CN202870424U - Electro-optical modulation system and electro-optical switch or optical attenuator comprising the same - Google Patents
Electro-optical modulation system and electro-optical switch or optical attenuator comprising the same Download PDFInfo
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- CN202870424U CN202870424U CN201220458592.8U CN201220458592U CN202870424U CN 202870424 U CN202870424 U CN 202870424U CN 201220458592 U CN201220458592 U CN 201220458592U CN 202870424 U CN202870424 U CN 202870424U
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Abstract
The utility model discloses an electro-optical modulation system and an electro-optical switch or an optical attenuator comprising the electro-optical modulation system. The electro-optical modulation system comprises an electro-optical PIN diode waveguide and a pair of mode converters. The electro-optical PIN diode waveguide is composed of a ridge waveguide. A highly dense P type doping zone and a highly dense N type doping zone are respectively arranged at two sides of a flat plate zone of the electro-optical PIN diode waveguide. The height of the flat plate zone of the ridge waveguide is shorter than that of a ridge of the ridge waveguide by a half. The width of the ridge of the ridge waveguide is approximate to the total height of the ridge waveguide. Most energy of a dominant mode of waveguide transmission is limited in a waveguide core zone. The electro-optical switch or the optical attenuator sequentially comprises an input Y branch coupler, a pair of electro-optical modulation systems and an output Y branch coupler. According to the electro-optical modulation system and the electro-optical switch or the optical attenuator comprising the electro-optical modulation system, efficiency in filling charge carriers is improved, total power consumption of elements is reduced and extinction ratio is high.
Description
Technical field
The utility model relates to a kind of integrated optoelectronic device, especially a kind of electro-optic modulation system and by its electrooptical switching that consists of or optical attenuator.
Background technology
In the PIN diode based on charge injection, free carrier concentration is modulated in the concentration of PIN diode intrinsic region, can cause the variation of semiconductor material refractive index and absorption coefficient (refractive index imaginary part).
Document and patent that many silicon-based electro-optical modulators based on said structure and electrooptical switching have been arranged at present.The greatest problem of this technology is exactly that charge injection efficient is too low.Particularly when PIN diode was driven by forward voltage, the injection of the how sub-electron pair intrinsic region of the how sub-hole of P type doped region and N-type doped region was subject to the restriction of P type doped region and N-type doped region doping content, and this becomes the restrictive condition of carrier injection.If want to inject more charge carrier to the intrinsic region, must improve the doping content of P type doped region and N-type doped region, and this can increase light loss.
And on the other hand, basically be directly proportional with charge carrier (in other words electric charge) sum that injects waveguide core layer (being the intrinsic region of PIN diode haply) based on the power consumption of the device of this technology.Simultaneously, the size of waveguide core layer (approximately several microns) need to satisfy the requirement that device and optical fiber have good coupling efficiency, and waveguide has less polarization correlated.The high-index-contrast characteristic of SOI waveguide is so that size large single mode waveguide in core district laterally a little less than the restriction.When realizing such structure with ridge waveguide, wave guide ridge can not be too high.And this can cause two problems:
1) because the horizontal restriction of waveguide is very weak, in order to reduce the light consume, the P type doped region of PIN structure and N-type doped region must be enough away from the core districts, and this can increase the length of intrinsic region.Simultaneously, in order to keep certain carrier concentration, needed total electrical charge will increase, thereby increases power consumption.
2) the ridge height is lower, dull and stereotyped district is just relatively thick, means that charge carrier can be more easily by the hole-recombination of dull and stereotyped district with P type doped region, and charge carrier is shorter in the life-span of intrinsic region, so it is larger to keep the intrinsic region needed electric current of certain carrier concentration, has increased power consumption.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of electro-optic modulation system and by its electrooptical switching that consists of or optical attenuator, solve the not high problem of Carrier Injection Efficiency in the prior art, reduce the device total power consumption, and have High Extinction Ratio.
The utility model is achieved by following technical proposals:
A kind of electro-optic modulation system, comprise the waveguide of electric light PIN diode and a pair of mode converter, the waveguide of described electric light PIN diode consists of by implementing doping process at ridge waveguide, described ridge waveguide comprises wave guide ridge and dull and stereotyped district, and the both sides in its dull and stereotyped district are respectively P type doped region and N-type doped region, and described P type doped region is that acceptor ion mixes, described N-type doped region is that donor ion mixes, described a pair of mode converter comprises input pattern transducer and output mode transducer, wherein
Described ridge waveguide is made of semiconductor material, and its waveguide core district is the intrinsic region; The height in described dull and stereotyped district can be less than half of described wave guide ridge height, make described ridge waveguide have the contrast of strong refraction rate, can be multimode waveguide, in certain embodiments, the height in the flat board district of the ridge waveguide of described electric light PIN diode waveguide is as far as possible little, can be as small as the technique permissible value that guarantees that described dull and stereotyped district is not worn quarter; Described P type doped region and N-type doped region are near the waveguide core district of described ridge waveguide, be high-concentration dopant, but only be limited to described dull and stereotyped district and do not enter described waveguide core district, when described PIN diode was driven by forward current, described two doped regions were as the injection source of charge carrier; The width of described wave guide ridge is close with the overall height of described ridge waveguide, and most energy distribution of the main mould of waveguide conduction are limited in its waveguide core district fully; The input pattern transducer of described mode converter connects the input end of described electric light PIN diode waveguide, the basic mode of input single mode waveguide all is converted to the basic mode of described electric light PIN diode waveguide; The output mode transducer of described mode converter connects the output terminal of described electric light PIN diode waveguide, the basic mode of described electric light PIN diode waveguide all is converted to the basic mode of output single mode waveguide.Described fulgurite PIN diode waveguide top has additional electrodes, described P type doped region and N-type doped region to comprise that respectively is positioned at the high heavily doped region of described additional electrodes below doping content.
A kind of electrooptical switching or optical attenuator that is consisted of by above-mentioned electro-optic modulation system, comprise successively one as the input Y branch coupler of input optical branching device from being input to output, a pair of described electro-optic modulation system and the output Y branch coupler as output combiner device; Described a pair of electro-optic modulation system comprises the first electro-optic modulation system and the second electro-optic modulation system; Described input Y branch coupler is made of single mode waveguide, comprise single waveguide of input, the first output branch waveguide and the second output branch waveguide, described the first output branch waveguide connects the input pattern transducer of described the first electro-optic modulation system, and described the second output branch waveguide connects the input pattern transducer of described the second electro-optic modulation system; Described output Y branch coupler is made of single mode waveguide, comprise the first input branch-waveguide, the second input branch-waveguide and single waveguide of output, described the first input branch-waveguide connects the output mode transducer of described the first electro-optic modulation system, and described the second input branch-waveguide connects the output mode transducer of described the second electro-optic modulation system; Input pattern transducer in the described a pair of electro-optic modulation system all is converted to the basic mode of described input Y branch coupler the basic mode of the electric light PIN diode waveguide in the described a pair of electro-optic modulation system, and the output mode transducer in the described a pair of electro-optic modulation system changes into the basic mode of described electric light PIN diode waveguide the basic mode of described output Y branch coupler; Electric light PIN diode waveguide in the described a pair of electro-optic modulation system can be driven by a pair of additional electrodes respectively.
Above-mentioned electrooptical switching or optical attenuator, wherein, the single mode waveguide that consists of described input, output Y branch coupler comprises one section curved waveguide part that guided mode a little less than the high order is had high loss.Electric light PIN diode waveguide in described the first electro-optic modulation system has carrier injection, and described the second electro-optic modulation system is not or less carrier injection arranged; The luminous power of the first output branch waveguide output of described input Y branch coupler is higher than the luminous power of its second output branch waveguide output, and this luminous power difference equals the additional light loss that the electric light PIN diode waveguide in described the first electro-optic modulation system produces.The starting point of the first output branch waveguide of described input Y branch coupler is positioned at starting point the place ahead of its second output branch waveguide at optical propagation direction.Between the first output branch waveguide of described input Y branch coupler and single waveguide of its input perpendicular to the interval on the optical propagation direction, less than between its second output branch waveguide and single waveguide of its input perpendicular to the interval on the optical propagation direction.
Technical solutions of the utility model have following beneficial effect:
1, improves Carrier Injection Efficiency, reduction power consumption
Wave guide ridge district height in the utility model structure is far above the wave guide ridge district height of existing structure, and the charge carrier of injection can gather in whole ridge district, and can only leave the ridge district by the flat board district of thinner thickness.Because few son life-span in silicon materials is very long, so after N-type doped region injected electrons enters the ridge district, the slype that provides by the flat board district enters P type doped region and very little with the ratio of the how sub-hole-recombination of P type doped region, has increased the life-span of charge carrier in the intrinsic region.In addition, because the flat board district thickness of the utility model structure is less, so it is less to keep the intrinsic region needed electric current of certain carrier concentration.Simultaneously, dull and stereotyped district thickness is less, and the ridge height of waveguide is higher, increased horizontal restriction, the main mould of ridge waveguide mainly is limited in the wave guide ridge district, dull and stereotyped distinguish extending transversely very little of waveguide, can not cause owing to the high-dopant concentration of P, N-type doped region that therefore very large light attracts loss.The spacing in doped region and ridge district also can be dwindled.Therefore, this structure can improve the Carrier Injection Efficiency of intrinsic region, the overall power consumption of reduction device effectively.
2, High Extinction Ratio
In the utility model structure, realize inhomogeneous light splitting by single waveguide of input of adjustment input Y branch coupler and the relative position of two output branch waveguides, so that luminous power is used for the additional light loss that this electric light PIN diode waveguide of compensation causes owing to carrier injection a little more than other one in input Y branch coupler and that input branch-waveguide that electric light PIN diode waveguide that the active waveguide district powers up links to each other.Like this can be so that the luminous power during two output branch waveguides that the light beam in the waveguide of two electric light PIN diode enters output Y branch coupler be identical.When 180 degree phase differential was arranged between the light signal in two the electric light PIN diode waveguide of active waveguide district, two bundle output light positives were cancelled out each other well, and the output terminal luminous power of output Y branch coupler is zero.
Description of drawings
Fig. 1 is the electrooptical switching that is made of the disclosed electro-optic modulation system of the utility model or the schematic diagram of optical attenuator.
Fig. 2 (a) is A-A schematic cross-section among Fig. 1, also is the schematic cross-section of the electric light PIN diode waveguide of the disclosed electro-optic modulation system of the utility model simultaneously.
Fig. 2 (b) is B-B schematic cross-section among Fig. 1, also is the schematic cross-section of the input pattern transducer of the disclosed electro-optic modulation system of the utility model simultaneously.
Fig. 3 is the structural representation of the input Y branch coupler of the open electrooptical switching of the utility model or optical attenuator.
Embodiment
Also by reference to the accompanying drawings the utility model is described in detail below by specific embodiment:
The utility model provides a kind of electric light PIN diode waveguide of high injection efficiency and electro-optic modulation system of a pair of mode converter of comprising, and by this electro-optic modulation system electrooptical switching that consist of, single mode operation or optical attenuator.
Fig. 1 has provided the electrooptical switching that is made of the disclosed electro-optic modulation system of the utility model or the schematic diagram of optical attenuator.Described electrooptical switching or optical attenuator are a kind of waveguide devices of semiconductor material.The main optical waveguide layer of waveguide is semiconductor material, for example silicon.As shown in Figure 1, described electrooptical switching or optical attenuation comprise an input Y branch coupler successively by being input to output, a pair of electro-optic modulation system and an output Y branch coupler, namely input Y branch coupler 9, a pair of input pattern transducer 7, one section active waveguide district 6, a pair of output mode transducer 8, output Y branch coupler 10.Input Y branch coupler 9 and output Y branch coupler 10 are made of single mode waveguide, and both branch-waveguides all comprise one section curved waveguide part that guided mode a little less than the high order is had high loss.Active waveguide district 6 is made of the waveguide of two parallel electric light PIN diode, and this two parallel electric light PIN diode waveguide can be considered as two arms in active waveguide district 6.Two input pattern transducers 7 connect respectively an end of two arms of active wave guide zone 6, and the other end of two arms in active waveguide district 6 connects respectively an output mode transducer 8.Here, the upper arm in active waveguide district 6 has consisted of the first electro-optic modulation system with a pair of mode converter that is connected respectively its input end and output terminal, and the underarm in active waveguide district 6 has consisted of the second electro-optic modulation system with a pair of mode converter that is connected respectively its input end and output terminal.
Input Y branch coupler 9 comprises input single waveguide, the first output branch waveguide and the second output branch waveguide.The first output branch waveguide of input Y branch coupler 9 connects an end of the input pattern transducer of (electro-optic modulation system that comprises the upper arm of active wave guide zone 6) in the first electro-optic modulation system, and its second output branch waveguide connects the input pattern transducer of (electro-optic modulation system that comprises the underarm of active wave guide zone 6) in the second electro-optic modulation system.Output Y branch coupler 10 comprises the first input branch-waveguide, the second input branch-waveguide and single waveguide of output.The first input branch-waveguide of output Y branch coupler 10 connects the output mode transducer of (electro-optic modulation system that comprises the upper arm of active wave guide zone 6) in the first electro-optic modulation system, and its second input branch-waveguide connects the output mode transducer of (electro-optic modulation system that comprises the underarm of active wave guide zone 6) in the second electro-optic modulation system.
Input Y branch coupler 9 is input optical branching devices that incident light is divided into two, the basic mode that a pair of input pattern transducer 7 will be inputted the single mode waveguide of Y branch coupler 9 all converts the basic mode for two electric light PIN diode waveguide in active waveguide district 6 to, a pair of output mode transducer 8 all is converted to the basic mode of two electric light PIN diode waveguide in active waveguide district 6 basic mode of the single mode waveguide of output Y branch coupler 10 again, and output Y branch coupler 10 reconsolidates into one to two output light as output combiner device.As shown in Figure 1, the branch-waveguide of input Y branch coupler 9 and output Y branch coupler 10 also is connected with one section curved waveguide part that guided mode a little less than the high order is had high loss.
Fig. 2 (a) is A-A schematic cross-section among Fig. 1, also is simultaneously the schematic cross-section of the electric light PIN diode waveguide of the open electro-optic modulation system of the utility model.Shown in Fig. 2 (a), the waveguide of the disclosed electric light PIN diode of the utility model be one based on the PIN diode of ridge waveguide, this ridge waveguide comprises wave guide ridge and dull and stereotyped district, and the both sides in its dull and stereotyped district are respectively P type doped region and N-type doped region, and described P type doped region is that acceptor ion mixes.The maximum of the ridge waveguide in ridge waveguide and the aforementioned reference is distinguished and is herein, and with respect to same waveguide overall height, the wide single mode SOI waveguide of ridge, its ridge height is higher.In the ridge waveguide of this structure, the height h1 in dull and stereotyped district should be as far as possible little, little technique permissible value to guaranteeing that dull and stereotyped district is not worn quarter.Therefore, the height h1 in dull and stereotyped district is much smaller than the overall height (h1+h2) of ridge waveguide, and in certain embodiments, h1 is less than or equal to h2/2.The waveguide core district of electric light PIN diode waveguide is the intrinsic region, i.e. the silicon materials district of wave guide ridge 1 and below thereof (unadulterated part in the ridge waveguide).P type doped region 2 is made of through the doping P-type semiconductor the left side in flat board district, and N-type doped region 4 is made of through the doped N-type semiconductor the right side in flat board district, and vice versa.According to the requirement of device serviceability, an interval a1 is arranged between the edge in P, N-type doped region 2,4 borders and ridge district.Simultaneously, polarization correlated in order to reduce, the wide w3 of the ridge of wave guide ridge 1 should be close with ridge waveguide overall height (h1+h2).There is an additional electrodes 3 P type doped region 2 tops, and there is an additional electrodes 5 N-type doped region 4 tops, can guarantee Ohmic contact by heavy doping is carried out in the zone of additional electrodes 3 and 5 belows.
In the disclosed electro-optic modulation system of the utility model, because the height h1 (being the height of P, N-type doped region) in the flat board district of electric light PIN diode waveguide much smaller than the overall height h1+h2 of ridge waveguide, stores the height of the intrinsic region of free carrier (electronics and hole) when namely electric current injects; So keep the needed electric current of the certain carrier concentration in intrinsic region much smaller than the relevant work electric current of electric light PIN diode of the prior art.Simultaneously, because the high h2 of ridge is higher, most energy distribution of the main mould of ridge waveguide are limited in the waveguide core district fully, be in the wave guide ridge 1, so high-dopant concentration of P type doped region 2 and N-type doped region 4, can not cause very large Waveguide absorption loss, simultaneously interval a1 can very little (until the light loss that causes thus be can not ignore).Because the high carrier concentration that the doping content of P type doped region 2 and N-type doped region 4 is intrinsic regions can be kept, the doping of P type doped region 2 and N-type doped region 4 can be regarded the carrier injection source as.When the carrier concentration of intrinsic region is identical with doping content (being the concentration of P type doped region 2 and N-type doped region 4 majority carriers), PIN diode can enter the electrode injection pattern, charge carrier this moment (electronics) need to be filled the whole silicon materials zone between additional electrodes 3,5, thereby so that the total power consumption of device sharply rise.
Wave guide ridge district height in the utility model structure can improve its magnitude of the stored charge effectively far above the wave guide ridge district height of existing structure, improves Carrier Injection Efficiency.This is because injected carrier can gather in whole ridge district, but can only leave the ridge district by the narrow passage that P, the flat board district at N-type doped region place provide.Especially after N-type doped region injected electrons enters the ridge district, the unique mode that may leave the ridge district be by the slype that aforementioned dull and stereotyped district provides enter P type doped region and with the how sub-hole-recombination of P type doped region.Simultaneously, because the life-span very long (being generally Microsecond grade) in silicon materials of few son, the charge carrier of intrinsic region is compound, and to account for the ratio of charge carrier sum very little.The waveguide of the disclosed electric light PIN diode of the utility model is multimode waveguide; in actual applications; generally before it, adopt a mode converter; the single mode basic mode of waveguide conduction is converted into the multimode basic mode; guarantee that higher mode is not excited; adopt simultaneously a mode converter after it, the multimode basic mode that waveguide is conducted is converted to the single mode basic mode again.
The B-B cross section of Fig. 2 (b) has provided the structure of input pattern transducer 7.Shown in Fig. 2 (b), mode converter 7, the 8th, the structure of regeneration wave guide ridge 12 on wave guide ridge 11.Wave guide ridge 1 among wave guide ridge 11 and Fig. 2 (a) is same wave guide ridge.From the input end to the output terminal, the width of wave guide ridge 12 narrows down gradually.When the width w2 of wave guide ridge 12 changes to enough narrowly, most of luminous energy can be limited in the waveguide below the wave guide ridge 12, and namely the waveguide conduction mode changes into the basic mode of the multimode waveguide of electric light PIN diode waveguide.On the contrary, in output mode transducer 8 structures, from the input end to the output terminal, the wide variety trend of wave guide ridge 12 is opposite, when the width W 1 of wave guide ridge 12 changes to enough wide, most of luminous energy can enter in the wave guide ridge 12, and the waveguide conduction mode is gradually transformed into the basic mode of the single mode waveguide of output Y branch coupler 10.
Structure illustrated in figures 1 and 2 is applicable in the material system of high-index-contrast usually, for example SOI waveguide.In the section B-B of Fig. 2 (b), the 14th, the coating layer material of waveguide, monox normally in the SOI waveguiding structure; The 15th, core district material, silicon normally in the SOI waveguiding structure; The 13rd, the waveguide zone of ridge both sides; The 16th, as the buried regions monox of lower clad.
In order to produce High Extinction Ratio (device Output optical power under the cut-off duty approaches zero), suppose that output Y branch coupler 10 (output combiner device) is evenly to close bundle, so through the two-beam of two arms outputs in active waveguide district 6 enter output Y branch coupler 10 (output combiner device) luminous power before must be identical.But when injected carrier produced the phase place variation in the active waveguide district 6 that the waveguide of electric light PIN diode consists of, it can produce extra optical absorption loss.In order to make light output locate to cancel out each other and decay at output Y branch coupler 10 (output combiner device), it must be different that the phase place that two arms in active waveguide district 6 produce changes, but this can make the additional light absorption loss of two arms different.
The utility model provides another embodiment of input Y branch coupler, to address this problem.Fig. 3 is the structural representation of an embodiment of input Y branch coupler, note that the curved waveguide of inputting the Y branch coupler does not here partly show.As shown in Figure 3, input Y branch coupler 9 comprises single waveguide 90 of input and two output branch waveguides 91,92.Output branch waveguide 92 relative output branch waveguides 91 are placed a little backward and are realized light splitting heterogeneous.Because the time that output branch waveguide 92 begins to be coupled is later than output branch waveguide 91, the luminous power in the output branch waveguide 91 can be a little more than the luminous power in the output branch waveguide 92.The output branch waveguide 91 of input Y branch coupler 9 links to each other with the electric light PIN diode waveguide (upper arm) in active waveguide district 6 by the input pattern transducer, and input branch-waveguide 92 links to each other with another electric light PIN diode waveguide (underarm) in active waveguide district 6 by the input pattern transducer.Correspondingly, the upper arm electricity consumption signal driver in active waveguide district 6 is the intrinsic region of a large amount of carrier injections to the waveguide of this electric light PIN diode, and the other one arm (underarm) in active waveguide district 6 is carrier-free or less carrier injection then.The additional light loss that the upper arm in active waveguide district 6 produces is linearly related to because the phase place that carrier injection produces changes, and for example 180 degree phase places change.By adjusting output branch waveguide 91,92 front and back position, so that enter at the beginning the additional light loss that the luminous power difference value of the upper and lower arm in active waveguide district 6 equals the upper arm in aforementioned active waveguide district 6,6 luminous powers that finish to hold the light beam in two arms entering before exporting the Y branch coupler just can be identical in the active waveguide district like this.In other embodiments, can also adjust single waveguide 90 of input and two output branch waveguides 91, relative position between 92 is realized above-mentioned purpose, for example, between output branch waveguide 91 and single the waveguide 90 of input perpendicular to the interval on the optical propagation direction, less than between output branch waveguide 92 and single the waveguide 90 of input perpendicular to the interval on the optical propagation direction, perhaps do output branch waveguide 91 greater than output branch waveguide 92, thereby so that enter at the beginning the upper of source wave guide zone 6, the luminous power of underarm there are differences, and this difference value equals the upper arm in active waveguide district 6 owing to adding the additional light loss that electric signal causes.In addition, even underarm does not power up driving, also can make it and upper arm identical in passive situation by mixing and adding electrode.Doping that also can be by removing underarm and electrode are to reduce total passive light loss of device.
Above embodiment has been described in detail the utility model, and those skilled in the art can make the many variations example to the utility model according to the above description.Thereby some details in the embodiment should not consist of restriction of the present utility model, and the scope that the utility model will define with appended claims is as protection domain of the present utility model.
Claims (8)
1. electro-optic modulation system, comprise the waveguide of electric light PIN diode and a pair of mode converter, the waveguide of described electric light PIN diode consists of by implementing doping process at ridge waveguide, described ridge waveguide comprises wave guide ridge and dull and stereotyped district, and the both sides in its dull and stereotyped district are respectively P type doped region and N-type doped region, and described P type doped region is that acceptor ion mixes, described N-type doped region is that donor ion mixes, described a pair of mode converter comprises input pattern transducer and output mode transducer, it is characterized in that
Described ridge waveguide is made of semiconductor material, and its waveguide core district is the intrinsic region;
The height in described dull and stereotyped district can make described ridge waveguide have the contrast of strong refraction rate less than half of described wave guide ridge height, can be multimode waveguide;
Described P type doped region and N-type doped region are near the waveguide core district of described ridge waveguide, be high-concentration dopant, but only be limited to described dull and stereotyped district and do not enter described waveguide core district, when described PIN diode was driven by forward current, described two doped regions were as the injection source of charge carrier;
The width of described wave guide ridge is close with the overall height of described ridge waveguide, and most energy distribution of the main mould of waveguide conduction are limited in its waveguide core district fully;
The input pattern transducer of described mode converter connects the input end of described electric light PIN diode waveguide, the basic mode of input single mode waveguide all is converted to the basic mode of described electric light PIN diode waveguide; The output mode transducer of described mode converter connects the output terminal of described electric light PIN diode waveguide, the basic mode of described electric light PIN diode waveguide all is converted to the basic mode of output single mode waveguide.
2. electro-optic modulation system as claimed in claim 1 is characterized in that, the height in the flat board district of the ridge waveguide of described electric light PIN diode waveguide is as far as possible little, can be as small as the technique permissible value that guarantees that described dull and stereotyped district is not worn quarter.
3. electro-optic modulation system as claimed in claim 1 is characterized in that,
Described electric light PIN diode waveguide top has additional electrodes, described P type doped region and N-type doped region to comprise that respectively is positioned at the high heavily doped region of described additional electrodes below doping content.
4. electrooptical switching or an optical attenuator that is made of claim 1 or 2 or 3 described electro-optic modulation systems is characterized in that,
Described electrooptical switching or optical attenuator comprise one as the input Y branch coupler of input optical branching device successively from being input to output, a pair of described electro-optic modulation system and the output Y branch coupler as output combiner device;
Described a pair of electro-optic modulation system comprises the first electro-optic modulation system and the second electro-optic modulation system;
Described input Y branch coupler is made of single mode waveguide, comprise single waveguide of input, the first output branch waveguide and the second output branch waveguide, described the first output branch waveguide connects the input pattern transducer of described the first electro-optic modulation system, and described the second output branch waveguide connects the input pattern transducer of described the second electro-optic modulation system;
Described output Y branch coupler is made of single mode waveguide, comprise the first input branch-waveguide, the second input branch-waveguide and single waveguide of output, described the first input branch-waveguide connects the output mode transducer of described the first electro-optic modulation system, and described the second input branch-waveguide connects the output mode transducer of described the second electro-optic modulation system;
Input pattern transducer in the described a pair of electro-optic modulation system all is converted to the basic mode of described input Y branch coupler the basic mode of the electric light PIN diode waveguide in the described a pair of electro-optic modulation system, and the output mode transducer in the described a pair of electro-optic modulation system changes into the basic mode of described electric light PIN diode waveguide the basic mode of described output Y branch coupler;
Electric light PIN diode waveguide in the described a pair of electro-optic modulation system can be driven by a pair of additional electrodes respectively.
5. electrooptical switching according to claim 4 or optical attenuator is characterized in that: the single mode waveguide that consists of described input, output Y branch coupler comprises one section curved waveguide part that guided mode a little less than the high order is had high loss.
6. electrooptical switching according to claim 5 or optical attenuator is characterized in that:
Electric light PIN diode waveguide in described the first electro-optic modulation system has carrier injection, and described the second electro-optic modulation system is not or less carrier injection arranged;
The luminous power of the first output branch waveguide output of described input Y branch coupler is higher than the luminous power of its second output branch waveguide output, and this luminous power difference equals the additional light loss that the electric light PIN diode waveguide in described the first electro-optic modulation system produces.
7. electrooptical switching according to claim 6 or optical attenuator is characterized in that: the starting point of the first output branch waveguide of described input Y branch coupler is positioned at starting point the place ahead of its second output branch waveguide at optical propagation direction.
8. electrooptical switching according to claim 6 or optical attenuator is characterized in that:
Between the first output branch waveguide of described input Y branch coupler and single waveguide of its input perpendicular to the interval on the optical propagation direction, less than between its second output branch waveguide and single waveguide of its input perpendicular to the interval on the optical propagation direction.
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| CN102967951A (en) * | 2011-08-30 | 2013-03-13 | 上海硅通半导体技术有限公司 | Electro-optical modulation system and electro-optical switch or optical attenuator formed by electro-optical modulation system |
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| CN113759460A (en) * | 2021-09-14 | 2021-12-07 | 苏州微光电子融合技术研究院有限公司 | Polarization-independent variable optical attenuator |
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| US9927677B2 (en) * | 2016-06-10 | 2018-03-27 | Huawei Technologies Co. Ltd. | Optical interferometer device tolerant to inaccuracy in doping overlay |
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| FR2558270B1 (en) * | 1984-01-18 | 1986-04-25 | Comp Generale Electricite | HIGH SENSITIVITY INTERFERENTIAL ELECTRO-OPTICAL MODULATOR |
| US6288823B1 (en) * | 1999-10-27 | 2001-09-11 | Texas A&M University System | Slow wave electrooptic light modulator apparatus and method |
| JP2004004589A (en) * | 2002-03-25 | 2004-01-08 | Japan Science & Technology Corp | Mach-zehnder waveguide type electrooptic light intensity modulator |
| KR100888299B1 (en) * | 2003-03-19 | 2009-03-11 | 니폰덴신뎅와 가부시키가이샤 | Optical switch |
| US7555173B2 (en) * | 2003-04-09 | 2009-06-30 | Cornell Research Foundation, Inc. | Electro-optic modulator on rib waveguide |
| EP1730586A1 (en) * | 2004-03-31 | 2006-12-13 | Pirelli & C. S.p.A. | Optical modulator |
| CN202870424U (en) * | 2011-08-30 | 2013-04-10 | 上海硅通半导体技术有限公司 | Electro-optical modulation system and electro-optical switch or optical attenuator comprising the same |
-
2012
- 2012-08-30 CN CN201220458592.8U patent/CN202870424U/en not_active Expired - Lifetime
- 2012-08-30 CN CN2012103276599A patent/CN102967951A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967951A (en) * | 2011-08-30 | 2013-03-13 | 上海硅通半导体技术有限公司 | Electro-optical modulation system and electro-optical switch or optical attenuator formed by electro-optical modulation system |
| CN112327270A (en) * | 2020-11-04 | 2021-02-05 | 国科光芯(海宁)科技股份有限公司 | On-chip integrated chaotic radar chip and preparation method thereof |
| CN113759460A (en) * | 2021-09-14 | 2021-12-07 | 苏州微光电子融合技术研究院有限公司 | Polarization-independent variable optical attenuator |
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