JP2003295247A - HIGH-SPEED LIGHT exOR ARITHMETIC PROCESSOR - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out optical exOR operation at high speed. <P>SOLUTION: When signal light S1 and S2 are made incident on an optical exOR circuit 1, a XPM type wavelength transformation element, where control light Ss is made incident, an optical signal state of an output light So becomes a state in which the signal light S1 and S2 are exOR operated. When bit synchronized control light Ss is emitted to the signal light S1 using a mode-locked laser 50, decrease of a carrier resulting from saturation of semiconductor light amplifiers 31 and 32 is decreased, a period for recovering the carrier becomes short, and a rising time of the output light So becomes short. As a result, the exOR calculation can be carried out at high speed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to cross phase modulation (X
The present invention relates to a high-speed optical exOR operation device using a PM) type wavelength conversion element and a mode-locked laser so that the optical exOR operation can be executed at high speed.

[0002]

2. Description of the Related Art The bit rate of optical signals has risen from 2.5 Gb / s to 10 with the increase in transmission capacity accompanying the development of IT technology.
Gb / s, and further tends to increase to 40 Gb / s. The problem here is polarization mode dispersion. That is, in general, an optical fiber has a component that travels fast and a component that travels slowly depending on the plane of polarization. Therefore, at the input end of the optical fiber, for example, the polarization components that travel rapidly in the optical pulse (TE polarization component and TM polarization component). Even if the phase of one of the polarization components (which is one of the TE polarization component and the other of the TM polarization components) that propagates slowly matches the phase of the polarization component that propagates slowly in the long optical fiber, The phase is delayed with respect to the polarization component, and at the output end of the optical fiber, the slow-moving polarization component arrives later than the fast-moving polarization component. As a result, at the output end, the waveform of the optical pulse (a composite of the slowly advancing polarization component and the rapidly advancing polarization component) becomes blunt.

The value of this polarization mode dispersion is, for example, about 0.2 × L ^1/2 (ps) to 2 × L ^1/2 (ps) with respect to the fiber length L (Km). That is, in the worst case, assuming an optical fiber of 100 km, polarization mode dispersion of 20 ps occurs.
This value is 2.5 Gb / s (pulse width 400 ps) or 10
Gb / s (pulse width 100 ps) is not a big problem, but 40 Gb / s (pulse width 25 ps) causes fatal waveform deterioration, which causes a significant deterioration in the code error rate.

Therefore, at the output end of the optical fiber, the optical pulse is split into a TE polarization component and a TM polarization component by a polarization splitter, and the phase states of the TE polarization component and the TM polarization component are determined. We came up with the idea of detecting. In this way, TE
An optical exOR (exclusive OR) operation may be performed to detect the phase states of the polarization component and the TM polarization component.

That is, as shown in FIG. 5A, when there is a phase difference between the TE polarization component and the TM polarization component, the optical exO
When the R output is obtained and there is no phase difference between the TE polarization component and the TM polarization component as shown in FIG. 5B, the optical exOR
The output becomes 0. In this way, the optical exOR operation makes it possible to detect the phase state of the polarization component.

Further, in various optical signal inspection circuits and optical processing circuits, an optical exOR circuit for performing an optical exOR operation on two optical signals may be required.

Therefore, the inventor of the present application, in order to perform the optical exOR operation, cross phase modulation (XPM: Cross Phase Modulation).
An optical exOR circuit using a dulation type wavelength conversion element was used.

Here, the optical exO used until now
The R circuit will be described with reference to FIG. Optical ex shown in FIG.
The OR circuit 1 is a cross phase modulator (XPM).
dulation) type wavelength conversion element. In this optical exOR circuit 1, a planar light waveguide (PLC: Planar Lightwave C
A symmetric Mach-Zehnder interferometer circuit 20 constituted by an optical waveguide is formed on the surface of the platform 10 formed by an ircuit).

The symmetrical Mach-Zehnder interferometer circuit 20 is
It has two optical waveguides 21 and 22 for optical interference and optical waveguides 23 and 24 for signal light which form a Mach-Zehnder type optical interference circuit. Then, on the input end side and the output end side, the directional optical couplers (3 dB optical couplers) 25 and 26 are formed by bringing the optical interference optical waveguides 21 and 22 close to each other. Further, the directional optical coupler (3 dB optical coupler) 27 is formed by the optical interference optical waveguide 21 and the signal light optical waveguide 23 being close to each other, and the optical interference optical waveguide 22 and the signal light optical waveguide 24 are formed. A directional optical coupler (3 dB optical coupler) 28 is formed due to the close proximity to each other.

In the Mach-Zehnder type optical interference circuit formed by the optical interference optical waveguides 21 and 22, the arm waveguide portion (existing between the directional optical couplers 25 and 26 of the optical interference optical waveguides 21 and 22) is present. The semiconductor optical amplifiers 31 and 32 are mounted in a portion where the semiconductor optical amplifiers 31 and 32 are interposed. As described above, the semiconductor optical amplifier 3 is used in the Mach-Zehnder interferometer.
The XPM type wavelength conversion element is configured by mounting the components 1 and 32.

Further, the optical exOR circuit 1 is provided with an optical filter 40. The filter 40 has a filter characteristic of passing only the light of the wavelength component (wavelength λs) of the control light Ss. In addition, in FIG. 6, P1 to P
8 is a port.

When the control light Ss, which is a continuous light having a wavelength of λs, is incident on the port P2 of the optical exOR circuit 1, the control light Ss functions as a light directional coupler 25.
And is transmitted through the arm waveguide portions of the optical interference optical waveguides 21 and 22 and is incident on the semiconductor optical amplifiers 31 and 32.

When the signal light S1 having a wavelength of λ1 enters the port P1, the signal light S1 enters the optical interference optical waveguide 21 via the directional optical coupler 27 and enters the semiconductor optical amplifier 31. Then, in the semiconductor optical amplifier 31, the carrier density decreases due to the saturation phenomenon, and the refractive index changes. When the signal light S2 having a wavelength of λ2 is incident on the port P4, the signal light S2 enters the optical interference optical waveguide 22 via the directional optical coupler 28 and is incident on the semiconductor optical amplifier 32. Then, in the semiconductor optical amplifier 32, the carrier density decreases due to the saturation phenomenon, and the refractive index changes.

A directional optical coupler (3 dB optical coupler)
Instead of 25 to 28, a multi-mode interference type 3 dB optical coupler (so-called MMI coupler) may be used.

Next, the operating state of the optical exOR circuit 1 will be described. (1) When the signal lights S1 and S2 are not incident while the control light Ss is incident. At this time, the control light Ss that has passed through the semiconductor optical amplifier 31 and the control light S that has passed through the semiconductor optical amplifier 32.
The phase difference with s is zero, and when both control lights are multiplexed by the directional optical coupler 26 that functions as an optical multiplexer,
Due to the interference effect, the phase state is converted into intensity change. Therefore, the control light Ss whose light intensity is strengthened (the optical signal state becomes “1”) is output from the port P7, and the port P7
In 6, the light intensity is weakened (the optical signal state becomes “0”) and the control light Ss is not output. Therefore, the optical signal state of the output light So from the optical filter 40 is “0”.

(2) When the signal light S1 is incident but the signal light S2 is not incident while the control light Ss is incident. At this time, the phase of the control light Ss that has passed through the semiconductor optical amplifier 31 is changed by the change in the refractive index of the semiconductor optical amplifier 31, and the phase of the control light Ss that has passed through the semiconductor optical amplifier 32 has not changed. , Semiconductor optical amplifier 3
There is a phase difference between the control light Ss that has passed through 1 and the control light Ss that has passed through the semiconductor optical amplifier 32. Therefore, when both control lights are combined by the directional optical coupler 26 that functions as an optical multiplexer, the phase state is converted into an intensity change due to the interference effect. For this reason, the light intensity is weakened at the port P7 (the optical signal state becomes "0") and the control light Ss is not output, and the light intensity is strengthened at the port P6 (the optical signal state is "1"). The control light Ss is output. The waveform of the control light Ss output from the port P6 is an inverted waveform of the waveform of the signal light S1, and its frequency is λs. Therefore, the control light Ss output from the port P6 becomes signal light obtained by wavelength-converting the signal light S1. In this way, the control light S output from the port P6
The s passes through the filter 40 and becomes the output light So, and its optical signal state becomes "1". The signal light S1 having the wavelength λ1 and the signal light S2 having the wavelength λ2 are also output from the port P6, but the signal lights S1 and S2 are cut by the optical filter 40.

(3) When the signal light S1 is not incident but the signal light S2 is incident in the state where the control light Ss is incident. At this time, the control light Ss that has passed through the semiconductor optical amplifier 31 has not changed its phase, and the control light Ss that has passed through the semiconductor optical amplifier 32 has its phase changed due to the change in the refractive index of the semiconductor optical amplifier 32. , Semiconductor optical amplifier 3
There is a phase difference between the control light Ss that has passed through 1 and the control light Ss that has passed through the semiconductor optical amplifier 32. Therefore, when both control lights are combined by the directional optical coupler 26 that functions as an optical multiplexer, the phase state is converted into an intensity change due to the interference effect. For this reason, the light intensity is weakened at the port P7 (the optical signal state becomes "0") and the control light Ss is not output, and the light intensity is strengthened at the port P6 (the optical signal state is "1"). The control light Ss is output. The waveform of the control light Ss output from the port P6 is an inverted waveform of the waveform of the signal light S1, and its frequency is λs. Therefore, the control light Ss output from the port P6 is signal light obtained by wavelength-converting the signal light S2. In this way, the control light S output from the port P6
The s passes through the filter 40 and becomes the output light So, and its optical signal state becomes "1". The signal light S1 having the wavelength λ1 and the signal light S2 having the wavelength λ2 are also output from the port P6, but the signal lights S1 and S2 are cut by the optical filter 40.

(4) When the signal lights S1 and S2 are both incident on the control light Ss. At this time, the control light Ss that has passed through the semiconductor optical amplifier 31 has its phase changed due to the change in the refractive index of the semiconductor optical amplifier 31, and similarly, the control light Ss that has passed through the semiconductor optical amplifier 32 is the semiconductor optical amplifier. The phase is changed by the change in the refractive index of 32.
The phase difference between the control light Ss which has passed through 1 and whose phase has changed and the control light Ss which has passed through the semiconductor optical amplifier 32 and whose phase has changed is zero. Therefore, when both control lights are combined by the directional optical coupler 26 that functions as an optical multiplexer, the phase state is converted into an intensity change due to the interference effect. Therefore, the control light Ss whose light intensity is strengthened (the light signal state is “1”) is output from the port P7, and the light intensity is weakened (the light signal state is “0”) at the port P6. The control light Ss is not output. Therefore, the optical signal state of the output light So from the optical filter 40 is “0”.

After all, according to the optical signal states "1" and "0" of the signal lights S1 and S2, the optical signal states "1" and "0" of the output light So are as shown in FIG. That is, port P
The optical signal state of the output light So in FIG.
This is the state in which 2 is exORed.

Therefore, as shown in FIG. 8, which is a specific example, the output light So has a waveform obtained by exORing the signal lights S1 and S2.

Another conventional example, the optical exOR shown in FIG.
In the circuit 1A, the configuration of the wavelength conversion element itself is the same as that shown in FIG. 6, and in order to eliminate the optical filter, the signal light S
1, S2 and the control light Ss are incident so that the traveling directions thereof are opposite to each other. That is, the signal light S1 enters the port P1, the signal light S2 enters the port P4, and the control light Ss enters the port P6. Therefore, the output light So is output from the port P2. Since the signal lights S1 and S2 are not output from this port P2, an optical filter becomes unnecessary.

Since the configuration and operation of the part other than that the optical filters are not required by making the traveling directions of the signal lights S1 and S2 and the control light Ss opposite to each other are the same as those shown in FIG.
A duplicate description will be omitted.

[0023]

By the way, the conventional optical e
In the xOR circuits 1 and 1A, as shown in FIG.
o has a fast rise (for example, a few ps),
The fall is slow (tens of ps). This is because the nonlinear effect of the semiconductor optical amplifiers 31 and 32 with optical carriers has a very short rise time, but has a long fall time determined by the relaxation time of the carrier after the excitation light (signal light) is cut off. . As described above, since the fall time of the output light So is long, there is a limit to speeding up the optical exOR operation. Therefore, the signal light having a high frequency is transmitted to the optical exO.
There was a limit to the R calculation operation.

The present invention has been made in view of the above-mentioned prior art, and an object thereof is to provide a high-speed optical exOR operation device capable of performing an optical exOR operation at high speed.

[0025]

SUMMARY OF THE INVENTION The structure of the present invention for solving the above problems is such that two optical interference optical waveguides forming an optical interference circuit and signal light are individually incident on the optical interference optical waveguides. And a cross-phase modulation type wavelength conversion element mounted in such a state that a semiconductor optical amplifier is interposed in each of the optical interference optical waveguides. When input, the control light having a frequency and a phase synchronized with the frequency and the phase of the modulated electric signal is incident on the mode-locked laser for sending to the optical interference optical waveguide and the signal optical waveguide. And a modulated electric signal generating means for detecting the frequency and phase of the signal light and for inputting to the mode-locked laser a modulated electric signal having a frequency and phase synchronized with the detected frequency and phase. And butterflies.

The configuration of the present invention includes two optical interference optical waveguides forming an optical interference circuit, and two optical optical waveguides for individually injecting signal light into the optical interference optical waveguides. And a cross-phase modulation type wavelength conversion element which is mounted in a state where a semiconductor optical amplifier is interposed in the optical waveguide for optical interference, and when the modulated electric signal is input, A mode-locked laser that generates a control light having a frequency and a phase synchronized with the frequency and a phase, and detects the frequency and the phase of the signal light that is incident on the signal light optical waveguide. Modulated electrical signal generating means for inputting a modulated electrical signal having a synchronized frequency and phase to the mode-locked laser,
The control light generated from the mode-locked laser is guided to the input port of the optical waveguide for optical interference, and output from the output port of the wavelength conversion element and variable phase delay means for controlling the phase delay amount of the control light to be transmitted. At the same time, the light intensity detecting means for detecting the light intensity of the output light in the optical signal state obtained by performing the optical exOR operation on the two incident signal lights, and the light intensity detected by the light intensity detecting means are the maximum. Therefore, the phase delay amount control means for controlling the phase delay amount by the variable phase delay means is provided.

According to the structure of the present invention, the variable phase delay means changes the continuous light generating laser in which the frequency of the continuous light generated when the element temperature changes and the element temperature of the continuous light generating laser. When the temperature controller, the control light generated from the mode-locked laser, and the continuous light are incident, the wavelength of the control light is converted by the wavelength conversion of the control light, and the wavelength is the continuous light. It is characterized by comprising a wavelength conversion element that outputs conversion control light having a wavelength of light and an optical fiber having wavelength dispersion that transmits the conversion control light output from the wavelength conversion element.

Further, the configuration of the present invention is characterized in that the optical interference circuit is a Mach-Zehnder type optical interference circuit.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

<First Embodiment> FIG. 1 shows a high-speed optical exOR operation device 100 according to a first embodiment of the present invention. This high-speed optical exOR operation device 100 includes an optical exOR circuit 1 which is a cross-phase modulation (XPM) type wavelength conversion element, and a mode-locked laser 5.
0 and the modulated electric signal generator 60.

In the optical exOR circuit 1, the planar optical waveguide (P
A symmetrical Mach-Zehnder type optical interference circuit 20 constituted by an optical waveguide is formed on the surface of the platform 10 formed by an LC (Planar Lightwave Circuit).

The symmetrical Mach-Zehnder interferometer circuit 20 is
It has two optical waveguides 21 and 22 for optical interference and optical waveguides 23 and 24 for signal light which form a Mach-Zehnder type optical interference circuit. Then, on the input end side and the output end side, the directional optical couplers (3 dB optical couplers) 25 and 26 are formed by bringing the optical interference optical waveguides 21 and 22 close to each other. Further, the directional optical coupler (3 dB optical coupler) 27 is formed by the optical interference optical waveguide 21 and the signal light optical waveguide 23 being close to each other, and the optical interference optical waveguide 22 and the signal light optical waveguide 24 are formed. A directional optical coupler (3 dB optical coupler) 28 is formed due to the close proximity to each other.

In the Mach-Zehnder interferometer type optical interferometer formed by the optical interferometers 21 and 22, semiconductor optical amplifiers 31 and 32 are mounted in the arm waveguide portion. By mounting the semiconductor optical amplifiers 31 and 32 in the Mach-Zehnder interferometer, the XPM type wavelength conversion element is constructed.

A directional optical coupler (3 dB optical coupler)
Instead of 25 to 28, a multi-mode interference type 3 dB optical coupler (so-called MMI coupler) may be used.

Further, the optical exOR circuit 1 is provided with an optical filter 40. The filter 40 has a filter characteristic of passing only the light of the wavelength component (wavelength λs) of the control light Ss. In addition, in FIG. 1, P1 to P
8 is a port.

When the modulated electric signal e is input, the mode-locked laser 50 outputs the control light Ss which is a pulsed laser light having a frequency and phase synchronized with the frequency and phase of the modulated electric signal e. This control light Ss is transmitted to the port P
Entered in 2.

The modulated electric signal generator 60 includes an optical coupler 61.
And a signal generator (formed including a light receiver, etc.) 62
It consists of and. The optical coupler 61 branches a part of the signal light S1 input to the port P1 and sends the branched signal light S1 to the signal generator 62. Upon receiving the branched signal light S1, the signal generator 62 performs optical / electrical conversion to obtain an electric signal, and from this electric signal, the frequency and phase are synchronized with the frequency and phase of the signal light S1. Modulated electrical signal e
Is output.

Therefore, the signal light S1 and the modulation synchronization signal e
The frequency and the phase of the control light Ss are synchronized, and the signal light S1 and the control light Ss are bit-synchronized.

With the control light Ss incident on the port P2, the signal light S1 is input to the port P1 and the signal light S2 is input to the port P2.
When incident on 4, as described in the above-mentioned prior art,
The signal state of the output light So output from the optical filter 40 is such that the signal lights S1 and S2 are exORed as shown in FIG.
It will be in the calculated state.

FIG. 2 shows the relationship among the signal light S1, the signal light S2, the control light Ss, and the output light So. Signal light S1,
The pulse width of S2 is, for example, 25 ps, and the pulse width of the control light Ss is, for example, 10 ps.

Since the control light Ss is not continuous light but pulsed light having a narrow pulse width, the output light So has a fast fall and its pulse width is narrow (for example, 10 ps). That is, the output light So has a fast rise and a fast fall. The fall of the output light So becomes faster because the control light Ss is a pulsed light, so that the carrier decrease due to the saturation of the semiconductor optical amplifiers 31 and 32 is small and the time until the carrier recovery is short. is there.

As described above, since the output light So not only rises quickly but also falls quickly, the high-speed optical exOR operation device 100 according to the present embodiment can perform exOR operation at high speed. Therefore, the signal lights S1 and S to be inspected are
Even if the frequency of 2 becomes high, the signal light S of high frequency
The optical exOR operation of 1 and S2 can be performed.

In FIG. 1, without the optical filter 40, the signal light S1 enters the port P1, the signal light S2 enters the port P4, the control light Ss enters the port P6, and the output light So enters the port. Even if the data is output from P2, the exOR operation can be similarly performed at high speed.

<Second Embodiment> FIG. 3 shows a high-speed optical exOR operation device 150 according to a second embodiment of the present invention. The high-speed optical exOR operation device 150 has a configuration in which a variable phase delay unit 70, a light intensity detection unit 80, and a phase delay amount control circuit 90 are further added to the configuration of the high-speed optical exOR operation device 100 shown in FIG. Has become.

The variable phase delay unit 70 changes the amount of phase delay of the control light Ss output from the mode-locked laser 50, a specific example of which will be described later. The light intensity detector 80 includes an optical coupler 81 that branches a part of the output light So,
It is composed of a light receiver 82 that converts the branched output light So into an electric signal e1. The phase delay amount control circuit 90
The value of the electric signal e1 is maximized, that is, the output light S
The phase delay amount in the variable phase delay unit 70 is controlled so that the light intensity of o becomes maximum.

In this embodiment, the mode-locked laser 5 is used.
Although the frequencies of the control light Ss output from 0 and the signal light S1 match, even if the phases of the two are slightly deviated, by controlling the phase delay amount by the variable phase delay unit 70, The phases of the control light Ss output from the variable phase delay unit 70 and entering the port P2 and the signal light S1 exactly match. That is, the signal light S1 and the control light Ss incident on the port P2 can be bit-synchronized more accurately. As a result, the exOR operation can be performed faster and more accurately.

In FIG. 3, without the optical filter 40, the signal light S1 enters the port P1, the signal light S2 enters the port P4, and the control light Ss subjected to the phase delay control.
Is incident on the port P6, the output light So is output from the port P2, and the phase delay amount is controlled so that the output light So is maximized.
Can perform calculations.

<Third Embodiment> FIG. 4 shows a specific example of the variable phase delay unit 70. As shown in the figure, the variable phase delay unit 70 includes a laser 71, a temperature controller 72, an XPM type wavelength conversion element 73, and an optical fiber 7.
It is composed of 4 and.

The laser 71 generates continuous light CW, and when the element temperature changes by 1 ° C., continuous light CW is generated.
Has a characteristic that the wavelength of changes by 0.1 nm. The temperature controller 72 sets the element temperature of the laser 71 to ± 0.5 from the specified temperature based on the control signal from the phase delay amount control circuit 90.
Change by ° C.

The wavelength conversion element 73 has a structure similar to that of the optical exOR circuit 1 shown in FIGS. 1 and 3, and is constituted by providing a semiconductor optical amplifier in the arm waveguide portion of the Mach-Zehnder interferometer. There is. In this wavelength conversion element 73,
When the continuous light CW and the control light Ss are input, the wavelength of the control light Ss is converted, the waveform is the waveform of the control light Ss, and the wavelength is the wavelength of the continuous light CW.
Is output.

The optical fiber 74 has a wavelength dispersion characteristic, for example, a dispersion characteristic of 25 ps / 0.1 nm, and its length is, for example, 2 km.

The conversion control light Ssh output from the wavelength conversion element 73 passes through the optical fiber 74 and is input to the port P2 of the optical exOR circuit 1.

In the variable phase delay unit 70 having such a structure, when the temperature of the element of the laser 71 is changed by 1 ° C. by the temperature controller 72, the wavelength of the continuous light CW, that is, the wavelength of the conversion control light Ssh. Changes by 0.1 nm. When the wavelength of the conversion control light Ssh changes by 0.1 nm, the optical fiber 7
At the end of 4 (ie port P2), a 50 ps phase delay occurs. That is, by changing the element temperature of the laser 71 by ± 0.5 ° C from the specified temperature, the phase delay amount of the conversion control light Ssh reaching the port P2 can be shifted by ± 25 ps.

Since the wavelength conversion element 73 has the same structure as that of the optical exOR circuit 1, the variable phase delay unit 7 is provided.
0 wavelength conversion element 73 and high-speed optical exOR operation device 10
The optical exOR circuit 1 of 0 (150) can be manufactured at the same time on the same substrate, and the manufacturing labor can be reduced.

[0055]

As described above in detail with the embodiments, in the present invention, when a cross-phase modulation type wavelength conversion element is used as an optical exOR circuit, a mode-locked laser is used to obtain signal light. The control light, which is a pulsed light that is bit-synchronized with, is generated. As described above, since the control light that is the pulsed light is used, the fall time of the output light indicating the optical signal state obtained by performing the optical exOR operation on the two signal lights is shortened, and the optical ex is performed at high speed.
It is possible to perform an OR operation.

Furthermore, the phase of the control light generated by the mode-locked laser is adjusted by the variable phase delay means, so that the phases of the signal light and the control light can be matched more accurately, which is accurate and high speed. The optical exOR operation can be performed.

Further, as the variable phase delay means, a laser in which the wavelength of the generated continuous light is changed by controlling the element temperature, a wavelength conversion element, and an optical fiber having wavelength dispersion are used, so that the adjustment can be performed accurately. The variable phase delay means can be simply constructed.

[Brief description of drawings]

FIG. 1 is a high-speed optical exO according to a first embodiment of the present invention.
It is a block diagram which shows an R arithmetic unit.

FIG. 2 is a characteristic diagram showing an optical signal state in the high-speed optical exOR operation device according to the first embodiment.

FIG. 3 is a high-speed optical exO according to a second embodiment of the present invention.
It is a block diagram which shows an R arithmetic unit.

FIG. 4 is a configuration diagram showing a specific example of a variable phase delay unit.

FIG. 5 is an explanatory diagram showing an optical exOR operation.

FIG. 6 is a configuration diagram showing a conventional optical exOR circuit.

FIG. 7 is a characteristic diagram showing an optical signal state of output light in a conventional optical exOR circuit.

FIG. 8 is a characteristic diagram showing an optical signal state in a conventional optical exOR circuit.

FIG. 9 is a configuration diagram showing another example of a conventional optical exOR circuit.

[Explanation of symbols]

1,1A optical exOR circuit (XPM type wavelength conversion element) 10 platforms 20 Symmetric Mach-Zehnder interferometer 21,22 Optical waveguide for optical interference 23, 24 Optical waveguide for signal light 25-28 Directional Optical Coupler 31, 32 Semiconductor optical amplifier 40 optical filter 50 mode-locked laser 60 Modulation electric signal generator 61 Optical coupler 62 signal generator 70 Variable phase delay unit 71 laser 72 Temperature controller 73 Wavelength converter 74 optical fiber 80 Light intensity detector 81 Optical coupler 82 Light receiver 90 Phase delay amount control circuit 100,150 High-speed optical exOR operation device P1 to P8 ports S1, S2 signal light Ss control light So output light Ssh conversion control light e Modulated electrical signal e1 electrical signal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Suzuki             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 2H079 AA06 AA08 AA12 BA01 CA01                       DA16 EA05 EA07 EA08                 2K002 AA01 AB12 AB23 BA02 CA13                       DA08 EA30 EB15 HA16

Claims (4)

[Claims] 1. An optical interferometer comprising two optical waveguides for forming an optical interference circuit, and two optical waveguides for signal light for individually injecting signal light into the optical waveguides for optical interference. When a cross-phase modulation type wavelength conversion element is mounted with a semiconductor optical amplifier interposed in the optical waveguide for optical interference and a modulated electrical signal is input, it is synchronized with the frequency and phase of this modulated electrical signal. The control light having the frequency and the phase, which is controlled by the mode-locked laser, is sent to the optical interference optical waveguide, and the frequency and the phase of the signal light incident on the optical waveguide for the signal light are detected. A high-speed optical exOR operation device comprising: a frequency-synchronized phase and a modulated electric signal generating means for inputting a modulated electric signal in phase with the mode-locked laser. 2. An optical interferometer comprising two optical waveguides for optical interference and two optical waveguides for signal light for individually injecting signal light into the optical waveguides for optical interference. When a cross-phase modulation type wavelength conversion element is mounted with a semiconductor optical amplifier interposed in the optical waveguide for optical interference and a modulated electrical signal is input, it is synchronized with the frequency and phase of this modulated electrical signal. A mode-locked laser that generates control light having the same frequency and phase, and detects the frequency and phase of the signal light incident on the optical waveguide for signal light, and the frequency and phase that are synchronized with the detected frequency and phase. A modulated electric signal generating means for inputting a modulated electric signal to the mode-locked laser and control light generated from the mode-locked laser to an input port of the optical waveguide for optical interference. Together, variable phase delay means for controlling the phase delay amount of the control light to be transmitted, and output from the output port of the wavelength conversion element,
Light intensity detection means for detecting the light intensity of the output light in an optical signal state obtained by performing an optical exOR operation on the two incident signal lights, and the light intensity detected by this light intensity detection means is maximized. , A high-speed optical exOR operation device comprising: a phase delay amount control means for controlling the phase delay amount by the variable phase delay means. 3. The variable phase delay means according to claim 2, wherein the continuous light generation laser changes the frequency of continuous light generated when the element temperature changes, and the element temperature of the continuous light generation laser changes. When the temperature controller, the control light generated from the mode-locked laser, and the continuous light are incident, by converting the wavelength of the control light, the waveform is the waveform of the control light, and the wavelength is the continuous light. A high speed characterized by comprising a wavelength conversion element that outputs conversion control light having a wavelength of light, and an optical fiber having wavelength dispersion that transmits the conversion control light output from the wavelength conversion element. Optical exOR operation device. 4. The high-speed optical exOR operation device according to claim 1, wherein the optical interference circuit is a Mach-Zehnder type optical interference circuit.