CN1173201C - Broadband optical-fibre wave plate with multiple polarization state conversion functions - Google Patents
Broadband optical-fibre wave plate with multiple polarization state conversion functions Download PDFInfo
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- CN1173201C CN1173201C CNB011126809A CN01112680A CN1173201C CN 1173201 C CN1173201 C CN 1173201C CN B011126809 A CNB011126809 A CN B011126809A CN 01112680 A CN01112680 A CN 01112680A CN 1173201 C CN1173201 C CN 1173201C
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Abstract
The present invention relates to a broadband optical fiber wave plate which comprises a section of distorted linear birefringence optical fiber, wherein one end of the optical fiber is a non-distorted end, and the other end is a quick distorted end. The optical fiber gradually changes into quick distortion from non-distortion along the length direction. The function of the optical fiber wave plate is similar to that of an agglomerate quarter wave plate. The optical fiber wave plate can realize various kinds of polarization conversion, and the characteristics of a broad frequency band, on-line application, etc. of the optical fiber wave plate are far superior to those of traditional agglomerate wave plates. The present invention is especially suitable for the application fields of communication, sensing, etc. The broadband optical fiber wave plate can be respectively made into an optical fiber one-half wave plate, an optical fiber full-wave plate and an optical fiber fraction wave plate if the broadband optical fiber wave plate uses different distortion structures.
Description
The present invention relates to optical wave plate, relate in particular to broadband optical-fibre wave plate with multiple polarization state conversion functions.
Traditional optical wave plate adopts certain thickness birefringece crystal to make (below be also referred to as block wave plate), and it can be used for incident polarized light is carried out conversion.Be transformed to the elliptically polarized light or the garden polarized light (quarter-wave plate) of outgoing as linearly polarized light, or the linearly polarized light of incident is transformed to the linearly polarized light (1/2nd wave plates) that a vibration plane has rotated certain angle incident.But the working band of above-mentioned block wave plate is very narrow, and can not onlinely use, and is being subjected to certain restriction such as applications such as communication and sensings.
The object of the present invention is to provide a kind of working band wide, can online application, and broadband optical-fibre wave plate with multiple polarization conversion function.
According to an aspect of the present invention, a kind of broadband optical-fibre wave plate is provided, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is the optical fiber quarter-wave plate, and an end of described optical fiber is turn-knob end not, and the other end is fast turn-knob end, never turn-knob is gradual gradually is fast turn-knob along its length direction for described optical fiber, and the bandwidth of operation of described optical-fibre wave plate is substantially equal to the bandwidth of operation of single-mode fiber.
The function class of above-mentioned optical-fibre wave plate is similar to block quarter-wave plate, can realize following various polarisation transformation by it:
The main axis polarized light of not turn-knob end incident is transformed to fast turn-knob brings out the garden polarized light of penetrating;
Being transformed to the garden polarized light of fast turn-knob end incident not, turn-knob brings out the main axis polarized light of penetrating;
The random linearly polarized light in orientation of fast turn-knob end incident is transformed to turn-knob not brings out the luminous power of penetrating along two main shaft five equilibriums and phase differential contains two main axis polarized light components of incident angle, the phase differential between described two components be two times of incident light position angles add the next item up with the optical fiber beat wavelength, revolve distance and fine long relevant constant;
The linearly polarized light that particular value is got at the position angle of fast turn-knob end incident is transformed to not, and turn-knob brings out the garden polarized light of penetrating;
The garden polarized light of not turn-knob end incident is transformed to fast turn-knob brings out the linearly polarized light that particular value is got at the position angle of penetrating.
According to a further aspect in the invention, a kind of broadband optical-fibre wave plate is provided, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is optical fiber 1/2nd wave plates, one end of described optical fiber is fast turn-knob end, the other end is oppositely fast turn-knob end, described optical fiber is gradual gradually along its length direction from fast turn-knob to be turn-knob not, never continues again that turn-knob is oppositely gradual gradually to be fast turn-knob, the incident end that described fast turn-knob end is a linearly polarized light, described oppositely fast turn-knob end is the exit end of linearly polarized light, wherein, when described wave plate changeed an angle, the azimuthal variations that is positioned at the linearly polarized light of exit end was 2 times of wave plate corner.
The function class of above-mentioned optical-fibre wave plate is similar to block 1/2nd wave plates, i.e. half-wave plate.The linearly polarized light of fast turn-knob end incident can be transformed to oppositely fast turn-knob by it and bring out the linearly polarized light of penetrating, the phase differential of this emergent light and incident light is π, and when described optical-fibre wave plate changeed an angle, the azimuthal variations that is positioned at the linearly polarized light of exit end was 2 times of optical-fibre wave plate corner.
According to a further aspect in the invention, a kind of broadband optical-fibre wave plate is provided, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is the optical fiber full-wave plate, one end of described optical fiber is turn-knob end not, the not turn-knob end that the other end goes to zero for turn-knob in the same way, never turn-knob is gradual gradually is fast turn-knob along its length direction for described optical fiber, continue again to be turn-knob not from fast turn-knob is gradual gradually in the same way, described not turn-knob end and in the same way not the turn-knob end be respectively the incident end and the exit end of linearly polarized light, the fast turn-knob of described optical fiber is partly as the senser element of surveying Faraday effect.
According to a further aspect in the invention, a kind of broadband optical-fibre wave plate is provided, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that described optical-fibre wave plate is an optical fiber mark wave plate, an end of described optical fiber is turn-knob end not, the other end is a middling speed turn-knob end, never turn-knob is gradual gradually is the middling speed turn-knob along its length direction for described optical fiber, and described not turn-knob end is the incident end of linearly polarized light, and described middling speed turn-knob end is single ellipse intrinsic light.
The function class of above-mentioned optical-fibre wave plate is similar to block mark wave plate, the linearly polarized light of not turn-knob end incident can be transformed to the middling speed turn-knob by it and bring out the single ellipse intrinsic light of penetrating.
Below with reference to drawings and Examples broadband optical-fibre wave plate of the present invention is described in further detail.Other purpose of the present invention, feature and advantage in the following description will be clearer.
Fig. 1 is the structural representation of the optical fiber quarter-wave plate of expression first embodiment according to the invention.
Fig. 2 is the expression application synoptic diagram of optical fiber quarter-wave plate in coherent communication shown in Figure 1.
Fig. 3 is the structural representation of expression according to optical fiber 1/2nd wave plates of second embodiment of the present invention.
Fig. 4 A and 4B are the structural representation of expression according to the optical fiber full-wave plate of the 3rd embodiment of the present invention.
Fig. 5 is a kind of rotation function curve map of optical fiber full-wave plate shown in Fig. 4 B.
Fig. 6 is the structural representation of expression according to the optical fiber mark wave plate of the 4th embodiment of the present invention.
Referring to Fig. 1, it represents first embodiment according to the invention, as the structural representation of the optical fiber quarter-wave plate of the elementary cell of broadband optical-fibre wave plate.This optical-fibre wave plate be one section from being threaded onto the not linear birefringence optical fiber of turn-knob soon.Among the figure, one section mutarotation of label 1 expression is apart from optical fiber; The cross section of label 2 these optical fiber of expression; Label 3 expression fibre cores; Label 4 expression stress districts, the density of arrow is represented the speed of optical fiber turn-knob.One end of Z=0 shown in Figure 1 place optical fiber is fast knob end, and the other end of Z=L place optical fiber is knob end not.
No. 88107389 Chinese patent application that the optical fiber of similar structures is submitted on October 23rd, 1988 the same applicant of the application, and in the 4th, 943, No. 132 United States Patent (USP)s of nineteen ninety acquisition, disclose as a kind of " passive polarization state controller ".Wherein " polarization state control " is meant the azimuthal control to the random linearly polarized light of incident optical.Promptly, if at the random linearly polarized light (its position angle is represented by random independent variable θ) of the fast turn-knob end incident one of optical fiber, then the power that brings out the light of penetrating at the not knob of optical fiber is along two main shaft five equilibriums, and the phase differential Ω of two main shaft light components then contains this random independent variable θ, that is:
|A
x(L)|
2＝|A
y(L)|
2＝0.5 (1)
Wherein, g=π [1+4 (L
b/ L
s)
2]
1/2, and L
bWith L
sBe respectively the beat wavelength of optical fiber structure and revolve distance, the upper limit of integral L in the formula (2) is fine long.
According to formula (2), establish if θ takes off the row particular value, promptly
Ω=pi/2 (4) then
By formula (1) and (4) as seen, when the particular value of the position angle modus ponens (3) of the linearly polarized light of incident, the light of outgoing is circularly polarized light.That is, above-mentioned mutarotation birefringence fiber has the characteristic that linearly polarized light is transformed to circularly polarized light under the condition of formula (3).
Utilize the above-mentioned characteristic of mutarotation birefringence fiber, the application's optical fiber quarter-wave plate can be realized multiple polarized light conversion, and its effect is similar with traditional block quarter-wave plate.But compare with traditional block quarter-wave plate, the application's optical fiber quarter-wave plate can online application and is had extremely wide working band (being the bandwidth that bandwidth is substantially equal to single mode operation), is particularly useful for fields such as communication and sensing.
Above-mentioned broadband optical-fibre wave plate can utilize existing wire drawing machine equipment to be equipped with variable-speed motor and be processed into.Another kind of approach is to adopt the application's same applicant to make above-mentioned broadband optical-fibre wave plate in the 5th, 096, No. 312 described microcell heating techniques of United States Patent (USP) of acquisition on March 17th, 1992.Wherein, micro-heater moves along a birefringence fiber, and simultaneously, this local optical fiber hot-zone is rotated by speed change.
Table 1 and table 2 have been listed the characteristic contrast of several polarisation transformations of traditional block quarter-wave plate and the application's optical fiber quarter-wave plate respectively.In the table 1, under optical axis was vertical situation, the line polarisation that is transformed into from right garden polarisation and left garden polarisation should exchange, and the right garden polarisation that becomes from π/4 incidence wire polarisations should change left garden polarisation into.Under the situation of axes of coordinates rotation π/4 jiao, the power five equilibrium is still set up, but the phase differential formula becomes 2 θ+π.In the table 2, each conversion refers to that all the optical fiber sense of rotation is (+), promptly clockwise situation.If optical fiber rotates to be (-) or counterclockwise, then in the table x main axis partially and the y main axis should exchange partially, and the specific line in position angle should to change another perpendicular partially line of line therewith partially into inclined to one side.If optical fiber sense of rotation it (+) changes simultaneously with a left side and the right side of (-) and incident garden polarisation, then outgoing polarization state of light is constant.The integration type on ρ that is formula (2) and formula (3) the right in the table, it is the lumped parameter of being changeed the full architectural feature of representative that three parameters of optical fiber (be that optical fiber revolves distance, clap long and optical fiber total length when not revolving) are determined by mutarotation.
Table 1: the polarisation transformation characteristic of the block wave plate in arrowband
Incident light, emergent light is with reference to axes of coordinates
Be in the z=L place at z=0
The line of right garden folk prescription parallactic angle (3/4) π is inclined to one side
The optical axis level
The line of left side garden folk prescription parallactic angle π/4 is inclined to one side
Block optics quarter wave plate
The line of position angle π/4 garden that takes over is inclined to one side
The inclined to one side power five equilibrium of line that the position angle is any
Ω＝-2θ
Table 2: the polarisation transformation characteristic of broadband optical-fibre wave plate
The structured sort incident light, emergent light is with reference to axes of coordinates
Be in the z=L place at z=0
The inclined to one side x main axis in right garden is inclined to one side
The inclined to one side y main axis in garden, a left side is inclined to one side
Four kinds of conversion of the specific left column in optical fiber quarter wave plate position angle all with
Being screwed into the line that the does not revolve local partially main shaft in garden of taking back soon is reference
The inclined to one side power five equilibrium of line that the position angle is any
|A
x|
2＝|A
y|
2＝1/2 Ω＝π/2+2ρ-2θ
The specific local partially main shaft of line of right garden folk prescription parallactic angle
The optical fiber quarter wave plate
Be not screwed into and revolve the specific local partially main shaft of line of left garden folk prescription parallactic angle soon
The local partially main shaft of line that the line folk prescription parallactic angle of position angle π/4 is specific
The inclined to one side power five equilibrium of line that the position angle is any
| A
x|
2=| A
y|
2=1/2 revolve-the axes of coordinates Ω=2 θ-pi/2 at ρ angle
As seen from Table 2, optical fiber quarter-wave plate shown in Figure 1 both can be with the incident end of fast turn-knob end as polarized light, also can be with turn-knob end not as the incident end of polarized light.For example, it can be transformed to the circularly polarized light of fast turn-knob end incident not that turn-knob brings out the main axis polarized light of penetrating; The main axis polarized light of not turn-knob end incident is transformed to fast turn-knob brings out the circularly polarized light of penetrating; The linearly polarized light that particular value is got at the position angle of fast turn-knob end incident is transformed to not, and turn-knob brings out the circularly polarized light of penetrating; The circularly polarized light of not turn-knob end incident is transformed to fast turn-knob brings out the linearly polarized light that particular value is got at the position angle of penetrating; And, the random linearly polarized light in orientation of fast turn-knob end incident is transformed to turn-knob not brings out the luminous power of penetrating along two main shaft five equilibriums and phase differential contains two main axis polarized light components of incident angle, or the like.
Fig. 2 represents the application's the application example of optical fiber quarter-wave plate in coherent communication.Among Fig. 2, the linearly polarized light that provides by conventional light source LD by turn-knob end not as incident end, fast turn-knob end optical fiber quarter-wave plate PPT as exit end
1This linearly polarized light is transformed to circularly polarized light.At the output terminal of optic fibre light path, utilize fast turn-knob end as the incident end, the turn-knob end is not as the optical fiber quarter-wave plate PPT of exit end
2The circularly polarized light that transmits is transformed to linearly polarized light offers detecting device D.
Fig. 3 is the structural representation of expression according to optical fiber 1/2nd wave plates of second embodiment of the present invention.It is one section linear birefringence optical fiber, and the one end is fast turn-knob end, and the other end is oppositely fast turn-knob end, and this optical fiber is gradual gradually along its length direction from fast turn-knob to be turn-knob not, and continuing again that never turn-knob is oppositely gradual gradually is fast turn-knob.That is, the centre of wave plate does not rotate, the reverse high speed rotating in two ends, and it is gradual to require to revolve speed, but do not require the both sides symmetry.Its function class is similar to traditional block half-wave plate (i.e. 1/2nd wave plates).This kind wave plate can be transformed to the linearly polarized light of fast turn-knob end incident oppositely fast turn-knob and bring out the linearly polarized light of penetrating, the phase differential of this emergent light and incident light is π, and when described wave plate changeed an angle, the azimuthal variations that is positioned at the linearly polarized light of exit end was 2 times of wave plate corner.
Fig. 4 A and 4B are the structural representations of representing respectively according to the optical fiber full-wave plate of the 3rd embodiment of the present invention.Referring to Fig. 4 A, an end of this optical-fibre wave plate is fast turn-knob end, and the other end is fast in the same way turn-knob end, gradually gradually along its length direction from fast turn-knob is turn-knob not, and continuing again that never turn-knob is gradual gradually in the same way is fast turn-knob.That is, the centre of wave plate does not rotate, and two ends are high speed rotating in the same way, and it is gradual to require to revolve speed, but does not require the both sides symmetry.Adopt this optical fiber full-wave plate, the circularly polarized light of incident can be transformed to the circularly polarized light of outgoing.
One end of optical-fibre wave plate shown in Fig. 4 B is turn-knob end not, and the other end is for to revolve the not turn-knob end that speed goes to zero in the same way, and never turn-knob is gradual gradually along its length direction is fast turn-knob, continues again to be turn-knob not from fast turn-knob is gradual gradually in the same way.That is, the centre of wave plate is a high speed rotating, and two ends do not rotate, and it is gradual to require to revolve speed, but does not require the both sides symmetry.Adopt this optical fiber full-wave plate, the linearly polarized light of incident can be transformed to the linearly polarized light of outgoing.
Fig. 5 represents the rotation function curve of this optical fiber full-wave plate, and wherein, two ends are turn-knob not, and the centre is fast turn-knob.This kind optical-fibre wave plate can be used for electric current and magnetic field sensor.
The principle of work of optical fiber 1/2nd wave plates and full-wave plate can be illustrated according to the structural representation shown in Fig. 3 and Fig. 4 A, the 4B respectively./ 2nd wave plates shown in Figure 3 can be considered the unitized construction of two optical fiber quarter-wave plates.By aforementioned principle of work about quarter-wave plate, first quarter-wave plate is transformed to the circularly polarized light of incident the main axis polarized light of intermediate fibres section among Fig. 3.This main axis polarized light is transformed to circularly polarized light at last output terminal again by second quarter-wave plate.Opposite because of second quarter-wave plate again with the turn-knob direction of first quarter-wave plate, so the left-handed dextrorotation of output terminal circularly polarized light and input end circularly polarized light is exchanged, the polarization state conversion functions that is whole 1/2nd wave plates is that left circularly polarized light is transformed to right-circularly polarized light, or opposite.At incident light is under the situation of linear polarization, according to table 1, can know the polarization state conversion functions of 1/2nd optical-fibre wave plates to incident ray polarized light by inference from the polarization state conversion functions of two 1/4th optical-fibre wave plates.
Optical fiber full-wave plate shown in Fig. 4 A, the 4B also can be considered the unitized construction of two optical fiber quarter-wave plates.As if this point can not be thought justice from the notion of Traditional bulk optical wave plate, should be four times of block quarter-wave plate because of the thickness of block full-wave plate., must emphasize: although optical-fibre wave plate has a series of similar polarization state conversion functions to block wave plate, the principle of work of this two classes wave plate is completely different for this reason, so that causes the former to distinguish for the basic of arrowband for the broadband latter.For example, press Fig. 4 A, two optical fiber quarter-wave plates are turn-knob in the same way, thus outgoing polarization state of light and polarization of incident light attitude repeat fully, different only be a phase differential.
Fig. 6 is the structural representation of expression according to the optical fiber mark wave plate of the 4th embodiment of the present invention.Shown in an end of optical-fibre wave plate be turn-knob end not, the other end is a middling speed turn-knob end, never turn-knob is gradual gradually is middling speed turn-knob (revolving the same magnitude of beat wavelength apart from turn-knob not the time) along its length direction.L shown in the figure
tSection is the middling speed turn-knob for turn-knob is not gradual, and the L section is to keep the optical fiber of the constant continuation wire drawing of middling speed turn-knob gained.The function class of above-mentioned optical-fibre wave plate is similar to block mark wave plate, the linearly polarized light of not turn-knob end incident can be transformed to the middling speed turn-knob by it and bring out the single ellipse intrinsic light of penetrating.
The above only is several certain embodiments of the present invention.According to design of the present invention, those skilled in the art also can make various conversion or modification to this, but this conversion or modification all belong to scope of the present invention.
Claims (12)
1. broadband optical-fibre wave plate, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is the optical fiber quarter-wave plate, one end of described optical fiber is turn-knob end not, the other end is fast turn-knob end, and never turn-knob is gradual gradually is fast turn-knob along its length direction for described optical fiber, and the bandwidth of operation of described optical-fibre wave plate is substantially equal to the bandwidth of operation of single-mode fiber.
2. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described fast turn-knob end is
The incident end of right-hand circularly polarized light, described not turn-knob end is
The exit end of X main axis polarized light, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
3. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described fast turn-knob end is
The incident end of left garden polarized light, described not turn-knob end is
The exit end of Y main axis polarized light, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
4. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described fast turn-knob end is
The incident end of the random linearly polarized light in orientation, described not turn-knob end is | A
x|
2=| A
y|
2=1/2, the luminous power of Ω=pi/2+2 ρ-2 θ is along two main shaft five equilibriums and phase differential contains the exit end of two main axis polarized light components of incident angle, phase differential between described two components is that two times of incident light position angles add the next item up ρ, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
5. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described fast turn-knob end is
The position angle get the incident end of the linearly polarized light of particular value, described not turn-knob end is
The exit end of left garden polarized light, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
6. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described not turn-knob end is
The incident end of right garden polarized light, described fast turn-knob end is
The position angle get the exit end of the linearly polarized light of particular value, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
7. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described not turn-knob end is
The incident end of left garden polarized light, described fast turn-knob end is
The position angle get the exit end of the linearly polarized light of particular value, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
8. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described not turn-knob end is
The position angle get the incident end of the linearly polarized light of π/4, described fast turn-knob end is
The position angle get the exit end of the linearly polarized light of particular value, wherein, ρ revolves distance by the optical fiber that mutarotation changes optical fiber, claps lumped parameter long and the full architectural feature of representative that the optical fiber total length is determined when not revolving.
9. broadband optical-fibre wave plate as claimed in claim 1 is characterized in that, described not turn-knob end is
The incident end of the random linearly polarized light in orientation, described fast turn-knob end is | A
x|
2=| A
y|
2=1/2, the luminous power of Ω=2 θ-pi/2 is along two main shaft five equilibriums and phase differential contains the exit end of two main axis polarized light components of incident angle.
10. broadband optical-fibre wave plate, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is optical fiber 1/2nd wave plates, one end of described optical fiber is fast turn-knob end, the other end is oppositely fast turn-knob end, described optical fiber is gradual gradually along its length direction from fast turn-knob to be turn-knob not, never continue again that turn-knob is oppositely gradual gradually to be fast turn-knob, the incident end that described fast turn-knob end is a linearly polarized light, described oppositely fast turn-knob end is the exit end of linearly polarized light, wherein, when described wave plate changeed an angle, the azimuthal variations that is positioned at the linearly polarized light of exit end was 2 times of wave plate corner.
11. broadband optical-fibre wave plate, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is the optical fiber full-wave plate, one end of described optical fiber is turn-knob end not, the not turn-knob end that the other end goes to zero for turn-knob in the same way, never turn-knob is gradual gradually is fast turn-knob along its length direction for described optical fiber, continue again to be turn-knob not from fast turn-knob is gradual gradually in the same way, described not turn-knob end and in the same way not the turn-knob end be respectively the incident end and the exit end of linearly polarized light, the fast turn-knob of described optical fiber is partly as the senser element of surveying Faraday effect.
12. broadband optical-fibre wave plate, the linear birefringence optical fiber that comprises one section turn-knob, it is characterized in that, described optical-fibre wave plate is an optical fiber mark wave plate, one end of described optical fiber is turn-knob end not, and the other end is a middling speed turn-knob end, and never turn-knob is gradual gradually is the middling speed turn-knob along its length direction for described optical fiber, described not turn-knob end is the incident end of linearly polarized light, and described middling speed turn-knob end is single ellipse intrinsic light.
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|---|---|---|---|
| CNB011126809A CN1173201C (en) | 2001-04-20 | 2001-04-20 | Broadband optical-fibre wave plate with multiple polarization state conversion functions |
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|---|---|---|---|
| CNB011126809A CN1173201C (en) | 2001-04-20 | 2001-04-20 | Broadband optical-fibre wave plate with multiple polarization state conversion functions |
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| US7679753B2 (en) | 2007-06-26 | 2010-03-16 | Huang Hung-Chia | Passively biased fiber-optic gyroscope and current sensor |
| CN101876723A (en) * | 2009-05-19 | 2010-11-03 | 姚竑杰 | Sensing fiber used in reflective all-fiber current sensor |
| CN102393546B (en) * | 2011-10-27 | 2013-11-20 | 黄勇 | Sensing fiber, sensing fiber ring and through-type all-fiber current sensor |
| CN106646731A (en) * | 2015-10-28 | 2017-05-10 | 上海亨通光电科技有限公司 | Broadband fiber wave-plate manufacturing method |
| CN107544113A (en) * | 2017-10-20 | 2018-01-05 | 上海理工大学 | Optical switch device based on Helical Fiber |
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