WO2012147324A1 - 光周波数変換方法および装置 - Google Patents
光周波数変換方法および装置 Download PDFInfo
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- WO2012147324A1 WO2012147324A1 PCT/JP2012/002769 JP2012002769W WO2012147324A1 WO 2012147324 A1 WO2012147324 A1 WO 2012147324A1 JP 2012002769 W JP2012002769 W JP 2012002769W WO 2012147324 A1 WO2012147324 A1 WO 2012147324A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/02—Frequency-changing of light, e.g. by quantum counters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/212—Mach-Zehnder type
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
- G02F2/006—All-optical wavelength conversion
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/50—Phase-only modulation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/58—Multi-wavelength, e.g. operation of the device at a plurality of wavelengths
Definitions
- the present invention relates to an optical frequency conversion method and apparatus for generating an output lightwave having a desired frequency component from an input lightwave.
- Non-Patent Document 1 a method of shifting the frequency of the input lightwave using an optical single sideband modulator is generally known (for example, Non-Patent Document 1).
- the optical frequency shifter disclosed in Non-Patent Document 1 will be briefly described.
- the optical single sideband modulator 10 comprises two resonant intensity modulators 30-1 and 30- provided respectively on each arm of the main Mach-Zehnder (MZ) waveguide. 2 and the optical phase shifter 32 connected in series to the resonant intensity modulator 30-2, which in turn comprises the Mach-Zehnder waveguide itself.
- a control signal for phase adjustment is input to the input terminal Phase of the optical phase shifter 32.
- the optical frequency shifter 38 includes the optical single sideband modulator 10, the modulation signal oscillator 11, the optical phase shift amount adjustment unit 13, and the phase control unit 14 described above.
- Modulated signal oscillator 11 generates a modulated signal, the modulated signal is directly inputted to the terminal RF A of optical single sideband modulator 10 is input to the terminal RF B via the phase control unit 14.
- the modulation signal is assumed to be a sine wave of a single frequency f.
- Phase control unit 14 is controlled during the modulation signal to be inputted to the terminal RF A and the terminal RF B of optical single sideband modulator 10 to provide a phase difference - [pi] / 2.
- the light phase shift amount adjustment unit 13 performs light so as to give a phase difference ⁇ / 2 between the output lightwave of the resonant light intensity modulator 30-1 and the output lightwave of the resonant light intensity modulator 30-2.
- the phase shifter 32 is controlled.
- the optical frequency shifter 38 having such a configuration, it is assumed that continuous wave laser light of a carrier frequency f 0 having a frequency spectrum shown in FIG. 2A is input.
- the output lightwave of the resonant optical intensity modulator 30-1 of the optical single sideband modulator 10 has the carrier wave and even harmonic components suppressed, and f 0 It has a frequency spectrum including frequency components of + (2 n -1) f (n is an integer).
- the output lightwave of the optical phase shifter 32 in which the output of the resonant optical intensity modulator 30-2 is phase shifted by ⁇ / 2 is f 0 + (2 n-1) f as shown in FIG. 2 (B).
- the phase component of the frequency component of f 0 + (4 n -1) f among them is inverted by ⁇ .
- the formula of the frequency component is indicated by being enclosed by [].
- the frequency component of the output lightwave of the optical phase shifter 32 is the frequency component f 0 + (4n) with respect to the frequency component f 0 + (2n-1) f of the output lightwave of the resonant optical intensity modulator 30-1. -1) Since only the phase of f is inverted by ⁇ , it is written as [f 0 + (2 n -1) f].
- Patent Document 1 proposes an optical frequency converter which does not require such an optical band pass filter.
- the low noise optical frequency converter disclosed in Patent Document 1 includes a phase locked tripler that triples the frequency of the fundamental wave, an amplitude adjuster that adjusts the amplitudes of the fundamental wave and the third harmonic, and a 90-degree hybrid
- this drive system applies a composite wave of the fundamental wave and its third harmonic wave to the terminal RF A of the optical single sideband modulator 10 shown in FIG. applying a - [pi] / 2 only synthesized wave with a phase difference to the terminal RF B.
- the third harmonic is suppressed.
- an optical band pass filter having sharp cutoff characteristics is required. It is very difficult not only to create such an optical band pass filter with high accuracy, but also to maintain the center frequency characteristic of the optical band pass filter, it is necessary to control the temperature with high accuracy.
- the modulation frequency is several GHz, it is necessary to give rise characteristics of the pass band to the optical band pass filter within several GHz, which causes a problem that the control circuit becomes complicated.
- the output lightwave of the optical frequency shifter 38 has a frequency shift as shown in FIG. 3B.
- the first-order frequency component and the harmonic component overlap.
- Such deterioration of the data signal can not be removed even by using an optical band pass filter.
- the target optical frequency is dynamically changed by the modulation signal, it is necessary to dynamically adjust the characteristics of the optical band pass filter according to the change of the frequency of the modulation signal.
- the low noise optical frequency converter disclosed in Patent Document 1 can suppress the third harmonic without using an optical band pass filter.
- the frequency of the fundamental wave that is the modulation signal changes, it is difficult to adjust the amplitude according to the amount of change. That is, although it is necessary to simultaneously adjust the amplitude of the third harmonic in accordance with the amount of change, the amplitude of the third harmonic is not linear with respect to the frequency change, and waveform distortion occurs as the frequency increases. For this reason, it becomes difficult to realize the optical frequency converter by this method as the frequency of the modulation signal becomes higher.
- the present invention has been made in view of the above problems, and its object is to remove components other than the desired harmonic component with high accuracy even if the frequency of the modulation signal is changed, and to obtain the desired frequency component.
- An object of the present invention is to provide an optical frequency conversion method and apparatus capable of easily extracting an output light wave.
- the optical frequency conversion device is an optical frequency conversion device that frequency-converts an input light wave according to a modulation signal using an optical single sideband modulation method to generate an output light wave, and a plurality of optical frequency conversion devices
- a plurality of phase control means for respectively generating individual modulation signals, a plurality of optical single sideband modulation means for modulating the input light wave according to the plurality of individual modulation signals, and a plurality of optical single sideband modulation means
- a plurality of optical phase control means for giving an optical phase difference to the plurality of light waves respectively output from the plurality of optical waves, and a plurality of optical waves output from the plurality of optical phase control means
- a phase difference between the plurality of individual modulation signals and the optical phase difference is set so that a predetermined harmonic component other than a target frequency of the output light wave is removed.
- the optical frequency conversion method is an optical frequency conversion method for converting the frequency of an input light wave according to a modulation signal to generate an output light wave using an optical single sideband modulation method, and a plurality of phase control means
- a plurality of individual modulation signals having different phases are respectively generated from the signal, a plurality of optical single sideband modulation means respectively modulate the input lightwave in accordance with the plurality of individual modulation signals, and a plurality of optical phase control means
- An optical phase difference is given to each of a plurality of light waves respectively output from the optical single sideband modulation means, and a combining means combines a plurality of light waves output from the plurality of optical phase control means to produce the output light wave.
- the phase difference between the plurality of individual modulation signals and the light phase difference may be set such that a predetermined harmonic component other than a target frequency of the output light wave is removed.
- the present invention even if the frequency of the modulation signal is changed, components other than the desired harmonic component can be removed with high accuracy, and the output lightwave of the desired frequency component can be easily extracted.
- FIG. 1A is a block diagram showing the configuration of a general optical single sideband modulator
- FIG. 1B is a block diagram showing a basic configuration example of an optical frequency shifter using it.
- 2 (A) is a frequency spectrum diagram showing frequency components of an input light wave
- FIG. 2 (B) is a frequency spectrum diagram showing frequency components of an output light wave of a resonant light intensity modulator
- FIG. 2 (C) is a co-frequency shifter
- 2D is a frequency spectrum diagram showing frequency components extracted by the filter from the output lightwave
- FIG. 2E is a frequency spectrum of the output lightwave of the low noise light frequency converter. It is a frequency spectrum figure which shows a component.
- FIG. 1A is a frequency spectrum diagram showing frequency components of an input light wave
- FIG. 2 (B) is a frequency spectrum diagram showing frequency components of an output light wave of a resonant light intensity modulator
- FIG. 2 (C) is a co-frequency shifter
- 2D is a frequency spectrum
- FIG. 3A is a frequency spectrum diagram when the input lightwave is a data signal
- FIG. 3B is a frequency spectrum diagram showing frequency components of the output lightwave of the light frequency shifter.
- FIG. 4 is a block diagram showing a generalized configuration of an optical frequency converter according to an embodiment of the present invention.
- FIG. 5 is a block diagram showing a functional configuration of the optical frequency converter according to the first embodiment of the present invention.
- FIG. 6 is a graph showing the relationship between the bias point of the resonant light intensity modulator used in this embodiment and the light intensity of the output light wave.
- FIG. 7 (A) is a frequency spectrum diagram showing frequency components of the input light wave
- FIG. 7 (A) is a frequency spectrum diagram showing frequency components of the input light wave
- FIG. 7 (B) is a frequency spectrum diagram showing frequency components of the output light wave of the resonant light intensity modulator
- FIG. FIG. 7 (D) is a frequency spectrum showing the frequency component of the output lightwave of the present embodiment when the input lightwave is a data signal.
- FIG. FIG. 8 is a block diagram showing a functional configuration of an optical frequency converter according to a second embodiment of the present invention.
- FIG. 9 is a block diagram showing a functional configuration of an optical frequency converter according to a third embodiment of the present invention.
- FIG. 10 is a block diagram showing a functional configuration of the optical harmonics removing unit shown in FIG.
- FIG. 11 is a block diagram showing a functional configuration of an optical frequency converter according to a fourth embodiment of the present invention.
- FIG. 12A is a block diagram showing a functional configuration of the light suppression carrier modulator shown in FIG. 11, and FIG. 12B is a block diagram showing a functional configuration of the optical interferometer shown in FIG.
- FIG. 13 is a block diagram showing a functional configuration of the optical frequency converter according to the fifth embodiment of the present invention.
- FIG. 14 is a block diagram showing a functional configuration of an optical frequency converter according to a sixth embodiment of the present invention.
- the optical frequency converter includes n (n pieces of) light modulation units MOD1 to MODn and n connected to the light modulation units MOD1 to MODn, respectively.
- n optical phase control units 201-1 to 201-n and each optical modulation unit includes the optical single sideband modulator 10 shown in FIG. It comprises the phase control unit 14.
- Terminals RF1 ⁇ RFn of optical modulating sections MOD1 ⁇ MODN is directly connected to the corresponding terminals RF A of optical single sideband modulator 10 is connected to the terminal RF B via the phase control unit 14.
- the modulation signal of the frequency f is an electric signal
- an individual modulation signal is generated by the phase control unit 101-1 which gives the phase difference ⁇ 1-1 to this modulation signal, and is input to the terminal RF1 of the light modulation unit MOD1.
- an individual modulation signal is generated by the phase control unit 101-2 that gives a phase difference ⁇ 1-2 to the modulation signal, and is input to the terminal RF2 of the light modulation unit MOD2.
- the individual modulation signals are respectively transmitted to the terminals RF3 to RFn of the light modulation units MOD3 to MODn through the phase control units 101-3 to 101-n which give the phase differences ⁇ 1-3 to ⁇ 1-n to the modulation signals, respectively. input.
- the phase control unit 14 and the phase control units 101-1 to 101-n of each light modulation unit MOD change the phase control operation point according to the frequency f of the modulation signal from the modulation signal oscillator 11.
- Input lightwave frequency component f 0 is input to an optical single sideband modulator 10 of each of the optical modulating sections MOD1 ⁇ MODN, respective optical output, each optical phase difference of optical single sideband modulator 10 phi 2-
- By combining through the optical phase control units 201-1 to 201-n giving 1 to ⁇ 2-n an output light wave from which a desired harmonic component is removed as described later is generated.
- the phase of the desired harmonic component is inverted by ⁇ by performing phase control on each of the phase control units 101-1 to 101-n and the optical phase control units 201-1 to 201-n.
- Desired harmonic components can be removed by combining the lightwaves obtained by inverting these harmonic components and the lightwaves not inverted.
- the harmonic component to be removed is f 0 + (2m + 1)
- f f
- n is a minimum integer not less than log 2 (m).
- the optical phase control unit 201- (k + 1) is set to - ⁇ / 2 k + 1 .
- n is less than 1, it is possible to remove desired harmonics only with the optical single sideband modulator 10.
- the phase ⁇ 2-2 of the phase control unit 201-2 is set to ⁇ / 4.
- desired harmonics can be removed, an output lightwave of a target frequency component can be obtained only by phase control.
- two or more optical single sideband modulators 10 are arranged in parallel, and the phase control unit controls the phase between the modulation signals that drive these optical single sideband modulators 10.
- the phase control unit controls the phase difference between the output lightwaves of the optical single sideband modulator 10 optically by the optical phase control unit, the output lightwave of the optical single sideband modulator 10 is It is possible to add a phase difference of ⁇ to the harmonic components to be removed out of the included frequency spectrum. Therefore, by combining these output light waves, it is possible to simultaneously remove frequency components whose phases are different by ⁇ due to interference, and it is possible to enhance the accuracy of frequency conversion to a desired accuracy.
- an optical band pass filter is used. It is possible to remove the desired harmonic components easily and precisely without simple control. Further, since unnecessary harmonics can be removed, even if the input light wave is a data signal, it is possible to avoid the deterioration of the output data signal due to the overlapping of the target frequency component and the harmonic component.
- the optical frequency converter according to the present embodiment is applicable not only to optical frequency conversion but also to an optical modulation circuit of an optical transmitter.
- the input light wave is an optical carrier or an optical transmission signal
- the modulation signal is an electrical signal carrying information to be transmitted.
- An optical frequency converter according to a first embodiment of the present invention is configured using two optical single sideband modulators.
- the input lightwave of the carrier frequency f 0 is converted into the output lightwave of the light frequency f 0 + f using the modulation signal of the frequency f, and the third and fifth orders included in the output lightwave
- the harmonic component of the light frequency (f 0 -3f) and the frequency component of the light frequency (f 0 + 5f) will be described as an example.
- the optical frequency converter 68 includes two optical single sideband modulators 10-1 and 10-2, a modulation signal oscillator 11, and an optical phase controller 12. , Two optical phase shift control units 13-1 and 13-2, phase control units 14-1 and 14-2 for giving a phase difference between the terminals RF A and RF B , optical single sideband modulation It comprises a phase control unit 14-3 for giving a modulation signal phase difference between devices, and a desired bias point control unit 16.
- the optical single sideband modulator 10-1 modulates the input lightwave using the modulation signal generated by the modulation signal oscillator 11 as an individual modulation signal, and the optical single sideband modulator 10-2 is modulated by the phase control unit 14-3.
- the input lightwave is modulated based on the individually modulated signal whose signal is phase controlled.
- the optical single sideband modulators 10-1 and 10-2 respectively include resonant optical intensity modulators 30-1 and 30-2 shown in FIG. 1 (A).
- the modulation signal oscillator 11 electrically generates a modulation signal which is the source of the individual modulation signal for driving the optical single sideband modulators 10-1 and 10-2.
- the modulation signal is a single frequency sine wave, and its frequency is f.
- the phase control unit 14-1 controls the phase difference between the modulation signal input to the terminal RF A and the terminal RF B of the optical single sideband modulator 10-1 to be - ⁇ / 2, and performs phase control.
- the unit 14-2 is controlled so that the phase difference between the modulation signal input to the terminal RF A and the terminal RF B of the optical single sideband modulator 10-2 is ⁇ / 2.
- the phase control unit 14-3 based on the individual modulation signal input to the terminal RF A of optical single sideband modulator 10-1, are input to the terminal RF A of optical single sideband modulator 10-2
- the individual modulation signal is controlled to have a phase difference of ⁇ / 4.
- the phase control units 14-1, 14-2 and 14-3 change the phase control operation point according to the frequency f of the modulation signal generated by the modulation signal oscillator 11.
- the optical phase control unit 12 controls the phase difference between the output lightwaves of the two optical single sideband modulators 10-1 and 10-2 to be ⁇ / 4.
- the two optical phase shift amount control units 13-1 and 13-2 are provided in the resonant optical intensity modulators 30-1 and 30-2 respectively provided in the two optical single sideband modulators 10-1 and 10-2.
- the Phase terminals of the optical single sideband modulators 10-1 and 10-2 are controlled so that the phase difference between the output lightwaves is ⁇ / 2.
- the desired bias point control unit 16 is, as shown in FIG. 6, a resonant type light so that the light intensity of the output lightwave of the optical single sideband modulator 10 when the modulation signal is not input becomes minimum (point A). Control the bias points of the intensity modulators 30-1 and 30-2.
- the optical frequency conversion unit 68 having a 2.2 was operated above configuration, a continuous wave laser beam of the carrier frequency f 0 having the frequency spectrum shown in FIG. 7 (A) is assumed to be input.
- the frequency spectrum of the output lightwave of the optical single sideband modulator 10-1 includes frequency components of f 0 + (4n + 1) f (n is an integer) as shown in FIG. 7 (B).
- the frequency spectrum of the output lightwave of the optical single sideband modulator 10-2 that has passed through the optical phase shift control unit 12 has a frequency of f 0 + (4n + 1) f, similarly to the frequency spectrum of FIG. Although the component is included, the phase of the frequency component of f 0 + (8 n -3) f is inverted by ⁇ .
- the light wave that has passed through the light phase shift control unit 12 is [f 0 + (4 n + 1) f].
- the optical frequency converter 68 uses two optical single sideband modulators 10-1 and 10-2 to input without using an optical bandpass filter. It becomes possible to shift the frequency f 0 of the light wave by an arbitrary shift amount. Furthermore, as shown in FIG. 7D, even when the input light wave is a data signal, the output data signal is not deteriorated due to overlapping with other harmonic components.
- the input lightwave of carrier frequency f 0 is converted to the output lightwave of light frequency f 0 -f, and the frequency components of light frequencies (f 0 + 3f) and (f 0 -5f) contained in the output lightwave are simultaneously removed.
- the phase control unit 14-1 adds a phase difference of ⁇ / 2 with the individual modulation signal input to the terminal RF A of the optical single sideband modulator 10-1 as a reference. This can be realized by adding a phase difference of ⁇ / 2 at 14-2 and controlling the phase difference of ⁇ / 4 at the phase control unit 14-3.
- the phase of the optical signal is controlled by using the optical phase control unit 12 and the optical phase shift amount control units 13-1 and 13-2, or the phase control units 14-1, 14-2 and 14- It is also possible to remove other frequency components by controlling the phase of the modulation signal using 3.
- the optical frequency conversion device 68 in this embodiment is realized It is possible.
- An optical frequency converter according to a second embodiment of the present invention is configured using four resonant light intensity modulators.
- the input lightwave of the carrier frequency f 0 is converted into the output lightwave of the light frequency f 0 + f using the modulation signal of the frequency f, and the third and fifth orders included in the output lightwave
- the harmonic component of the light frequency (f 0 -3f) and the frequency component of the light frequency (f 0 + 5f) will be described as an example.
- the optical frequency converter 78 in the optical frequency converter 78 according to the present embodiment, the optical single sideband modulators 10-1 and 10-2 in FIG. Configure using 30-2 and 30-3 and 30-4.
- the optical frequency converter 78 includes the modulation signal oscillator 11, the optical phase control units 12-2, 12-3 and 12-4, and the phase control unit in addition to the resonant optical intensity modulators 30-1 to 30-4. It is comprised from 14-2, 14-3 and 14-4 and the desired bias point control part 16.
- the resonant light intensity modulators 30-1 to 30-4 modulate the input light wave based on the modulation signal generated by the modulation signal oscillator 11. Specifically, although the resonant optical intensity modulator 30-1 modulates the modulation signal from the modulation signal oscillator 11 as an individual modulation signal, the resonant optical intensity modulators 30-2 to 30-4 perform phase control. Modulation is performed by the individual modulation signals to which the phase difference is given by the units 14-2 to 14-4. That is, the phase control unit 14-2 sets the phase difference of the individual modulation signal for driving the resonant light intensity modulator 30-2 to ⁇ with reference to the individual modulation signal for driving the resonance light intensity modulator 30-1.
- the phase control unit 14-3 performs control such that the phase difference of the individual modulation signals for driving the resonant optical intensity modulator 30-3 is ⁇ / 4, and ⁇ 4 is controlled so that the phase difference of the individual modulation signal for driving the resonant light intensity modulator 30-4 is ⁇ / 4. Further, the phase control units 14-1, 14-2 and 14-3 change the phase control operation point according to the modulation signal frequency information from the modulation signal oscillator 11.
- the optical phase control unit 12-2 controls the output lightwave of the resonant light intensity modulator 30-2 to have a phase difference of ⁇ / 2 with reference to the output lightwave of the resonant light intensity modulator 30-1.
- the optical phase control unit 12-3 controls the output lightwave of the resonant optical intensity modulator 30-3 to have a phase difference of - ⁇ / 4, and the optical phase control unit 12-4 performs resonant optical intensity modulation
- the output lightwave of the unit 30-4 is controlled to have a phase difference of ⁇ / 4.
- the desired bias point control unit 16 controls the resonant light intensity modulator 30 so that the light intensities of the output lightwaves of the four resonant light intensity modulators 30-1 to 30-4 when the modulation signal is not input are minimized. Control the bias point from -1 to 30-4. Specifically, point A in FIG. 6 showing the relationship between the bias voltage and the light intensity of the output lightwave of the light intensity modulator is a desired bias point.
- a continuous wave laser beam of the carrier frequency f 0 having the frequency spectrum shown in FIG. 7 (A) is assumed to be input.
- the frequency spectrum thereof is As shown in FIG. 7B, it includes frequency components of f 0 + (4n + 1) f (n is an integer).
- the frequency spectrum includes frequency components of f 0 + (4n + 1) f as in the frequency spectrum of FIG. 7B, but the phase of frequency components of f 0 + (8n-3) f Reverses by ⁇ .
- the output lightwave of the resonant light intensity modulator 30-1 and the output lightwave that has passed through the light phase shift control units 12-2 to 12-4 of the resonant light intensity modulators 30-2 to 30-4 are combined.
- the frequency components whose phases are inverted each other by ⁇ are canceled out, and the frequency spectrum including the frequency component of f 0 + (8n + 1) f as an output light wave of the optical frequency conversion device 78 as shown in FIG. Is obtained. That is, it is possible to obtain an output lightwave in which the carrier frequency f 0 is shifted to the frequency component (f 0 + f).
- the optical frequency converter 78 uses the four resonance type optical intensity modulators 30-1 to 30-4. It is possible to shift the frequency f 0 of the input lightwave by an arbitrary shift amount without using an optical band pass filter. Furthermore, as shown in FIG. 7D, even when the input light wave is a data signal, the output data signal is not deteriorated due to overlapping with other harmonic components.
- the optical frequency converter according to the third embodiment of the present invention is configured using four optical harmonic removal units.
- the input lightwave of carrier frequency f 0 is converted to an output lightwave of light frequency f 0 + f using a modulation signal of frequency f, and the third and fifth orders included in the output lightwave
- the case of simultaneously removing the 7th and 9th harmonic components will be described as an example.
- the optical frequency conversion device 88 includes four optical harmonics removal units 80-1 to 80-4, a modulation signal oscillator 11, and three optical phase optical phase control units 12-1 to 12-3, three phase control units 14-1 to 14-3, and a desired bias point control unit 16.
- the optical harmonic removal unit 80 includes an optical single sideband modulator 10, a desired light phase shift amount control unit 13, and a phase control unit 14.
- the optical harmonics removal units 80-1 to 80-4 modulate the input lightwave by using the modulation signal generated by the modulation signal oscillator 11 as an individual modulation signal.
- the optical harmonics removal unit 80-1 performs modulation using the modulation signal from the modulation signal oscillator 11 as an individual modulation signal, but the optical harmonics removal units 80-2 to 80-4 perform the phase control unit 14
- the modulation is performed by the individual modulation signal to which the phase difference is given by -2 to 14-4. That is, the phase control unit 14-2 sets the phase difference of -.pi./4 for the individual modulation signal input to the light harmonic removal unit 80-2 based on the individual modulation signal input to the light harmonic removal unit 80-1.
- the phase control unit 14-3 controls the individual modulation signal input to the optical harmonic removal unit 80-3 to have a phase difference of ⁇ / 8
- the phase control unit 14-4 controls the light modulation
- the individual modulation signal input to the harmonic removal unit 80-4 is controlled to have a phase difference of - ⁇ / 8.
- the phase control units 14-1 to 14-3 and the phase control unit 14 of the optical harmonics removal units 80-1 to 80-4 have phase control operation points according to the modulation signal frequency information from the modulation signal oscillator 11. Change.
- the optical phase control unit 12-2 controls the output lightwave of the light harmonic removal unit 80-2 to have a phase difference of ⁇ / 4 with the lightwave output of the light harmonic removal unit 80-1 as a reference.
- the phase control unit 12-3 controls the lightwave output from the light harmonics removal unit 80-3 to have a phase difference of - ⁇ / 8
- the light phase control unit 12-4 controls the light harmonics removal unit 80-4. Control is performed so that the output light wave has a phase difference of ⁇ / 8.
- the desired bias point control unit 16 controls the bias points of the output lightwaves of the four optical harmonic removal units 80-1 to 80-4 when the modulation signal is not input so as to minimize the light intensities of the lightwaves. .
- point A in FIG. 6 showing the relationship between the bias voltage and the light intensity of the output lightwave of the light intensity modulator is a desired bias point.
- the optical frequency converter 88 includes two optical harmonics removal units 80-3 and 80-4, two optical phase control units 12-3 and 12-4, and two phase control.
- a second optical circuit consisting of units 14-3 and 14-4 is provided in parallel with the first optical circuit.
- This second optical circuit is the light according to the second embodiment shown in FIG. 8 except that the phases of the output lightwaves of the two optical harmonic removal units 80-3 and 80-4 and the phase of the modulation signal are different. This is equivalent to the configuration of the frequency converter 78.
- the optical phase control unit 12-3 is - ⁇ / 8
- the optical phase control unit 12-4 is ⁇ / 8
- the phase control unit 14-3 is ⁇ / 8
- the phase control unit 14-4 by setting each to provide a phase difference of - [pi] / 8, including the frequency components of f 0 + (8n + 1) f, f 0 + (16n-7) of the frequency component of f the phase is inverted by ⁇ .
- an optical phase control unit which adjusts the phase of the input light wave of each optical harmonic removal unit by increasing the number of the optical harmonic removal units 80 arranged in parallel;
- a phase control unit that changes the phase of the modulation signal that drives the optical harmonics removal unit, and the bias of the optical harmonics removal unit is controlled by the desired bias point control unit, thereby generating an output lightwave of the optical harmonics removal unit
- Arbitrary harmonics can be removed by interference by inverting the phase of the harmonic component intended to be removed by ⁇ among the frequency components included.
- the effect of the present embodiment is the same as the effect of the third embodiment described above, and the optical frequency conversion device 88 uses the four optical harmonics removing units 80-1 to 80-4 to achieve the third and fifth orders. , can be removed 7th and 9th harmonic components, without using an optical bandpass filter, the frequency f 0 of the input lightwave becomes possible to shift by an arbitrary shift amount. Furthermore, as shown in FIG. 7D, even when the input light wave is a data signal, the output data signal is not deteriorated due to overlapping with other harmonic components.
- the optical frequency converter is configured using a plurality of optical single sideband modulators 10, but the present invention is not limited to this.
- the same function can be realized using an optical interferometer or a delay control means.
- the input lightwave of carrier frequency f 0 is converted into the output lightwave of light frequency f 0 + f using the modulation signal of frequency f, and the third and fifth orders included in the output lightwave
- the harmonics that is, the frequency component of the light frequency (f 0 -3f) and the frequency component of the light frequency (f 0 + 5f
- the optical frequency converter 98 comprises an optical suppression carrier modulator 90, a modulation signal oscillator 11, and an optical phase controller 12-. 2, an optical delay control unit 93-2, and two optical interferometers 95-1 and 95-2.
- the optical suppression carrier modulator 90 modulates the input lightwave according to the modulation signal from the modulation signal oscillator 11, and the output lightwave is branched into two, one through the optical interferometer 95-1, the other through the optical phase control unit 12-2, light The light is multiplexed through the delay control unit 93-2 and the optical interference system 95-2, and output as an output lightwave.
- the light suppression carrier modulator 90 is composed of a resonant light intensity modulator 30 and a desired bias point control unit 16.
- the resonant light intensity modulator 30 modulates the input light wave based on the modulation signal from the modulation signal oscillator 11.
- the desired bias point control unit 16 controls the bias point of the resonant light intensity modulator 30 such that the light intensity of the output lightwave of the resonant light intensity modulator 30 when the modulation signal is not input is minimized.
- point A in FIG. 6 showing the relationship between the bias voltage and the light intensity of the output lightwave of the light intensity modulator is a desired bias point.
- the optical interferometer 95 (95-1 and 95-2) is provided with the optical phase control unit 12 and the optical delay control means 93 in one arm of the Mach-Zehnder waveguide.
- the lightwave of one arm is multiplexed with the lightwave of the other arm and output.
- the optical phase control unit 12 of the optical interferometer 95 controls the output lightwave of the optical phase control unit 12 to have a phase difference of ⁇ / 2 with reference to the input lightwave of the optical interferometer, and the optical phase control unit 12 of the optical interferometer 95
- the optical delay control unit 93 controls the input lightwave so as to be delayed by T / 2 and output.
- the optical delay control unit 93 changes the phase control operation point in accordance with the frequency of the modulation signal from the modulation signal oscillator 11.
- the optical phase control unit 12-2 performs control such that a phase difference of ⁇ / 4 is provided between the input light waves of the two optical interferometers 95-1 and 95-2. Also, the optical delay control unit 93-2 performs control such that a delay of T / 4 is provided between the input light waves of the two optical interferometers 95-1 and 95-2. Further, the optical delay control unit 93-2 changes the phase control operation point according to the frequency of the modulation signal from the modulation signal oscillator 11.
- the optical interferometer 95-1 branches the input light wave into two, and the phase of the frequency component of f 0 + (4 n -1) f included in one input light wave is inverted by ⁇ Therefore, when combining, frequency components whose phases are different from each other by ⁇ are canceled out, and as shown in FIG. 7B, the output lightwave of the optical interferometer 95-1 has f 0 + (4n + 1) f It contains frequency components.
- the output lightwave of the optical interferometer 95-2 also has the spectrum shown in FIG. 7B, but the phase of each frequency component is different. That is, the phase of the frequency component of f 0 + (8 n -3) f included in the output lightwave of the optical interferometer 95-2 is inverted by ⁇ . Therefore, by combining the output light waves of the optical interferometers 95-1 and 95-2, frequency components different in phase from each other by ⁇ are canceled out, and f 0 + (8 n + 1) f as shown in FIG. 7C. An output lightwave is obtained which includes frequency components of
- the optical frequency conversion device 98 shifts the input light wave by an arbitrary frequency shift amount, as in the first and second embodiments described above. Further, it is possible to remove the frequency components of f 0 -3f and f 0 + 5f of the output lightwave of the optical frequency converter 98. Also, by dynamically changing the operating frequency f of the modulation signal oscillator 11, it is possible to dynamically shift the frequency of the input lightwave.
- the input lightwave of carrier frequency f 0 is converted to the reverse lightwave, ie, the output lightwave of frequency f 0 -f, and the frequency component of the light frequency (f 0 + 3f) contained in the output lightwave and the light frequency (f 0-
- a phase difference of ⁇ / 2 is given by the optical phase control unit 12 included in the two optical interferometers 95-1 and 95-2, and the optically suppressed carrier modulator
- the phase difference may be controlled to be ⁇ / 4 by the optical phase control unit 12-2 based on the 90 output lightwaves.
- the two optical interferometers 95-1 and 95-2 in the above-described optical frequency converter 98 have three optical phase control units and three optical beams according to the fifth embodiment of the present invention described next. It can be configured using a delay control unit.
- the input lightwave of carrier frequency f 0 is converted into the output lightwave of light frequency f 0 + f using the modulation signal of frequency f, and the third and fifth orders included in the output lightwave
- the harmonics that is, the frequency component of the light frequency (f 0 -3f) and the frequency component of the light frequency (f 0 + 5f
- the optical frequency conversion device 108 includes an optical suppression carrier modulator 90, a modulation signal oscillator 11, and three optical phase control units 12-1 to 12-3. And three optical delay control units 93-2 to 93-4.
- the optical suppression carrier modulator 90 modulates the input lightwave according to the modulation signal from the modulation signal oscillator 11, the output lightwave is branched into four, the first branched light is unchanged, and the second branched light is the optical phase control unit 12-2
- the third branch light passes through the optical phase control unit 12-3 and the optical delay control unit 93-3 through the optical delay control unit 93-2, and the fourth branch light through the optical phase control unit 12-4 through the optical delay control unit 93-3.
- the light is multiplexed through the unit 93-4 and output as an output lightwave.
- the optical phase control unit 12-2 controls the phase difference of - ⁇ / 2 with reference to the output lightwave of the optical suppression carrier modulator 90, and the optical phase control unit 12-3 controls the power of - ⁇ / 4.
- the optical phase control unit 12-4 performs control such that the phase difference is ⁇ 3 ⁇ / 4.
- the optical delay control unit 93-2 gives a delay of T / 2 with reference to the output lightwave of the light suppression carrier modulator 90, and the optical delay control unit 93-3 gives a delay of T / 4, 93-4 is controlled to give a delay of 3T / 4.
- the three optical delay control units 93-1, 93-2, and 93-3 change the phase control operation point according to the frequency of the modulation signal from the modulation signal oscillator 11.
- the output lightwave of the optical delay control unit 93-2 has the spectrum shown in FIG. 2B, but the phase of the frequency component of f 0 + (4n-1) f (n is an integer) is inverted by ⁇ . Therefore, when the output lightwave of the light suppression carrier modulator 90 and the output lightwave of the optical delay control unit 93-2 are multiplexed, the frequency components whose phases are different from each other by ⁇ are canceled out, as shown in FIG. 7B.
- the frequency component of f 0 + (4n + 1) f is included.
- the multiplexed light waves output lightwave of the two optical delay controller 93-3 and 93-4 has a frequency component f 0 + (4n + 1) f shown in FIG. 7B), of which f 0 + ( 8n-3) The phase of the frequency component of f is inverted by ⁇ .
- the optical frequency conversion device 108 can shift the input light wave by an arbitrary frequency shift amount as in the fourth embodiment described above, and further, the light It becomes possible to remove the frequency components of f 0 -3f and f 0 + 5f of the output lightwave of the frequency conversion device 108. Also, by dynamically changing the operating frequency f of the modulation signal oscillator 11, it is possible to dynamically shift the frequency of the input lightwave.
- the optical frequency converter according to the sixth embodiment of the present invention realizes more accurate optical frequency conversion by using three or more optical interferometers.
- the input lightwave of carrier frequency f 0 is converted to an output lightwave of light frequency f 0 + f using a modulation signal of frequency f, and the third and fifth orders included in the output lightwave
- the case of simultaneously removing the 7th and 9th harmonic components will be described as an example.
- the optical frequency conversion device 118 includes the optical suppression carrier modulator 90, the modulation signal oscillator 11, four optical interferometers 95-1 to 95-4, and three.
- the optical suppression carrier modulator 90 modulates the input lightwave according to the modulation signal from the modulation signal oscillator 11, the output lightwave is branched into four, the first branched light passes through the optical interferometer 95-1, and the second branched light is optical
- the third branched light passes through the phase control unit 12-2, the optical delay control unit 93-2, and the optical interferometer 95-2 as the optical phase control unit 12-3, the optical delay control unit 93-3, and the optical interferometer 95-
- the fourth branched light is multiplexed through the optical phase control unit 12-4, the optical delay control unit 93-4, and the optical interferometer 95-4 through 3 and output as an output lightwave.
- the optical phase control unit 12-2 sets the phase difference of - ⁇ / 8 so that the phase difference of the light suppression carrier modulator 90 is - ⁇ / 4 with respect to the output lightwave of the light suppression carrier modulator 90 as a reference.
- the optical phase control unit 12-4 performs control so as to have a phase difference of -3 ⁇ / 8 so that
- the optical delay control section 93-2 has a delay of T / 8 so that the optical delay control section 93-2 has a delay of T / 4 on the basis of the output lightwave of the light suppression carrier modulator 90.
- the optical delay control unit 93-4 controls each to have a delay of 3T / 8.
- a first optical circuit composed of an optical interferometer 95-1, an optical phase controller 12-2, an optical delay controller 93-2, and an optical interferometer 95-2, and
- the output lightwave includes frequency components of f 0 + (8n + 1) f (n is an integer) as shown in FIG. 7D because it is equivalent to the optical frequency converter 108 in the fifth embodiment.
- the output lightwave of the second optical circuit to be included includes the frequency component of f 0 + (8n + 1) f as shown in FIG. 7D, among which the frequency component of f 0 + (16n-7) f Phase is inverted by ⁇ .
- the optical frequency conversion device 118 has the same effects as the fourth and fifth embodiments described above, and is arranged in parallel according to the desired accuracy.
- An optical phase control unit that increases the number of optical interferometers to be adjusted and adjusts the phase of the input lightwave of each optical interferometer, and an optical delay control unit that controls the delay amount of the input lightwave of the optical interferometer;
- Arbitrary harmonics can be removed by interference by inverting the phase of the harmonic component to be removed by ⁇ among the frequency components included in the output lightwave of the removal unit.
- An optical frequency conversion device that frequency-converts an input lightwave according to a modulation signal using an optical single sideband modulation method to generate an output lightwave, A plurality of phase control means for respectively generating a plurality of individual modulation signals different in phase from the modulation signal; A plurality of optical single sideband modulation means for respectively modulating the input lightwave in accordance with the plurality of individual modulation signals; A plurality of optical phase control means for giving an optical phase difference to a plurality of light waves respectively outputted from the plurality of optical single sideband modulation means; Combining means for combining the plurality of light waves output from the plurality of light phase control means to generate the output light wave; An optical frequency converter characterized in that the phase difference between the plurality of individual modulation signals and the optical phase difference are set so that a predetermined harmonic component other than the target frequency of the output lightwave is removed. .
- the plurality of light waves respectively output from the plurality of optical phase control means have the same frequency spectrum, and the phase difference of the plurality of individual modulation signals such that the phase difference is ⁇ with respect to the predetermined harmonic component.
- the input lightwave is an optical signal of frequency f 0
- the modulation signal is an electrical signal of which frequency f changes
- the output lightwave is an optical signal of which the target frequency is f 0 + f or f 0 ⁇ f
- the optical frequency converter according to any one of supplementary notes 1 to 3 characterized by the above.
- each of the plurality of optical single sideband modulation means the light intensity of the output lightwave of the optical single sideband modulation means is minimized while the individual modulation signal to the optical single sideband modulation means is not input.
- the optical frequency converter according to any one of appendices 1-5, wherein the bias is set as follows.
- An optical frequency conversion method for frequency converting an input lightwave according to a modulation signal using sideband modulation and generating an output lightwave A plurality of phase control means respectively generate a plurality of individual modulation signals different in phase from the modulation signal, A plurality of optical single sideband modulation means respectively modulate the input lightwave according to the plurality of individual modulation signals; A plurality of optical phase control means give optical phase differences to the plurality of light waves respectively output from the plurality of optical single sideband modulation means; Combining means combines the plurality of light waves output from the plurality of light phase control means to generate the output light wave; A phase difference between the plurality of individual modulation signals and the light phase difference is set so as to remove predetermined harmonic components other than a target frequency of the output light wave.
- the plurality of light waves respectively output from the plurality of optical phase control means have the same frequency spectrum, and the phase difference of the plurality of individual modulation signals such that the phase difference is ⁇ with respect to the predetermined harmonic component.
- the input lightwave is an optical signal of frequency f 0
- the modulation signal is an electrical signal of which frequency f changes
- the output lightwave is an optical signal of which the target frequency is f 0 + f or f 0 ⁇ f
- each of the plurality of optical single sideband modulation means the light intensity of the output lightwave of the optical single sideband modulation means is minimized while the individual modulation signal to the optical single sideband modulation means is not input.
- the optical frequency conversion method according to any one of appendices 7-11, wherein the bias is set as follows.
- An optical transmitter that frequency-converts an input light wave according to a modulation signal and transmits it using a sideband modulation method, A plurality of phase control means for respectively generating a plurality of individual modulation signals different in phase from the modulation signal; A plurality of optical single sideband modulation means for respectively modulating the input optical signal according to the plurality of individual modulation signals; A plurality of optical phase control means for giving an optical phase difference to a plurality of optical signals respectively outputted from the plurality of optical single sideband modulation means; Combining means for combining a plurality of optical signals output from the plurality of optical phase control means to generate a transmission light signal; An optical transmitter characterized in that the phase difference between the plurality of individual modulation signals and the optical phase difference are set so that a predetermined harmonic component other than the target frequency of the transmission optical signal is removed. .
- the plurality of optical signals respectively output from the plurality of optical phase control means have the same frequency spectrum, and the phase difference of the plurality of individual modulation signals such that the phase difference is ⁇ with respect to the predetermined harmonic component
- the input optical signal is an optical signal of frequency f 0
- the modulation signal is an electrical signal of which frequency f changes
- the transmission optical signal is an optical signal of which the target frequency is f 0 + f or f 0 -f
- the optical transmitter according to any one of appendices 13-15, characterized in that.
- optical frequency converter that frequency-converts an input lightwave according to a modulation signal using sideband modulation and generates an output lightwave, Optically suppressed carrier wave modulation means for modulating the input light wave according to the modulation signal;
- the optical suppression carrier modulation means has a plurality of waveguides for receiving the light wave output from the light suppression carrier modulation means and propagating the plurality of branched lights of the light wave, and combines the plurality of branched lights propagated through the plurality of waveguides.
- First interference means for generating the output lightwave The plurality of waveguides of the first light interference means are provided with a first light phase control means, a first light delay control means, and a second light interference means, and the second light interference means includes two waveguides.
- a second optical phase control means and a second optical delay control means are provided in one of the waveguides, The optical phase difference between the first optical phase control means and the first optical delay control means provided in each of the plurality of waveguides such that predetermined harmonic components other than the target frequency of the output lightwave are removed
- the first optical phase control means and the first optical delay control means such that the light waves respectively output from the plurality of waveguides have the same frequency spectrum and the phase difference is ⁇ with respect to the predetermined harmonic component.
- the input lightwave is an optical signal of frequency f 0
- the modulation signal is an electrical signal of which frequency f changes
- the output lightwave is an optical signal of which the target frequency is f 0 + f or f 0 ⁇ f
- the optical frequency converter as set forth in Supplementary Note 19 or 20, characterized in that
- An optical frequency conversion method for frequency converting an input lightwave according to a modulation signal using sideband modulation and generating an output lightwave A light suppression carrier modulation means modulates the input lightwave according to the modulation signal;
- the first light interference means receives the lightwave output from the light suppression carrier modulation means, propagates the plurality of branched lights of the lightwave through the plurality of waveguides, and propagates the plurality of branched lights.
- the plurality of waveguides of the first light interference means are provided with a first light phase control means, a first light delay control means, and a second light interference means, and the second light interference means includes two waveguides.
- a second optical phase control means and a second optical delay control means are provided in one of the waveguides,
- the optical phase difference and the optical delay amount of the first optical phase control means and the first optical delay control means provided in each of the plurality of waveguides are removed by predetermined harmonic components other than the target frequency of the output light wave.
- the first optical phase control means and the first optical delay control means such that the light waves respectively output from the plurality of waveguides have the same frequency spectrum and the phase difference is ⁇ with respect to the predetermined harmonic component.
- 24. The optical frequency conversion method according to appendix 23, wherein the optical phase difference and the optical delay amount are set respectively.
- the input lightwave is an optical signal of frequency f 0
- the modulation signal is an electrical signal of which frequency f changes
- the output lightwave is an optical signal of which the target frequency is f 0 + f or f 0 ⁇ f
- the optical frequency conversion method according to Additional remark 23 or 24, characterized by the above.
- the present invention is applicable to an optical frequency converter used in an optical transmitter or the like.
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Abstract
Description
図4に示すように、本発明の一実施形態による光周波数変換装置は、複数個(n個)の光変調部MOD1~MODnと、光変調部MOD1~MODnにそれぞれ接続されたn個の位相制御部101-1~101-nおよびn個の光位相制御部201-1~201-nとを有し、各光変調部は図1に示す光単側波帯変調器10と位相制御部14とからなる。光変調部MOD1~MODnの端子RF1~RFnは、それぞれ対応する光単側波帯変調器10の端子RFAに直接接続されると共に、位相制御部14を介して端子RFBに接続される。位相制御部14は、端子RFAおよび端子RFBにそれぞれ入力する個別変調信号の間に位相差φ0(ここではφ0=π/2)を与えるように制御される。
本発明の第1実施例による光周波数変換装置は2つの光単側波帯変調器を用いて構成される。ここでは、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次と5次の高調波、すなわち光周波数(f0-3f)の周波数成分と光周波数(f0+5f)の周波数成分とを同時に除去する場合を一例として説明する。
図5に示すように、本実施例による光周波数変換装置68は、2つの光単側波帯変調器10-1および10-2、変調信号発振器11、光位相制御部12、2つの光移相量制御部13-1および13-2、端子RFAとRFBとの間の位相差を与えるための位相制御部14-1および14-2、光単側波帯変調器間の変調信号位相差を与えるための位相制御部14-3、および、所望バイアス点制御部16から構成される。
上述した構成を有する光周波数変換装置68において、図7(A)に示す周波数スペクトルを有する搬送波周波数f0の連続波レーザ光が入力するものとする。このとき、光単側波帯変調器10-1の出力光波の周波数スペクトルは、図7(B)に示すように、f0+(4n+1)f(nは整数)の周波数成分を含む。
以上に説明したように、光周波数変換装置68は2つの光単側波帯変調器10-1および10-2を利用することにより、光バンドパスフィルタを用いることなく、入力光波の周波数f0を任意の偏移量だけ偏移させることが可能となる。しかも、図7(D)に示すように、入力光波がデータ信号である場合も、他の高調波成分との重なり合いによる出力データ信号の劣化を生じない。
本発明の第2実施例による光周波数変換装置は4つの共振型光強度変調器を用いて構成される。ここでは、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次と5次の高調波、すなわち光周波数(f0-3f)の周波数成分と光周波数(f0+5f)の周波数成分とを同時に除去する場合を一例として説明する。
図8において、本実施例による光周波数変換装置78では、図5における光単側波帯変調器10-1および10-2を2対の共振型強度変調器30-1および30-2と30-3および30-4とを利用して構成する。光周波数変換装置78は、共振型光強度変調器30-1~30-4の他に、変調信号発振器11と、光位相制御部12-2、12-3および12-4と、位相制御部14-2、14-3および14-4と、所望バイアス点制御部16と、から構成される。
本実施例による光周波数変換装置78の基本的な動作は第1実施例と同様であるから、図7及び図8を参照しながら説明する。
本実施例の効果は上述した第1実施例の効果と同様であり、光周波数変換装置78は4つの共振型光強度変調器30-1~30-4を利用することにより、光バンドパスフィルタを用いることなく、入力光波の周波数f0を任意の偏移量だけ偏移させることが可能となる。しかも、図7(D)に示すように、入力光波がデータ信号である場合も、他の高調波成分との重なり合いによる出力データ信号の劣化を生じない。
本発明の第3実施例による光周波数変換装置は4つの光高調波除去部を用いて構成される。ここでは、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次、5次、7次および9次の高調波成分を同時に除去する場合を一例として説明する。
図9において、本実施例による光周波数変換装置88は、4つの光高調波除去部80-1~80-4と、変調信号発振器11と、3つの光位相光位相制御部12-1~12-3と、3つの位相制御部14-1~14-3と、所望バイアス点制御部16と、から構成される。図10に示すように、光高調波除去部80は、光単側波帯変調器10と、所望光移相量制御部13と、位相制御部14とを備える。
図9に示す本実施例による光周波数変換装置88において、2つの光高調波除去部80-1および80-2と、光位相制御部12-2と、位相制御部14-2とから構成される第1の光回路は、図8に示す第2実施例による光周波数変換装置78の構成と等価である。したがって、光高調波除去部80-1の出力光波と光位相制御部12-2の出力光波とを合波すると、図7(C)に示すように、f0+(8n+1)f(nは整数)の周波数成分を含む出力光波が得られる。ただし、図7(C)の周波数スペクトルには6次以上の高調波が図示されていない。
このように所望の精度に応じて、並列に配置する光高調波除去部80の個数を増やし、各光高調波除去部の入力光波の位相を調整する光位相制御部と、光高調波除去部を駆動する変調信号の位相を変化する位相制御部を備え、所望バイアス点制御部にて光高調波除去部のバイアスを制御することにより、光高調波除去部の出力光波に含まれる周波数成分のうち、除去を目的とする高調波成分の位相をπだけ反転することにより、干渉により任意の高調波を除去することが可能である。
上述した第1実施例~第3実施例では、光単側波帯変調器10を複数個用いて光周波数変換装置を構成したが、本発明はこれに限定されるものではなく、以下に述べる第4~第6実施例のように、光干渉計や遅延制御手段を用いて同等の機能を実現することもできる。以下、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次と5次の高調波、すなわち光周波数(f0-3f)の周波数成分と光周波数(f0+5f)の周波数成分とを同時に除去する場合を一例として説明する。
図11および図12に示すように、本発明の第4実施例による光周波数変換装置98は、光抑圧搬送波変調器90と、変調信号発振器11と、光位相制御部12-2と、光遅延制御部93-2と、2つの光干渉計95-1および95-2とから構成される。光抑圧搬送波変調器90は入力光波を変調信号発振器11から変調信号に従って変調し、その出力光波は2分岐され、一方は光干渉計95-1を通して、他方は光位相制御部12-2、光遅延制御部93-2および光干渉系95-2を通して合波され、出力光波として出力される。
まず、光抑圧搬送波変調器90は、図7(A)に示す光周波数スペクトルを有する搬送波周波数f0の連続波レーザ光を入力したときに、図2(B)に示すようにf0+(2n-1)f(nは整数)の周波数成分を有する光波を生成する。
上述したように、本実施例による光周波数変換装置98は、上述した第1実施例および第2実施例と同様に、入力光波を任意の周波数偏移量だけ偏移させることができ、さらに光周波数変換装置98の出力光波のf0-3fとf0+5fの周波数成分を除去することが可能となる。また、変調信号発振器11の動作周波数fを動的に変化させることにより、入力光波の周波数を動的に偏移させることが可能である。
上述した光周波数変換装置98における2つの光干渉計95-1および95-2は、次に述べる本発明の第5実施例によれば、3つの光位相制御部と3つの光遅延制御部とを利用して構成することができる。以下、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次と5次の高調波、すなわち光周波数(f0-3f)の周波数成分と光周波数(f0+5f)の周波数成分とを同時に除去する場合を一例として説明する。
図13に示すように、本実施例による光周波数変換装置108は、光抑圧搬送波変調器90と、変調信号発振器11と、3つの光位相制御部12-1~12-3と、3つの光遅延制御部93-2~93-4とからなる。光抑圧搬送波変調器90は入力光波を変調信号発振器11から変調信号に従って変調し、その出力光波は4分岐され、第1の分岐光はそのまま、第2の分岐光は光位相制御部12-2および光遅延制御部93-2を通して、第3の分岐光は光位相制御部12-3および光遅延制御部93-3を通して、第4の分岐光は光位相制御部12-4および光遅延制御部93-4を通して合波され出力光波として出力される。
まず、光抑圧搬送波変調器90は、図7(A)に示す光周波数スペクトルを有する搬送波周波数f0の連続波レーザ光を入力したときに、図2(B)に示すようにf0+(2n-1)f(nは整数)の周波数成分を有する光波を生成する。
上述したように、本実施例による光周波数変換装置108は、上述した第4実施例と同様に、入力光波を任意の周波数偏移量だけ偏移させることができ、さらに光周波数変換装置108の出力光波のf0-3fとf0+5fの周波数成分を除去することが可能となる。また、変調信号発振器11の動作周波数fを動的に変化させることにより、入力光波の周波数を動的に偏移させることが可能である。
本発明の第6実施例による光周波数変換装置は3つ以上の光干渉計を用いることにより更に高精度な光周波数変換を実現する。ここでは、説明を煩雑にしないために、搬送波周波数f0の入力光波を周波数fの変調信号を用いて光周波数f0+fの出力光波に変換し、さらに出力光波に含まれる3次、5次、7次および9次の高調波成分を同時に除去する場合を一例として説明する。
図14において、本実施例による光周波数変換装置118は、光抑圧搬送波変調器90と、変調信号発振器11と、4つの光干渉計95-1~95-4と、3つの光位相制御部12-2~12-4と、3つの光遅延制御部93-2~93-4と、から構成される。
光干渉計95-1と、光位相制御部12-2、光遅延制御手段93-2および光干渉計95-2とから構成される第1の光回路と、上述の第5実施例における光周波数変換装置108とは等価であるため、出力光波は図7(D)に示すようにf0+(8n+1)f(nは整数)の周波数成分を含む。
上述したように、本実施例による光周波数変換装置118は、上述した第4実施例および第5実施例と同様の効果を有すると共に、所望の精度に応じて、並列に配置する光干渉計の個数を増やし、各光干渉計の入力光波の位相を調整する光位相制御部と、光干渉計の入力光波の遅延量を制御する光遅延制御部とを備え、光高調波除去部の出力光波に含まれる周波数成分のうち、除去すべき高調波成分の位相をπだけ反転することにより、干渉によって任意の高調波を除去することが可能である。
上述した実施例の一部あるいは全部は、以下の付記のようにも記載されうるが、これらに限定されるものではない。
光単側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換装置であって、
前記変調信号から位相が異なる複数の個別変調信号をそれぞれ生成する複数の位相制御手段と、
前記入力光波を前記複数の個別変調信号に従ってそれぞれ変調を行う複数の光単側波帯変調手段と、
前記複数の光単側波帯変調手段からそれぞれ出力された複数の光波にそれぞれ光位相差を与える複数の光位相制御手段と、
前記複数の光位相制御手段から出力される複数の光波を合波して前記出力光波を生成する合波手段と、
を有し、前記出力光波の目的周波数以外の所定高調波成分が除去されるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする光周波数変換装置。
前記複数の光位相制御手段からそれぞれ出力される前記複数の光波は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする付記1に記載の光周波数変換装置。
前記複数の位相制御手段の個数をn、前記入力光波の周波数をf0、前記変調信号の周波数をf、前記所定高調波成分の周波数をf0+(2m+1)fとした時、nはlog2(m)以上の最小の整数であり、前記複数の個別変調信号の位相差および前記光位相差はそれぞれπ/2k+1および-π/2k+1(k=1,…,n-1)であることを特徴とする付記1または2に記載の光周波数変換装置。
前記入力光波は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記出力光波は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする付記1-3の1項に記載の光周波数変換装置。
前記複数の位相制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする付記4に記載の光周波数変換装置。
前記複数の光単側波帯変調手段の各々は、当該光単側波帯変調手段に対する個別変調信号が未入力である状態で当該光単側波帯変調手段の出力光波の光強度が最小になるようにバイアス設定されることを特徴とする付記1-5のいずれか1項に記載の光周波数変換装置。
側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換方法であって、
複数の位相制御手段が前記変調信号から位相が異なる複数の個別変調信号をそれぞれ生成し、
複数の光単側波帯変調手段が前記複数の個別変調信号に従って前記入力光波をそれぞれ変調し、
複数の光位相制御手段が前記複数の光単側波帯変調手段からそれぞれ出力された複数の光波にそれぞれ光位相差を与え、
合波手段が前記複数の光位相制御手段から出力される複数の光波を合波して前記出力光波を生成し、
前記複数の個別変調信号の位相差および前記光位相差は前記出力光波の目的周波数以外の所定高調波成分が除去されるように設定されることを特徴とする光周波数変換方法。
前記複数の光位相制御手段からそれぞれ出力される前記複数の光波は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする付記7に記載の光周波数変換方法。
前記複数の位相制御手段の個数をn、前記入力光波の周波数をf0、前記変調信号の周波数をf、前記所定高調波成分の周波数をf0+(2m+1)fとした時、nはlog2(m)以上の最小の整数であり、前記複数の個別変調信号の位相差および前記光位相差はそれぞれπ/2k+1および-π/2k+1(k=1,…,n-1)であることを特徴とする付記7または8に記載の光周波数変換装置。
前記入力光波は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記出力光波は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする付記7-9のいずれか1項に記載の光周波数変換方法。
前記複数の位相制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする付記10に記載の光周波数変換方法。
前記複数の光単側波帯変調手段の各々は、当該光単側波帯変調手段に対する個別変調信号が未入力である状態で当該光単側波帯変調手段の出力光波の光強度が最小になるようにバイアス設定されることを特徴とする付記7-11のいずれか1項に記載の光周波数変換方法。
側波帯変調方式を利用して入力光波を変調信号に従って周波数変換して送信する光送信機であって、
前記変調信号から位相が異なる複数の個別変調信号をそれぞれ生成する複数の位相制御手段と、
前記入力光信号を前記複数の個別変調信号に従ってそれぞれ変調する複数の光単側波帯変調手段と、
前記複数の光単側波帯変調手段からそれぞれ出力された複数の光信号にそれぞれ光位相差を与える複数の光位相制御手段と、
前記複数の光位相制御手段から出力される複数の光信号を合波して送信光信号を生成する合波手段と、
を有し、前記送信光信号の目的周波数以外の所定高調波成分が除去されるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする光送信機。
前記複数の光位相制御手段からそれぞれ出力される前記複数の光信号は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする付記13に記載の光送信機。
前記複数の位相制御手段の個数をn、前記入力光波の周波数をf0、前記変調信号の周波数をf、前記所定高調波成分の周波数をf0+(2m+1)fとした時、nはlog2(m)以上の最小の整数であり、前記複数の個別変調信号の位相差および前記光位相差はそれぞれπ/2k+1および-π/2k+1(k=1,…,n-1)であることを特徴とする付記13または14に記載の光周波数変換装置。
前記入力光信号は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記送信光信号は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする付記13-15のいずれか1項に記載の光送信機。
前記複数の位相制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする付記16に記載の光送信機。
前記複数の光単側波帯変調手段の各々は、当該光単側波帯変調手段に対する個別変調信号が未入力である状態で当該光単側波帯変調手段の出力光波の光強度が最小になるようにバイアス設定されることを特徴とする付記13-17のいずれか1項に記載の光送信機。
側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換装置であって、
前記入力光波を前記変調信号に従って変調する光抑圧搬送波変調手段と、
前記光抑圧搬送波変調手段から出力された光波を入力し、その光波の複数の分岐光をそれぞれ伝播させる複数の導波路を有し、前記複数の導波路を伝播した複数の分岐光を合波して前記出力光波を生成する第1光干渉手段と、
前記第1光干渉手段の前記複数の導波路には、第1光位相制御手段、第1光遅延制御手段および第2光干渉手段が設けられ、前記第2光干渉手段は2つの導波路を有し、一方の導波路には第2光位相制御手段および第2光遅延制御手段が設けられ、
前記出力光波の目的周波数以外の所定高調波成分が除去されるように、前記複数の導波路の各々に設けられた前記第1光位相制御手段および前記第1光遅延制御手段の光位相差および光遅延量がそれぞれ設定されることを特徴とする光周波数変換装置。
前記複数の導波路からそれぞれ出力される光波は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記第1光位相制御手段および前記第1光遅延制御手段の光位相差および光遅延量がそれぞれ設定されることを特徴とする付記19に記載の光周波数変換装置。
前記入力光波は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記出力光波は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする付記19または20に記載の光周波数変換装置。
前記第1光遅延制御手段および前記第2光遅延制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする付記21に記載の光周波数変換装置。
側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換方法であって、
光抑圧搬送波変調手段が前記入力光波を前記変調信号に従って変調し、
第1光干渉手段が前記光抑圧搬送波変調手段から出力された光波を入力し、その光波の複数の分岐光を複数の導波路を通してそれぞれ伝播させ、前記複数の導波路を伝播した複数の分岐光を合波して前記出力光波を生成し、
前記第1光干渉手段の前記複数の導波路には、第1光位相制御手段、第1光遅延制御手段および第2光干渉手段が設けられ、前記第2光干渉手段は2つの導波路を有し、一方の導波路には第2光位相制御手段および第2光遅延制御手段が設けられ、
前記複数の導波路の各々に設けられた前記第1光位相制御手段および前記第1光遅延制御手段の光位相差および光遅延量が、前記出力光波の目的周波数以外の所定高調波成分が除去されるように、それぞれ設定される、
ことを特徴とする光周波数変換方法。
前記複数の導波路からそれぞれ出力される光波は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記第1光位相制御手段および前記第1光遅延制御手段の光位相差および光遅延量がそれぞれ設定されることを特徴とする付記23に記載の光周波数変換方法。
前記入力光波は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記出力光波は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする付記23または24に記載の光周波数変換方法。
前記第1光遅延制御手段および前記第2光遅延制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする付記25に記載の光周波数変換方法。
11 変調信号発振器
12、201 光位相制御部
13 光移相量制御部
14、101 位相制御部
16 所望バイアス点制御部
30 共振型光強度変調器
32 光移相器
68、78、88、98、108、118 光周波数変換装置
80 高調波除去部
90 光抑圧搬送波変調器
93 光遅延制御部
95 光干渉計
Claims (9)
- 側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換装置であって、
前記変調信号から位相が異なる複数の個別変調信号をそれぞれ生成する複数の位相制御手段と、
前記入力光波を前記複数の個別変調信号に従ってそれぞれ変調する複数の光単側波帯変調手段と、
前記複数の光単側波帯変調手段からそれぞれ出力された複数の光波にそれぞれ光位相差を与える複数の光位相制御手段と、
前記複数の光位相制御手段から出力される複数の光波を合波して前記出力光波を生成する合波手段と、
を有し、前記出力光波の目的周波数以外の所定高調波成分が除去されるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする光周波数変換装置。 - 前記複数の光位相制御手段からそれぞれ出力される前記複数の光波は同一の周波数スペクトルを有し、かつ前記所定高調波成分について位相差がπとなるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする請求項1に記載の光周波数変換装置。
- 前記複数の位相制御手段の個数をn、前記入力光波の周波数をf0、前記変調信号の周波数をf、前記所定高調波成分の周波数をf0+(2m+1)fとした時、nはlog2(m)以上の最小の整数であり、前記複数の個別変調信号の位相差および前記光位相差はそれぞれπ/2k+1および-π/2k+1(k=1,…,n-1)であることを特徴とする付記1または2に記載の光周波数変換装置。
- 前記入力光波は周波数f0の光信号であり、前記変調信号は周波数fが変化する電気信号であり、前記出力光波は前記目的周波数がf0+fあるいはf0-fの光信号であることを特徴とする請求項1-3のいずれか1項に記載の光周波数変換装置。
- 前記複数の位相制御手段は前記変調信号の周波数fに依存して位相制御動作点を変化させることを特徴とする請求項4に記載の光周波数変換装置。
- 前記複数の光単側波帯変調手段の各々は、当該光単側波帯変調手段に対する個別変調信号が未入力である状態で当該光単側波帯変調手段の出力光波の光強度が最小になるようにバイアス設定されることを特徴とする請求項1-5のいずれか1項に記載の光周波数変換装置。
- 側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換方法であって、
複数の位相制御手段が変調信号から位相が異なる複数の個別変調信号をそれぞれ生成し、
複数の光単側波帯変調手段が前記複数の個別変調信号に従って前記入力光波をそれぞれ変調し、
複数の光位相制御手段が前記複数の光単側波帯変調手段からそれぞれ出力された複数の光波にそれぞれ光位相差を与え、
合波手段が前記複数の光位相制御手段から出力される複数の光波を合波して前記出力光波を生成し、
前記複数の個別変調信号の位相差および前記光位相差は前記出力光波の目的周波数以外の所定高調波成分が除去されるように設定されることを特徴とする光周波数変換方法。 - 変調信号に従って入力光信号を周波数変換して送信する光送信機であって、
前記変調信号から位相が異なる複数の個別変調信号をそれぞれ生成する複数の位相制御手段と、
前記入力光信号を前記複数の個別変調信号に従ってそれぞれ変調する複数の光単側波帯変調手段と、
前記複数の光単側波帯変調手段からそれぞれ出力された複数の光信号にそれぞれ光位相差を与える複数の光位相制御手段と、
前記複数の光位相制御手段から出力される複数の光信号を合波して送信光信号を生成する合波手段と、
を有し、前記送信光信号の目的周波数以外の所定高調波成分が除去されるように前記複数の個別変調信号の位相差と前記光位相差とが設定されることを特徴とする光送信機。 - 側波帯変調方式を利用して入力光波を変調信号に従って周波数変換し出力光波を生成する光周波数変換装置であって、
前記入力光波を前記変調信号に従って変調する光抑圧搬送波変調手段と、
前記光抑圧搬送波変調手段から出力された光波を入力し、その光波の複数の分岐光をそれぞれ伝播させる複数の導波路を有し、前記複数の導波路を伝播した複数の分岐光を合波して前記出力光波を生成する第1光干渉手段と、
前記第1光干渉手段の前記複数の導波路には、第1光位相制御手段、第1光遅延制御手段および第2光干渉手段が設けられ、前記第2光干渉手段は2つの導波路を有し、一方の導波路には第2光位相制御手段および第2光遅延制御手段が設けられ、
前記出力光波の目的周波数以外の所定高調波成分が除去されるように、前記複数の導波路の各々に設けられた前記第1光位相制御手段および前記第1光遅延制御手段の光位相差および光遅延量がそれぞれ設定されることを特徴とする光周波数変換装置。
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