor element such as a laser diode or an LED, and in this example, a semiconductor laser is used. (21
(31 is the terminal of this optical semiconductor element.

Terminal (3) is grounded. (4) is a high frequency drive source.

(4a) is the impedance of this high frequency drive source, (5)
is the connection between this high frequency drive source (4) and the terminal of the optical semiconductor element (
This is a load resistor connected between 21 and 21.

On the other hand, the equivalent circuit of the optical semiconductor element (1) in the laser oscillation state is as shown in the second factor.

In Figure 2, (1a) is the linear inductance based on the lead electrodes connected to terminal (2) and terminal (3), respectively, and (ib) is the linear inductance between the lead electrode and the chip electrodes that make up the entire optical semiconductor element. (1) is the operating resistance of the chip during laser oscillation operation, and (1d) is the stray capacitance of the package housing the chip.

When the optical semiconductor element (1) is fully driven by the high-frequency drive source 11+ in the device configured in this way, the one-element semiconductor element (1
) power) optical output according to the frequency of the high frequency drive 1111f11? I- occurred, but the ftS output was low.

Therefore, the inventors designed a total frequency change from the frequency drive source fi+ in order to transmit a larger amount of information.
The relationship between the frequency from the high frequency drive source fil and the optical output of the optical semiconductor element (1) as shown in FIG. 3 was obtained.

As can be seen from FIG. 3, when the output from the high frequency drive source fi+ falls into the high frequency range, the optical output of the optical semiconductor element (11) drops rapidly.

This means that the higher the frequency from the high-frequency drive source (1), the higher the frequency at both ends (≧×
This is because the impedance between children and nieces increases.

[Summary of the invention]

This invention has been made in view of the above points, and includes an impedance matching circuit between a high-frequency drive source and an optical semiconductor element, which matches the impedance of the high-frequency drive source with respect to the frequency of the high-frequency drive source. We propose a semiconductor device that can be connected to provide high optical output even at high frequencies.

[Embodiments of the invention]

An embodiment of the present invention will be explained below based on FIG. This is an impedance matching circuit that matches the impedance of the high-frequency drive source (4) for high frequencies from It is composed of a capacitor (7) and an inductance element (8) connected in series, an optical semiconductor element (1), and a capacitor (9) connected in parallel. (l [l is The terminal connected to one electrode of the above (9) capacitor, (11
1 is a terminal (3) of the optical semiconductor element, which is connected to the terminal K.

Both terminals atxu are exposed or protrude outside the package, and serve as terminals for the optical semiconductor device.

In an optical semiconductor device configured in this manner.

Since the high frequency from the high frequency drive source (4) is matched with the impedance of the high frequency drive source (4) by the impedance matching circuit (6)K, the optical output from the optical semiconductor element (11) is There is no decrease in optical output, and a high optical output can be obtained.As a result, when used for 9-optical communication, etc., a large amount of information can be transmitted and processed with high optical output.

Furthermore, since the one-element semiconductor element +11, the impedance matching circuit (6), and the metal circuit are housed within the package, it is sufficient to connect both terminals +1 (111) to the high-frequency drive source (4).

There is no need to provide a special external circuit, and it is easy to use.

FIG. 5 shows another embodiment of the present invention, in which an impedance matching circuit (6) includes a capacitor α2 connected in series with an optical semiconductor element, and capacitance and inductance formed by a distribution constant of P. The matching element a3 has a matching element a3.

This device also provides the same effects as the embodiment shown in FIG. 4 above.

〔Effect of the invention〕

As described above, this invention provides an arrangement between a 1% frequency drive source and an optical semiconductor element, between a high frequency drive source and an optical semiconductor element, and between a 1% frequency drive source and an optical semiconductor element. Since all the impedance matching circuits are connected, it has the full effect of obtaining a high optical output at a high frequency.

Therefore, when the optical semiconductor device of the present invention is used for optical communication or the like, it has the effect of being able to transmit and process gluttonous information with high optical output.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a circuit for fully driving the optical semiconductor element (1);
Figure 2 is a diagram showing the equivalent circuit in the operating state of the optical semiconductor element, Figure 3 is a diagram showing the relationship between the frequency of the high-frequency drive source (4) and the optical output of the optical semiconductor element +11, and Figure 4 is a diagram showing this. FIG. 5 is a diagram showing one embodiment of the invention, and FIG. 5 is a diagram showing another embodiment of the invention. In the figures, (If is an optical semiconductor element, (4) is a high-frequency drive source, and (6) is an impedance matching circuit. The same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa et al. 2 people) No. 11!2I Round number f

Claims (1)

[Claims] +11 An impedance matching circuit is connected between the high-frequency drive source and the optical semiconductor element to match the impedance of the high-frequency drive source to the frequency of the high-frequency drive source. Optical semiconductor device. (2) The optical semiconductor device according to claim 1, wherein the optical semiconductor element and the impedance matching circuit are housed in the same package. (3) The impedance matching circuit includes a capacitor and an inductance element connected in series to the optical semiconductor element, and a capacitor connected in parallel to the optical semiconductor element. 2. The optical semiconductor device according to item 1 or 2. (4) A patent claim characterized in that the impedance matching circuit includes a capacitor connected in series to a one-element semiconductor element, and a matching element having a capacitance and an inductance formed with a desired distribution constant. The optical semiconductor device according to the range 1 or 2.