JPS59168421A - Optical setting and resetting flip-flop circuit - Google Patents

Abstract

PURPOSE:To obtain an optical setting and resetting FF circuit which sets and resets the quantity of projection light between two values by a light signal by using an optical bistable element and an optical inverter. CONSTITUTION:The projection light 203 of the optical bistable element 102 holds to the quantity P0 or P1 of light. When a set light signal 200 which has the predetermined quantity Ph of light is applied to an end surface 100 while the projection light 203 of the element 102 has the quantity P0 of light, the projection light 203 of the element 102 has the quantity P1 of light and holds it thereafter as long as bias light Pb is applied to an incidence terminal. The optical inverter 105 when applied with a light signal with the prescribed quantity Pb of light at its incidence terminal generates no projection light. Consequently, the projection light 203 of the element 102 returns to the quantity P0 of light and holds it thereafter as long as the bias light Pb is applied to the incidence terminal. Namely, the optical bistable element 102 has bistable characteristics as characteristics of the quantity of projection light to the quantity of incident light.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical set-reset seven lip-flop circuit with optically refined memory.

Conventionally, current mode logic, which uses a current switch as a basic block, has been known as a device that performs logical operations on electrical coefficients at high speed.
Research is progressing on ultra-high-speed logical operation devices using T and Josephson coupling elements.

However, there are limits to the use of electrical signals for high-speed digital information processing of large amounts of two-dimensional data such as image information in terms of calculation speed, power consumption, etc.

Therefore, it is desired to realize an optical logic operation device that can digitally process optical signals that are compatible with high-speed, two-dimensional parallel information processing. An optical information storage device that can write fIf information is essential.

An object of the present invention is to provide an optical set/reset flip-flop circuit Kf that can set and reset the light value of the output light L between two values using an optical signal.

According to the present invention, the optical bistable element has an input end connected to the set optical signal input terminal and an output end connected to the optical signal output terminal for 7Js, and an optical bistable element whose input end is connected to the reset optical signal input terminal. An optical set/reset flip-flop circuit is obtained, which is characterized in that it is constructed by optical inverters having respective output ends.

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

According to FIG. 1, a first embodiment of the invention has one end face 1.
00, an optical bistable element 102 whose input end is in contact with the other end surface of the optical waveguide 101, and an optical waveguide 104 into which a reset optical signal is input into one end surface 103. An optical inverter 105 whose input end is in contact with the other end face of the optical waveguide 104, and an optical bistable element 1 whose one end face is connected to the output end of the optical inverter element 105.
Optical waveguide 1 whose end face of external force is in contact with the incident path of 02, respectively.
06 and 'Fj'i Nd Optical waveguide 108 where the output light of the bistable element 102 is guided to the output end face 1.07 of the single force end face at the output end of the Nd optical bistable element 102. including.

'fA' 4, 2 is a diagram showing a time nayat for dimming the first real I color V+ of the present study shown in FIG. 1.

In FIG. 2, an optical signal number form 200 represents a set optical signal incident on the end face 100, an optical signal waveform 201 represents a reset optical signal incident on the end face 103, and an optical number 1A waveform 202 represents the output light of the optical inverter 105. , optical signal waveforms 203 indicate the output light from the optical bistable element 102, respectively.

According to FIG. 2, the embodiment of the present invention shown in FIG.
is added, so that the output light 203 of the optical bistable element 102 becomes P. or P, either light b
) is held at δ. Output light 2 of optical bistable element 102
03 or light amount P. A predetermined light on the end face 100 when holding the! , Ph′, 2
00 is added, the output light 20 of the optical bistable element 102
3 shows the lights s and PI, and the bias light PB is placed at the input end after the s.
Keep light i4:PI as long as is added. Here, the optical inverter 10511-1 has the property that when a 1st wave of light having a predetermined light 44Q is applied to the input end, the 6π of the output light becomes zero, and therefore the end face When the reset optical pulse signal 201 having the light intensity Ph is input to J03, the output light intensity of the optical inverter 105 becomes zero while the human control beam becomes Pb. As a result, the output light 203 of the optical bistable element 102 has a light amount P.

After returning to the state, the light valve -P is maintained as long as the bar "Ame light Pb" is added to the incident end. The amount of light P(+11 t increases, and conversely P
When in is decreased from Pt, the output light amount Pout exhibits a hysteresis characteristic such that it decreases to Pc'T0:'M, < Ill. When the bias light of party I)b is added to the input end, the output light amount poul /:, ['. and the two stable points of Pl.

The set optical signal 200 shown in FIG.
is the light hLPt-Pb in the hysteresis characteristics shown in Figure 3.
It is set to 41Δ above.

FIGS. 4(a) and 4(b) are diagrams showing examples of optical bistable elements that can be used in the present invention.

Figure 4(a) shows an optical bistable device using a directional coupling type optical nullifier, and by feeding back a part of the output light of the optical switch to the applied voltage of the optical switch, the device shown in Figure 3 can be used. Output light characteristics can be obtained.

In FIG. 4(a), IO is a directional coupling type optical switch, 11 is a semi-transmissive mirror, 12 is a photodetector, and 13 is a voltage amplifier.For details of the operating principle, refer to the document I.

EE, Journal of Quantum Electronics, IEEE Journal
of Quantum Electronics,
vol, QE-14) pages 577 to 580. FIG. 4(b) shows a bistable semiconductor laser. By providing a part of the resonator of a semiconductor laser with an oJ saturation part, for example, a part where no current is injected, it is possible to create a part with bistable characteristics in the injection current vs. optical output characteristic. By appropriately selecting flow 1, the human output light characteristics shown in FIG. 3 can be changed.

Details of the above-mentioned bistable semiconductor laser are described in the electronics letter, volume 17, page 741, and the collection of lecture papers at the 1957 National Conference of Denshitsu Hakugakken Optical and Radio Division (Volume 2), page 272.

FIG. S shows an example of the optical inverter 102 in this embodiment. As shown in FIG. 5, the optical inverter 102 shown in FIG. A semiconductor laser 501 into which coherent input light 505 is incident in the transverse direction
It can be configured by

When the input light 505 is not incident, the population inversion inside the semiconductor laser 501 is uniform, and the semiconductor chick 501 directs the output light in the direction where the stimulated emission due to the resonance of the Febry, fy/Pep co-retractor is maximum. 504 is being issued.

Coherent input light 505 is output to the plane of the junction 50
Intensity Pin of this input light 505 incident in the direction crossing 4
On the shelf 7 where Pout is greater than the intensity Pout of the output light 504, photons due to population inversion within the semiconductor laser 501 are stimulated and emitted one more strongly in the direction of the input light 505 than in the direction of the output light 504. As a result, the emission of the output light 504 stops when the population inversion contributing to the emission in the direction of output -)'i2504 becomes similar.

FIG. 6 is a diagram showing the relationship between Pin and pout in FIG. 5 for explaining the operation of the optical inverter. In FIG. 6, when Pin is 0, Pb is output, and when a light amount Ph greater than the threshold light -11Pth is input, Pout becomes 0. Therefore, the state where Pin is the light amount Ph is expressed as the input logic level “l(”, Pjn
is the light amount Ph at the input logic level "L", Po
1 The state where t is the light amount Pb is the output logic level "H",
The state where Pout has a light amount of 0 is the output logic level "L"
By making it compatible with ``, an inverter in which the input logic level and the output logic level are inverted can be avoided.

Regarding the phenomenon of oscillation stop due to the injection light of the semiconductor laser in Fig. 5, please refer to the document Soviet Physics Semiconductor.
microconductors), Volume 3, No. 3, September 1969, page 314.

FIG. 7 is a diagram showing a second embodiment 14 of the invention.

In FIG. 7, the same numbers as in FIG. 1 indicate the same components as in FIG. 1. Unlike the first embodiment shown in FIG. 1, in the second embodiment shown in FIG. The optical signal that is drawn is guided to the input end of the optical bistable element 102 through the four optical wave paths 701 to the optical circuit 700ζ (thus, the merged optical signal 4z).

As described above, according to the present invention, there is provided a set/reset flip-flop circuit that can set and reset the amount of emitted light by one optical signal at the same time.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the first embodiment of the present invention, Fig. 2 is a time chart for explaining the operation of the embodiment of Fig. 1, and Fig. 3 is an optical twin shown in Fig. 1. FIG. 4 is a diagram showing the characteristics of the stable element 102, FIG. 4 is a diagram showing a specific example of the optical bistable element 102 that is smaller than FIG. 1, and FIG. 5 is a diagram showing an example of the optical inverter 105 shown in FIG. 1. 6 is a diagram showing the characteristics of the optical impark 105 shown in FIG. 5, and FIG. 7 is a diagram showing the characteristics of the optical impark 105 shown in FIG.
It is a figure showing an example of. In the figure, 101, 104, 106, 108 and 701 are optical waveguides, 102 is an optical bistable element, and 105
indicate an optical inverter, respectively. Figure 1 Figure 2 Bullet 3 Ward i-n Light 4 Figure 0 ((1) Cb) Figure 5 out Figure 6 in

Claims (1)

[Claims] An optical bistable element has its input end led to the set optical signal input terminal and its output end led to the optical signal output terminal, its input end led to the reset optical signal input terminal, and its output end led to the optical bistable element. The optical set-reset 7 lip-flop circuit is constructed by an inverted original inverter.