JP2017194580A - Optical system for optoelectronic integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a delay quantity of an optical trigger pulse without using a mechanical movable part.SOLUTION: An optical system comprises: a 1:N optical splitter 102; a light intensity modulation part 103 which can individually adjusting intensities of N optical trigger pulses individually; a frequency shift part 104 which individually shifts frequencies of the N optical trigger pulses by shift quantities corresponding to the respective intensities; a dispersant part 105 which individually delays the N optical trigger pulses by quantities corresponding to the respective frequencies; N fixed optical delay lines 106-1 to 106-N which have optical delay quantities increasing in sequence at unit intervals and are connected to N output ends of the dispersant part 105, one to one; and an N-channel optical fiber coupling system 107 which has N optical fibers 109-1 to 109-N arranged in a bundle, and irradiates a corresponding optical trigger type transistor circuit on an optoelectronic integrated circuit 108 with optical trigger pulses.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical trigger type optoelectronic integrated circuit operated by an optical trigger pulse, and more specifically to an optoelectronic integrated circuit whose unit interval during operation depends on the time interval of the optical trigger pulse. The present invention relates to an optical system that irradiates a trigger transistor circuit with an optical trigger pulse while shifting time.

  In recent years, with the rise of packet-based networks centered on the Internet, there has been a demand for an increase in optical communication capacity and improvement in flexibility and expandability. In addition to a global IP network, a network within a data center is also required to realize a packet switch network with low power consumption and a large capacity. Therefore, it is necessary to realize a network (optical packet switch network) using optical packets that is excellent in terms of bandwidth utilization efficiency, flexibility, and expandability.

  In order to realize such an optical packet switch network, generation of an asynchronous arbitrary length burst optical packet signal is indispensable. For this purpose, a low-speed (<1 Gbps) parallel signal output from a random access memory (RAM) in an optical packet router that is a node of the optical packet switch network is converted into a high-speed (> 10 Gbps) serial signal used in an optical fiber. The operation of converting must be performed on the burst signal. In a general parallel-serial conversion circuit, it is difficult to cope with such a burst signal for clock recovery used internally, and in many cases, the parallel-serial conversion circuit itself is large-scale. There is a problem that large power consumption is required.

  In order to solve these problems, an optical trigger sampling circuit using a charge / discharge MSM-PD (Metal-Semiconductor-Metal Photo Detector) (see, for example, Non-Patent Document 1) has been proposed (for example, Patent Document 1). 1, refer to Non-Patent Document 2). Furthermore, based on OCTA (Optically Clocked Transistor Array) technology that applies this optical trigger type sampling, which has developed this optical trigger type sampling circuit and realized the tolerance of optical power fluctuation using differential trigger. A parallel-serial conversion circuit (see, for example, Patent Document 2 and Non-Patent Document 3) has also been proposed. A circuit diagram of the differential trigger type parallel-serial conversion circuit is shown in FIG.

  In the differential trigger parallel / serial conversion circuit shown in FIG. 3, MSM-PDs 401-1, 402-1 are used as photoelectric converters, and HEMTs (High Electron Mobility Transistors) 401-3, 401-4, 402 are used as transistors. -3, 402-4 is used.

  As a basic principle, in the first channel block 401, the parallel signal input from the first channel signal input terminal 401-5 is obtained by using the steep rise of the pulse generated by the MSM-PD 401-1. Cut out into a rectangle, generate a 1-bit serial signal, and output the serial signal to the signal output line 411, thereby realizing parallel-serial conversion for the first channel.

  Such an operation is shifted by one unit interval (however, the unit interval of serial signal output. Hereinafter, the expression “unit interval” is all based on the data rate of serial signal output). Continuous parallel-serial conversion is performed in a loop operation in which the same operation is performed up to the third channel block 403, the same operation is performed up to the N-th channel block 40N, and the operation is finally continued to the first channel block 401 again. Operation is realized.

Hereinafter, a more specific process of parallel-serial conversion will be described focusing on the first channel block 401. First, in the differential trigger type parallel-serial conversion circuit, the potentials V _NH and V _MSM are positively biased and the potential V _NL is negatively biased. Therefore, a positive potential is applied to one electrode A of the MSM-PD 401-1 through the resistor 401-8, and the resistor 401-9 is applied to the other electrode B of the MSM-PD 401-1 and the gate of the HEMT 401-3. 401-10 and a negative potential is applied to the gate of the HEMT 401-4 by a resistor 402-7. Therefore, the HEMT 401-3 is turned off in the absence of an optical trigger pulse, and the HEMT 401-4 Is on.

  Here, when the optical trigger pulse 401-6 is irradiated to the MSM-PD 401-1, a negative pulse is generated in one electrode A of the MSM-PD 401-1 and a positive pulse is applied to the other electrode B. Occur. Although the HEMT 401-3 is in an off state, the HEMT 401-3 is turned on by a positive pulse generated at the electrode B of the MSM-PD 401-1. The HEMT 401-4 remains on. Accordingly, since both the HEMT 401-3 and the HEMT 401-4 are turned on, the signal of the first channel signal input terminal 401-5 starts to flow through the signal output line 411.

  After one unit interval of the optical trigger pulse 401-6, the optical trigger pulse 402-6 is irradiated to the MSM-PD 402-1 of the second channel block 402. As a result, like MSM-PD 401-1, a negative pulse is generated at one electrode A of MSM-PD 402-1 and a positive pulse is generated at the other electrode B. The negative pulse generated from the electrode A of the MSM-PD 402-1 is level-converted through the capacitor 402-2 and turns off the HEMT 401-4. As a result of the irradiation of the optical trigger pulse 402-6 shifted by one unit interval in this way, the first channel signal input is performed only for one unit interval from the irradiation of the optical trigger pulse 401-6 to the irradiation of the optical trigger pulse 402-6. The signal of the terminal 401-5 can be cut out and output to the signal output line 411.

  This light trigger pulse irradiation occurs in the same manner in the next third channel block 403 with a time offset of one unit interval, and the signal at the second channel signal input terminal 402-5 is sent to the signal output line 411 only for one unit interval. Is output. Such an operation is repeated, and the signal of each channel signal input terminal is cut out at every unit interval to realize parallel-serial conversion.

  FIG. 4 shows a configuration in which the differential trigger type parallel-serial conversion circuit shown in FIG. 3 is a differential input type. The first channel block 501 includes an MSM-PD 501-1, a capacitor 501-2, HEMTs 501-3, 501-4, and 501-11, resistors 501-7 to 501-10, and 501-12 to 501-14. It has. The second channel block 502 includes an MSM-PD 502-1, a capacitor 502-2, HEMTs 502-3, 502-4, 502-11, resistors 502-7 to 502-10, 502-12 to 502-14. It has. The same applies to other channel blocks.

  In the configuration shown in FIG. 4, the circuit composed of the HEMT 501-11 and the resistors 501-12 to 501-14 converts the signal input to the first channel differential signal input terminal 501-5 into a single-phase signal to convert the HEMT 501. -4. Similarly, a circuit including the HEMT 502-11 and the resistors 502-12 to 502-14 converts a signal input to the second channel differential signal input terminal 502-5 into a single-phase signal and inputs the signal to the HEMT 502-4. . The operation of the other configuration is the same as that of the differential trigger type parallel-serial conversion circuit shown in FIG.

  In the differential trigger type parallel / serial conversion circuit shown in FIGS. 3 and 4, irradiation of the optical trigger pulse shifted by one unit interval as described above is performed in the first channel block, the second channel block, the third channel block,. .. The operation of a loop in which the Nth channel block is performed in order, the optical trigger pulse is given to the Nth channel block, and then the optical trigger pulse is given again to the first channel block after one unit interval. Done.

  In order to irradiate the optical trigger pulse by sequentially shifting the time from the first channel block to the Nth channel block, an optical system as illustrated in FIG. 5 is necessary. FIG. 5 shows an example in which 16 channel blocks 401, 402, 403,..., 4016 (N = 16) are integrated on an OEIC (Opto-Electronic Integrated Circuit) 306. Yes. The optical system includes a 1:16 optical splitter 302 that splits the optical trigger pulse 301 into 16 branches, variable optical delay lines 303-1 to 303-16 for fine adjustment, and one unit interval from 0 unit interval to 15 unit intervals. Fixed optical delay lines 304-1 to 304-16 having shifted optical delay amounts and optical trigger pulses propagating through the fixed optical delay lines 304-1 to 304-16 are transmitted to the MSMs of the channel blocks 401 to 4016 on the OEIC 306. A 16-channel fiber array 305 that irradiates the PD. Reference numerals 307-1 to 307-16 in FIG. 5 denote optical fiber core wires.

JP 2004-88660 A JP 2012-004617 A

Kiyoto Takahata and 4 others, “Three Point Three Picoseconds Electrical Pulse Generation From a Discharge Based Metal Semiconductor Metal Photodetector (3.3 ps electrical pulse generation from a discharge- based metal-semiconductor-metal according to "Electronics Letters", I Triple E (IEEE), January 2005, Vol. 41, No. 1, pp. 38-40 R. Urata and four others, "An Optically Clocked Transistor Array for High Speed Asynchronous Label Swapping Forty Gigabit Perconcons and Beyond (An Optically Clocked Transistor Array for High-Speed Asynchronous Label Swapping: 40 Gb / s and Beyond ”, Journal of Lightwave Technology (JOURNAL OF LIGHTWAVE TECHNOLOGY), i-Triple (IEEE), March 2008, Volume 26 , No. 6, pp. 692-703 Yuji Ishikawa and five others, “A novel optically clocked transistor array using differential operation, for A differential optical clocked transistor array using differential operation for parallel to serial conversion parallel-to-serial conversion) ”, ECOC 2010

  In the optical trigger type OEIC, the unit interval during operation depends on the time interval of the optical trigger pulse. Therefore, in the case of an OEIC that operates to receive signals from other devices, it may be necessary to finely adjust the time interval of the optical trigger pulse in accordance with the bit rate of the received signal. In such a case, as shown in FIG. 5, the variable optical delay line 303-1 for fine adjustment is provided separately from the fixed optical delay lines 304-1 to 304-16 that give the optical trigger pulse a delay for each unit interval. ~ 303-16 was sometimes used. However, the variable optical delay line generally requires a mechanical movable part, and has a problem in reliability.

  The present invention has been made to solve the above-described problem, and provides an optical system for an optoelectronic integrated circuit capable of adjusting the delay amount of the optical trigger pulse without using a mechanical movable part. For the purpose.

  The present invention relates to an optoelectronic integrated circuit in which an N-channel (N is an integer of 2 or more) photo-trigger transistor circuit is arranged, and applies a photo-trigger pulse to a light receiving element of each photo-trigger transistor circuit at predetermined unit intervals. An optical system for an opto-electronic integrated circuit that irradiates with a time lag, wherein the intensity of each of a 1: N optical splitter that splits an optical trigger pulse into N branches and an optical trigger pulse that is split into N branches by the 1: N optical splitter. An individually adjustable light intensity modulation unit, and a frequency shift unit that individually shifts the frequency of each of the N optical trigger pulses whose intensities are adjusted by the light intensity modulation unit by a shift amount corresponding to the intensity. In addition, an optical delay is individually applied to each of the N optical trigger pulses frequency-shifted by the frequency shift unit by an amount corresponding to each frequency. A dispersion medium section, N fixed optical delay lines each having an optical delay amount that sequentially increases by the unit interval and connected to N output terminals of the dispersion medium section one by one; N optical fiber core wires connected one by one to the output end of the fixed optical delay line are bundled and arranged from the output end of these optical fiber core wires to the corresponding optical trigger type transistor circuit on the optoelectronic integrated circuit. And an N-channel optical fiber coupling system for irradiating a pulse.

In one configuration example of the optical system for an optoelectronic integrated circuit according to the present invention, the dispersion medium section applies an optical delay smaller than the unit interval to each of the N optical trigger pulses. Is.
Also, one configuration example of the optical system for the optoelectronic integrated circuit of the present invention is characterized in that the N fixed optical delay lines and the N-channel optical fiber coupling system are integrally formed by a silica-based waveguide. To do.
In one configuration example of the optical system for an optoelectronic integrated circuit according to the present invention, the frequency shift unit is composed of N nonlinear effect optical fibers provided for each channel.
In one configuration example of the optical system for an optoelectronic integrated circuit according to the present invention, the dispersion medium section demultiplexes each of the N optical trigger pulses frequency-shifted by the frequency shift section according to the frequency. A plurality of first arrayed-waveguide-type diffraction gratings, and a plurality of first arrayed-waveguide-type diffraction gratings connected to the output terminals of the demultiplexing destinations of the first arrayed-waveguide diffraction gratings and having different optical delay amounts for each demultiplexing destination It is characterized by comprising a fixed optical delay line and N second arrayed waveguide gratings that multiplex the output light of this fixed optical delay line for each channel.

  According to the present invention, by providing the optical intensity modulation unit, the frequency shift unit, and the dispersion medium unit in the optical system for the optoelectronic integrated circuit, an arbitrary delay amount can be individually given to the N optical trigger pulses. It becomes possible. And in this invention, reliability can be improved by removing a mechanical movable part from an optical system.

  In the present invention, the optical medium size can be reduced by providing each of the N optical trigger pulses with an optical delay smaller than the unit interval in the dispersion medium portion.

  In the present invention, the size of the optical system can be reduced by integrally forming the N fixed optical delay lines and the N-channel optical fiber coupling system with the silica-based waveguide.

It is a schematic diagram which shows the structure of the optical system of this invention. It is a schematic diagram which shows the structure of the optical system which concerns on embodiment of this invention. It is a circuit diagram which shows the structure of the conventional differential trigger system parallel serial conversion circuit. It is a circuit diagram which shows the structure of the conventional differential input type | mold differential trigger system parallel serial conversion circuit. It is a schematic diagram which shows the structure of the conventional optical system.

[Principle of the Invention]
FIG. 1 is a schematic diagram showing the configuration of the optical system of the present invention. The optical system of the present invention includes a 1: N optical splitter 102 that splits the optical trigger pulse 101 into N branches (N is an integer of 2 or more), a light intensity modulation unit 103, a frequency shift unit 104, a dispersion medium unit 105, It is composed of N fixed optical delay lines 106-1 to 106-N and an N-channel optical fiber coupling system 107.

  The optical trigger pulse 101 is input to one input terminal of the 1: N optical splitter 102 and is branched N by the 1: N optical splitter 102. The N-branched optical trigger pulses are output from N output terminals of the 1: N optical splitter 102, respectively. A light intensity modulator 103 is connected to N output terminals of the 1: N optical splitter 102.

The light intensity modulator 103 can individually adjust the intensity of each of the optical trigger pulses branched by the 1: N optical splitter 102.
The frequency shift unit 104 individually shifts the frequency (wavelength) of each of the N optical trigger pulses whose intensities are adjusted by the light intensity modulation unit 103 by a shift amount corresponding to each light intensity.

  The dispersion medium unit 105 individually gives an optical delay to each of the N optical trigger pulses frequency-shifted by the frequency shift unit 104 by an amount corresponding to each frequency. Fixed optical delay lines 106-1 to 106-N are connected to N output terminals of the dispersion medium unit 105.

  With respect to the fixed optical delay lines 106-1 to 106-N, when the optical delay amount of the fixed optical delay line 106-1 is used as a reference (0 unit interval), the optical delay amount of the fixed optical delay line 106-2 is fixed optical delay. One unit interval is increased when viewed from the line 106-1, the optical delay amount of the fixed optical delay line 106-3 is increased by two unit intervals when viewed from the fixed optical delay line 106-1, and the last fixed optical delay line 106-N is increased. The optical delay amount increases sequentially by one unit interval such that the optical delay amount increases by (N-1) unit intervals when viewed from the fixed optical delay line 106-1.

  The N-channel optical fiber coupling system 107 is a bundle of N optical fiber core wires 109-1 to 109-N arranged in a row. The output ends of the fixed optical delay lines 106-1 to 106-N are connected to the input ends of the N optical fiber core lines 109-1 to 109-N of the N-channel optical fiber coupling system 107.

An N-channel photo-trigger transistor circuit is integrated on the OEIC 108 to which the optical system of the present invention emits a photo-trigger pulse. Examples of the optical trigger transistor circuit include the channel blocks 401 to 40N and 501 to 50N described with reference to FIGS. These channel blocks constitute a differential trigger parallel / serial conversion circuit as a whole.
The N optical trigger pulses emitted from the N-channel optical fiber coupling system 107 are irradiated to the light receiving elements (MSM-PD in the examples of FIGS. 3 and 4) of the corresponding channel block.

  In the present invention, the frequency shift amount of N optical trigger pulses in the frequency shift unit 104 is determined by the intensity of each optical trigger pulse, and the delay amount corresponding to each frequency in the dispersion medium unit 105 is N optical triggers. Since it is given to the pulse, it is possible to individually give an arbitrary delay amount to the N optical trigger pulses by individually adjusting the intensity of the N optical trigger pulses by the light intensity modulation unit 103. In the present invention, the reliability can be improved by eliminating the mechanical movable part from the optical system for OEIC.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a schematic diagram showing the configuration of the optical system according to the embodiment of the present invention. The optical system of the present embodiment includes a 1:16 optical splitter 202, a light intensity modulation unit 203, a frequency shift unit 204, a dispersion medium unit 205, and 16 fixed optical delay lines 206-1 to 206-16. And a 16-channel optical fiber coupling system 207. This embodiment shows a case where N = 16 in the configuration of the OEIC and the optical system shown in FIG.

  As in FIG. 1, a 16-channel photo-trigger transistor circuit is integrated on the OEIC 208. Examples of the optical trigger transistor circuit include the channel blocks 401 to 40N and 501 to 50N described with reference to FIGS. Each channel block 401 to 4016 (or 501 to 5016) mounted on the OEIC 208 needs to be irradiated with the optical trigger pulse 201 while being shifted by one unit interval in time, and 16 units are applied to each channel block. It is necessary to irradiate the optical trigger pulse 201 at an interval period. Accordingly, the first channel block is irradiated with the optical trigger pulse 201 one unit interval after the sixteenth channel block is irradiated with the optical trigger pulse 201.

  In this way, in order to irradiate the optical trigger pulse 201 while shifting the time sequentially from the first channel block to the 16th channel block, as with the fixed optical delay lines 106-1 to 106-N in FIG. It is only necessary to provide 16 fixed optical delay lines 206-1 to 206-16 having an optical delay amount that sequentially increases by unit interval. The optical path lengths of the fixed optical delay lines 206-1 to 206-16 are set according to the respective optical delay amounts.

In the present embodiment, adjustment of the delay amount of about one-tenth unit interval order requires a physical movable part in the previous stage of the fixed optical delay lines 206-1 to 206-16. Realize without.
As in FIG. 1, the optical trigger pulse 201 is branched into 16 by the 1:16 optical splitter 202. A light intensity modulation unit 203 is connected to 16 output ends of the 1:16 optical splitter 202.

  The light intensity modulation unit 203 includes 16 erbium-doped fiber amplifiers (EDFAs) 209-1 to 209-16 that receive 16 optical trigger pulses branched by the 1:16 optical splitter 202. , And wavelength filters 210-1 to 210-16 that receive the output light of the EDFAs 209-1 to 209-16.

  The EDFAs 209-1 to 209-16 can control the gain of signal light (optical trigger pulse) by individually adjusting the intensity of excitation light input to each EDFA 209-1 to 209-16, for example. : The intensity of each of the 16 optical trigger pulses input from the 16 optical splitter 202 can be individually adjusted.

  The output light from the EDFAs 209-1 to 209-16 includes spontaneous emission amplified light having a wide spectral width. In order to eliminate such noise light, narrowband wavelength filters 210-1 to 210-16 are provided at the outputs of the EDFAs 209-1 to 209-16, and only the optical trigger pulse of a predetermined frequency is provided in the wavelength filter 210. -1 to 210-16 are transmitted.

  Next, the frequency shift unit 204 has 16 non-linear effect optical fibers (HNLF) 211 that individually shift the frequencies of the 16 optical trigger pulses whose intensities are adjusted by the light intensity modulation unit 203. -1 to 211-16. The frequency of the optical trigger pulse input to each of the HNLFs 211-1 to 211-16 changes due to a phenomenon called soliton self-frequency shift (SSFS). The amount of frequency shift at this time is determined by the intensity of each optical trigger pulse.

  The dispersion medium unit 205 includes 16 arrayed-waveguide grating (AWG) that demultiplexes each of the 16 optical trigger pulses frequency-shifted by the frequency shift unit 204 according to the frequency. 212-1 to 212-16 and a plurality of demultiplexing destination output terminals of AWGs 212-1 to 212-16 and having different optical delay amounts for each demultiplexing destination (in this embodiment, per channel) 4) fixed optical delay lines 213-1-1 to 213-16-4 and 16 AWGs 214 that multiplex the output light of the fixed optical delay lines 213-1-1 to 213-16-4 for each channel. -1 to 214-16.

  The fixed optical delay lines 213-1-1 to 213-16-4 have an optical delay amount that increases or decreases sequentially for each channel by an amount smaller than the unit interval (for example, about 1/10 unit interval order). The fixed optical delay lines 213-1-1 to 213-16-4 for each channel have optical path lengths set according to the respective optical delay amounts. In this embodiment, since four fixed optical delay lines 213-1-1 to 213-16-4 are provided per channel, the light of each channel demultiplexed by the AWGs 212-1 to 212-16 is provided. Each of the trigger pulses is given any one of the four delay levels. The maximum value of these optical delay amounts is set to be less than one unit interval.

An optical trigger pulse having a desired delay amount is obtained by combining the output lights of the fixed optical delay lines 213-1-1 to 213-16-4 for each channel by the AWGs 214-1 to 214-16. Can do.
Thus, the dispersion medium unit 205 plays a role of acting as a medium having discrete dispersion characteristics as a whole.

Fixed optical delay lines 206-1 to 206-16 are connected to output terminals of the AWGs 214-1 to 214-16, respectively.
As in FIG. 1, the 16-channel optical fiber coupling system 207 is a bundle of 16 optical fiber core wires 215-1 to 215-16 arranged in one row. The output ends of the fixed optical delay lines 206-1 to 206-16 are connected to the input ends of the optical fiber core lines 215-1 to 215-16.

  The 16 optical trigger pulses emitted from the 16-channel optical fiber coupling system 207 are applied to the light receiving elements (MSM-PD in the examples of FIGS. 3 and 4) of the corresponding channel block on the OEIC 208.

  In the present embodiment, it is possible to finely adjust the time interval of the optical trigger pulse by setting the adjustment width of the optical delay amount in the dispersion medium unit 205 to be less than one unit interval, and the time interval of the optical trigger pulse can be adjusted. Since it is possible to reduce the intensity modulation range of the light intensity modulation unit 203 necessary for adjustment, shorten the nonlinear effect optical fiber used for the frequency shift unit 204, and reduce the scale of the dispersion medium unit 205, It becomes possible to reduce the size of the optical system.

  In this embodiment, the example in which the optical trigger type transistor circuit integrated in the OEIC 208 is 16 channels (16 pieces) has been described. However, the same effect as this embodiment can be obtained even in the configuration of other channels. Needless to say.

  In this embodiment, an EDFA is adopted as a main intensity modulation element of the light intensity modulation unit 203. Instead of the EDFA, an amplification element such as SOA (Semiconductor Optical Amplifier) or an attenuation element such as VOA (Variable Optical Attenuator) is used. May be used.

  In this embodiment, the change in the shape of the optical trigger pulse due to the HNLF of the frequency shift unit 204 is not a problem. However, when the change in the shape of the optical trigger pulse adversely affects the operation of the OEIC 208 in the subsequent stage, the frequency shift unit Compensation is possible by providing waveform shaping means after 204.

  In this embodiment, HNLF is adopted as the nonlinear effect optical fiber of the frequency shift unit 204. However, if the optical fiber has a practical nonlinear effect, it is not necessary to be HNLF. Instead of HNLF, DSF (Dispersion Shifted) is used. Fiber: dispersion-shifted fiber) may be used.

  In the present embodiment, the dispersion medium unit 205 is constituted by an AWG and a fixed optical delay line, but the same effect can be obtained even if a spatial engineering system using a grating or the like or a simple optical fiber is used.

  In the present embodiment, the intensity of the light trigger pulse of each channel is individually adjusted by the light intensity modulation unit 203, so that the intensity of the light trigger pulse of each channel varies, but the light intensity is integrated in the OEIC 208. When the optical trigger type transistor circuit is a circuit as shown in FIG. 3 or FIG. 4, since the circuit has optical power fluctuation tolerance, the effect can be obtained without any particular problem.

  In this embodiment, the fixed optical delay lines 206-1 to 206-16 and the 16-channel optical fiber coupling system 207 are provided separately, but the fixed optical delay lines 206-1 to 206-16 and the 16-channel optical fiber are provided. The coupling system 207 may be integrally formed with a quartz-based waveguide. Thereby, the size of the optical system can be reduced.

  1 and 2 show an example in which the optical trigger type transistor circuits are arranged in one row (one dimension) on the OEIC, but the configuration of the optical fiber coupling system according to the arrangement of the optical trigger type transistor circuits. For example, the present invention can be applied to a configuration in which optical trigger transistor circuits are two-dimensionally arranged on an OEIC.

  The present invention can be applied to an optical system technique for irradiating an optoelectronic integrated circuit with an optical trigger pulse.

  101, 201 ... optical trigger pulse, 102 ... 1: N optical splitter, 103, 203 ... light intensity modulation unit, 104, 204 ... frequency shift unit, 105, 205 ... dispersion medium unit, 106-1 to 106-N, 206 -1 to 206-16, 213-1-1 to 213-16-4 ... fixed optical delay line, 107 ... N-channel optical fiber coupling system, 108, 208 ... optoelectronic integrated circuit, 109-1 to 109-N, 215 -1-215-16 ... optical fiber core wire, 202 ... 1:16 optical splitter, 207 ... 16-channel optical fiber coupling system, 209-1 to 209-16 ... erbium-doped fiber optical amplifiers, 210-1 to 210-16 ... Wavelength filter, 211-1 to 211-16 ... nonlinear effect optical fiber, 212-1 to 212-16, 214-1 to 214-16 ... array waveguide Diffraction grating, 401~40N, 501~50N ... channel block, 401-1,402-1,501-1,502-1 ... MSM-PD.

The present invention relates to an optoelectronic integrated circuit in which N-channel (N is an integer greater than or equal to 2) photo-trigger transistor circuits are arranged. An optical system for an opto-electronic integrated circuit that irradiates with a time lag, wherein the intensity of each of a 1: N optical splitter that splits an optical trigger pulse into N branches and an optical trigger pulse that is split into N branches by the 1: N optical splitter. , An optical intensity modulation unit that can be individually adjusted to give an arbitrary delay amount to each of these optical trigger pulses, and the frequency of each of the N optical trigger pulses whose intensity is adjusted by the optical intensity modulation unit, A frequency shift unit that individually shifts the shift amount corresponding to each intensity, and N optical trigger pulses that are frequency-shifted by the frequency shift unit. Each of which has a dispersion medium section that individually gives an optical delay by an amount corresponding to each frequency, and an optical delay amount that sequentially increases by the unit interval, one at each of N output terminals of the dispersion medium section. N fixed optical delay lines connected one by one and N optical fiber cores connected one by one to the output ends of the N fixed optical delay lines are bundled and arranged, and the output ends of these optical fiber core lines To an N-channel optical fiber coupling system for irradiating a corresponding optical trigger type transistor circuit on the optoelectronic integrated circuit with an optical trigger pulse.

Claims (5)

For an optoelectronic integrated circuit in which an N-channel (N is an integer of 2 or more) photo-trigger transistor circuit is arranged, the photo-trigger pulse is shifted to the light-receiving element of each photo-trigger transistor circuit by a predetermined unit interval. An optical system for irradiating optoelectronic integrated circuits,
A 1: N optical splitter that splits the optical trigger pulse into N branches;
A light intensity modulator capable of individually adjusting the intensity of each of the optical trigger pulses branched by the 1: N optical splitter;
A frequency shift unit that individually shifts the frequency of each of the N optical trigger pulses, the intensity of which is adjusted by the light intensity modulation unit, by a shift amount according to the intensity;
A dispersion medium part that individually gives an optical delay to each of the N optical trigger pulses frequency-shifted by the frequency shift part by an amount corresponding to each frequency;
N fixed optical delay lines each having an optical delay amount that sequentially increases by the unit interval and connected one by one to the N output ends of the dispersion medium section;
N optical fiber core wires connected one by one to the output ends of the N fixed optical delay lines are arranged in a bundle, and the corresponding optical trigger transistors on the optoelectronic integrated circuit are arranged from the output ends of the optical fiber core wires. An optical system for an optoelectronic integrated circuit, comprising: an N-channel optical fiber coupling system for irradiating the circuit with an optical trigger pulse. The optical system for an optoelectronic integrated circuit according to claim 1,
The optical system for an optoelectronic integrated circuit, wherein the dispersion medium section gives an optical delay of an amount smaller than the unit interval to each of the N optical trigger pulses. The optical system for an optoelectronic integrated circuit according to claim 1 or 2,
An optical system for an optoelectronic integrated circuit, wherein the N fixed optical delay lines and the N-channel optical fiber coupling system are integrally formed by a silica-based waveguide. The optical system for an optoelectronic integrated circuit according to any one of claims 1 to 3,
The optical system for an optoelectronic integrated circuit, wherein the frequency shift unit includes N nonlinear effect optical fibers provided for each channel. The optical system for an optoelectronic integrated circuit according to any one of claims 1 to 4,
The dispersion medium section includes N first arrayed waveguide gratings for demultiplexing each of the N optical trigger pulses frequency-shifted by the frequency shift section according to the frequency, and each first A plurality of fixed optical delay lines connected to the output end of the demultiplexing destination of the arrayed waveguide type diffraction grating and having different optical delay amounts for each demultiplexing destination, and the output light of this fixed optical delay line for each channel An optical system for an optoelectronic integrated circuit comprising N second arrayed waveguide type diffraction gratings for multiplexing.