CN102809830B - Polarization beam splitter with optical path difference compensation structure - Google Patents
Polarization beam splitter with optical path difference compensation structure Download PDFInfo
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- CN102809830B CN102809830B CN201210314702.8A CN201210314702A CN102809830B CN 102809830 B CN102809830 B CN 102809830B CN 201210314702 A CN201210314702 A CN 201210314702A CN 102809830 B CN102809830 B CN 102809830B
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Abstract
The invention discloses a polarization beam splitter with an optical path difference compensation structure. The polarization beam splitter with the optical path difference compensation structure comprises a parallelogram prism (103), a polarization beam-splitting crystal solid (104), a half wave plate (105), a total reflection prism (106) and a compensator (107). The parallelogram prism (103) corresponds to an optical path of incoming local oscillation light. The polarization beam-splitting crystal solid (104) respectively corresponds to an optical path of input signal light and the optical path of the local oscillation light refracted by the parallelogram prism (103). The half wave plate (105) and the total reflection prism (106) are sequentially disposed at the rear end of one split light path of the polarization beam-splitting crystal solid (104). The compensator (107) is disposed at the rear end of the other short-distance split light path of the polarization beam-splitting crystal solid (104). The compensator (7) is a pervious element combination capable of compensating optical path difference. The polarization beam splitter is simple in structure, convenient to operate, applicable to the front end of a 100GDP-QPSK (quadrature phase-shift keying) receiver, and capable of polarizing and separating signal light and local oscillation light and guaranteeing synchronous receiving of all branches of signals.
Description
Technical field
The present invention relates to a kind of polarization beam apparatus, relate in particular to a kind of polarization beam apparatus that can be applied to the integrated coherent receiver front end of 100G DP-QPSK, the invention belongs to the communications field.
Background technology
100G DP-QPSK(Dual polarization quadrature phase-shift keying) integrated coherent receiver is the important optical device based on planar optical waveguide integrated technology.The ultimate principle of 100G DP-QPSK receiver is: the flashlight receiving and local oscillator light are separated into two-way single polarization by polarization beam apparatus, the flashlight of single polarization mixes by frequency mixer with local oscillator light, then pass through detector, trans-impedance amplifier is converted to the electric signal of amplification, as shown in Figure 1.Light signal is from entering receiver, till electric signal output, these signals can be divided into four pairs of channels, and the path that these channels are passed by is in theory identical, does not have delay issue.But in actual device, can there is difference in the path of light signal and electric signal, and these difference can cause the delay inequality problem of the signal of each transmission.Delay inequality that there are some researches show channel can produce significant impact to the performance of receiver, therefore how to be accurately controlled in tolerance interval poor channel delay, is a key issue that must solve.In addition, also require the size of polarization beam apparatus to try one's best little of to reduce the overall dimensions of module.
According to the definition of OIF (Optical Internetworking Forum), for the integrated coherent receiver of 100G DP-QPSK, channel delay is poor is defined as photosignal by the mistiming of the fastest and slow channel, and maximum can not exceed 10ps.
As shown in Figure 1, the front end of traditional 100G DP-QPSK receiver, input signal light 101 uses first polarization beam apparatus 109, local oscillator light 102 uses a power splitter 110, local oscillator is single polarization only, the optical fiber of input local oscillator light need be with using polarization maintaining optical fibre, and flashlight 101 and local oscillator light 102 enter 90 of receiver by the first polarization beam apparatus 109, power splitter 110 respectively
.optical mixer unit 111, PD array 112, across resistance amplifying circuit 113.Polarization maintaining optical fibre will pass shell, and will seal, and therefore needs complicated metallization polarization maintaining optical fibre.
Summary of the invention
The object of the invention is to overcome the problem that prior art exists, the polarization beam apparatus with optical path difference compensation technique of the integrated coherent receiver of a kind of 100G of being applied to DP-QPSK is provided, this polarization beam apparatus is realized simple, and volume is little, and it is poor to compensate the channel delay of integrated coherent receiver.
The technical solution adopted in the present invention is:
A kind of polarization beam apparatus with optical path difference collocation structure, comprise parallelogram prism, polarization beam splitting crystal, half-wave plate, total reflection prism and compensator, parallelogram prism is corresponding with the local oscillator light light path of input, polarization beam splitting crystal is corresponding with the local oscillator light light path of process parallelogram prismatic refraction with the flashlight light path of input respectively, light splitting optical path rear end, polarization beam splitting crystal Yi road is disposed with half-wave plate, total reflection prism, the short light splitting optical path rear end of another road light path of polarization beam splitting crystal is provided with compensator, this compensator adopts can realize the translucent element combination that optical path difference compensates.
The translucent element of described composition compensator, its material is glass or quartz or silicon.
Described compensator angle of wedge translucent element corresponding by two inclined-planes and that can realize move toward one another forms.
The light transmission piece that described compensator is identical by multiple refractive indexes and thickness is different is laminated.
The invention has the beneficial effects as follows:
1, the present invention can be applied to the front end of 100G DP-QPSK receiver, not only can separate with local oscillator polarisation of light by settling signal light, but also can guarantee the synchronous reception of each road signal;
2, the present invention has avoided the metallization polarization maintaining optical fibre of the input end operation complexity of local oscillator light;
3, structure of the present invention, without the characteristic that changes polarization beam splitting crystal, can not cause the deterioration of other performance;
4, the present invention is simple in structure, easy to operate, is applicable to commercial production.
Brief description of the drawings
Fig. 1, apply 100G DP-QPSK receiver structure block diagram of the prior art;
The 100G DP-QPSK receiver structure block diagram of Fig. 2, application the technology of the present invention;
The optical path difference compensation principle figure of Fig. 3, first embodiment of polarization beam apparatus of the present invention;
Fig. 4, first example structure schematic diagram of polarization beam apparatus of the present invention;
Fig. 5, second example structure schematic diagram of polarization beam apparatus of the present invention;
Wherein:
101, flashlight; 102, local oscillator light;
103, parallelogram prism; 104, polarization beam splitting crystal;
105, half-wave plate; 106, total reflection prism;
107, compensator; 108, angle of wedge translucent element;
207, light transmission piece; 1, angle of wedge translucent element primary importance;
2, the angle of wedge translucent element second place; 3, angle of wedge translucent element the 3rd position;
109, the first polarization beam apparatus 110, power splitter;
111、90
。optical mixer unit; 112, PD array;
113, trans-impedance amplifier; 114, the second polarization beam apparatus;
Embodiment
Below in conjunction with embodiment, polarization beam splitter structure of the present invention is made further instructions.
Be illustrated in figure 4 first embodiment of the invention structure, second polarization beam apparatus 114 its light channel structures are by parallelogram prism 103, polarization beam splitting crystal 104, half-wave plate 105, total reflection prism 106 and compensator 107 form, parallelogram prism 103 is corresponding with local oscillator light 102, polarization beam splitting crystal 104 is respectively with the local oscillator light 102 reflecting through parallelogram prism 103, flashlight 101 is parallel corresponding, the vertical light splitting optical path rear end of polarization beam splitting crystal 104 is disposed with half-wave plate 105, total reflection prism 106, the parallel light splitting optical path rear end of polarization beam splitting crystal 104 is provided with compensator 107, compensator 107 is combinations of a series of translucent elements, we are by reasonably selecting translucent element material and the thickness of collocation structure, the light path that regulates light signal to pass through, just can be to being applied to poor the compensating of channel delay of 100G DP-QPSK receiver, adapt to the requirement of 100G DP-QPSK receiver.The light path that compensator can regulate light signal to pass through, thus compensate the difference of the time delay that signal in upper and lower two frequency mixer causes due to light path difference.In the present embodiment, form the translucent element of compensator 107 with the angle of wedge, taking triangle as example, compensator 107 can adopt two angle of wedge translucent elements 108 that inclined-plane is corresponding, angle of wedge translucent element 108 has larger refractive index, can be the materials such as glass, quartz, silicon.
Input signal beam in the present invention and the interval of local beam can arrange flexibly, do not need with polarization beam apparatus after the position of light input end mouth of device be consistent, the size of parallelogram prism is only depended in the position of two light beams, and parallelogram prism is used for adjusting input signal light and the middle distance of local oscillator light.In sum, the distance in the middle of the input signal beam of polarization beam apparatus of the present invention and local beam is adjustable, can be used for adjusting input signal light and the middle distance of local oscillator light of polarization beam apparatus by the size setting of parallelogram prism.In the present invention, flashlight and local oscillator light share same polarization beam splitting crystal in addition, and the input end of local oscillator light does not need metallized polarization maintaining optical fibre, simple in structure, and volume is little.
The process of describing function realization of the present invention for first embodiment in conjunction with Fig. 2 is specific as follows: flashlight 101 enter parallelogram prism 103 parallel with local oscillator light 102, by resolving into two mutually orthogonal polarized lights after polarization beam splitting crystal 104, wherein a branch of polarized light converts to and the identical light of another bundle polarization state by half-wave plate 105, then through total reflection prism 106 reflection couplings enter receiver a wherein road 90
.optical mixer unit 111, PD array 112, across resistance amplifying circuit 113.Because flashlight is different with the light path of the two pair single polarizations of local oscillator light after polarization beam splitting crystal separates, two differences 90 that make to enter receiver
.optical mixer unit has optical path difference, causes the passage of receiver to exist channel delay poor, and in receiver, after opto-electronic conversion, the length of the bonding gold wire of the transmission line of electric signal process and transmission line interconnection also there are differences in addition, causes that the time delay of channel is also different.The poor accumulation of these channel delay may cause the requirement of the poor OIF of the exceeding standard of the total channel delay of receiver.Therefore in the shorter parallel light path of our light path in polarization beam apparatus light path, adding compensator 107 regulates total optical path poor.Angle of wedge inclined-plane by two angle of wedge translucent elements 108 in compensator 107 move up and down the light path that can change this collocation structure, another bundle polarized light that makes to decompose by polarization beam splitting crystal 104 enter receiver another road 90
.optical mixer unit 111, PD array 112, across resistance amplifying circuit 113, thereby it is poor with the scope of touching the mark accurately to adjust the channel delay of receiver output terminal.
In conjunction with Fig. 3, the optical path difference compensation principle of first embodiment is described, collocation structure of the present invention is made up of two corresponding angle of wedge translucent elements in inclined-plane, these two angle of wedge translucent element move toward one another, change to the angle of wedge translucent element second place 2 again to angle of wedge translucent element primary importance 1, light path by angle of wedge translucent element the 3rd position 3
progressively become large, the light path of compensator structure increases, now progressively become large through the shorter light path of a pair of polarized light above of polarization beam splitting crystal light path out, therefore make the optical path difference of two different frequency mixer that enter 100G receiver progressively diminish, thereby it is poor accurately to adjust the channel delay of receiver output terminal.
Fig. 5 is second embodiment of structure of the present invention, the light transmission piece 207 that the compensator structure that it is characterized in that the second polarization beam apparatus 114 is multiple thickness differences, refractive index is identical bonds together, and the thickness of light transmission piece and quantity setting are the optical path differences in order to compensate two different frequency mixer that enter receiver.These light transmission piece have larger refractive index, can be the materials such as glass, quartz, silicon.Compensator 107 in the present embodiment is compensators of the light transmission piece composition with identical refractive index that thickness is different, can control light path by the quantity that increases or reduce light transmission piece, thereby reduce total delay inequality, the optical path difference of two different frequency mixer that enter 100G receiver is diminished, thereby the channel delay of adjustment receiver output terminal is poor.The present embodiment can arrange the thickness of translucent element neatly, reduces to greatest extent the optical path difference of two pairs of different polarization light.
Although the polarization beam splitting crystal 104 of embodiment mono-and embodiment bis-two-way polarized light light path Duan mono-tunnel is out parallel in the present invention, optical length Yi road is vertical, but it is vertical in actual conditions, only needing the brilliant two-way polarized light of polarization beam splitting, therefore not necessarily parallel light path and vertical optical path of this two-way light, the present invention only need to be provided with compensator to the short light splitting optical path rear end of polarization beam splitting crystal 104 light path out optical path difference is compensated.
Although the present invention has at length illustrated and described two relevant specific embodiment references, those skilled in the art can should be appreciated that, can make in the form and details various changes not deviating from the spirit and scope of the present invention.These change all will fall into the desired protection domain of claim of the present invention.
Claims (4)
1. one kind has the polarization beam apparatus of optical path difference collocation structure, it is characterized in that: comprise parallelogram prism (103), polarization beam splitting crystal (104), half-wave plate (105), total reflection prism (106) and compensator (107), parallelogram prism (103) is corresponding with local oscillator light (102) light path of input, polarization beam splitting crystal (104) is corresponding with the local oscillator light light path reflecting through parallelogram prism (103) with flashlight (101) light path of input respectively, light splitting optical path rear end, polarization beam splitting crystal (104) Yi road is disposed with half-wave plate (105), total reflection prism (106), the short light splitting optical path rear end of another road light path of polarization beam splitting crystal (104) is provided with compensator (107), this compensator (107) adopts can realize the translucent element combination that optical path difference compensates.
2. a kind of polarization beam apparatus with optical path difference collocation structure as claimed in claim 1, is characterized in that: the translucent element of described composition compensator (107), its material is glass or quartz or silicon.
3. a kind of polarization beam apparatus with optical path difference collocation structure as claimed in claim 1 or 2, is characterized in that: described compensator (107) angle of wedge translucent element (108) corresponding by two inclined-planes and that can realize move toward one another forms.
4. a kind of polarization beam apparatus with optical path difference collocation structure as claimed in claim 1 or 2, is characterized in that: the light transmission piece (207) that described compensator (107) is identical by multiple refractive indexes and thickness is different is laminated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210314702.8A CN102809830B (en) | 2012-08-30 | 2012-08-30 | Polarization beam splitter with optical path difference compensation structure |
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| CN201210314702.8A CN102809830B (en) | 2012-08-30 | 2012-08-30 | Polarization beam splitter with optical path difference compensation structure |
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| CN102809830B true CN102809830B (en) | 2014-10-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2522082B (en) | 2014-03-14 | 2016-02-24 | Oclaro Technology Ltd | Optical component |
| JP7123652B2 (en) * | 2018-06-20 | 2022-08-23 | 株式会社ディスコ | Laser processing equipment |
| CN111525962B (en) * | 2019-02-02 | 2021-09-03 | 华为技术有限公司 | Coherent optical receiver, coherent optical processing method, and coherent optical receiving apparatus |
| CN112311471B (en) * | 2020-09-29 | 2022-03-04 | 西安空间无线电技术研究所 | Equal optical path difference processing method and device |
| CN114244438A (en) * | 2021-12-16 | 2022-03-25 | 苏州易锐光电科技有限公司 | Optical processing device, optical amplifier, and optical modulator |
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| JP2580104B2 (en) * | 1984-10-09 | 1997-02-12 | ソニー株式会社 | Projection type display device |
| KR950703164A (en) * | 1993-06-25 | 1995-08-23 | 에프.제이. 스미트 | Polarizing beam splitter and magneto-optic reading device using the same |
| CN1704782A (en) * | 2004-05-28 | 2005-12-07 | 翔光(上海)光通讯器材有限公司 | Optical switch and switching method thereof |
| CN2840526Y (en) * | 2005-11-15 | 2006-11-22 | 上海未来宽带技术及应用工程研究中心有限公司 | Reconfigurating optical add/drop multiplexing device |
| CN201063080Y (en) * | 2007-08-03 | 2008-05-21 | 福州高意通讯有限公司 | Polarized optical modulator |
| CN101520557B (en) * | 2009-03-11 | 2010-12-01 | 福州高意光学有限公司 | Polarization controller |
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