CN102608706B - Adjustable dispersion compensation device based on LCOS (Liquid Crystal On Silicon) - Google Patents
Adjustable dispersion compensation device based on LCOS (Liquid Crystal On Silicon) Download PDFInfo
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- CN102608706B CN102608706B CN201210120224.7A CN201210120224A CN102608706B CN 102608706 B CN102608706 B CN 102608706B CN 201210120224 A CN201210120224 A CN 201210120224A CN 102608706 B CN102608706 B CN 102608706B
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Abstract
The invention relates to an adjustable dispersion compensation device based on LCOS (Liquid Crystal On Silicon), wherein an input end of a circulator receives a light signal and outputs the light signal to an input end of a single-optical fiber collimator from a first output end, a birefringent crystal, a 1/2 wave plate and a PMD (Polarization Mode Dispersion) compensating gage are sequentially arranged behind the single-optical fiber collimator, a partially reflecting mirror is arranged behind the PMD compensating gage, and the light signal passing the PMD compensating gage is reflected to the partially reflecting mirror with an angle theta, a liquid crystal on silicon parallel to the partially reflecting mirror is arranged behind the partially reflecting mirror, and a first total-reflection mirror and a second total-reflection mirror matched with the partially reflecting mirror and the liquid crystal on silicon are arranged on the front lower side of the partially reflecting mirror. According to the invention, the dispersion toning function is realized by adjusting the phase sizes of different LCOS regions, and the response time of the LCOS phase adjusting operation is at a millisecond level, so that the adjusting is fast; besides, the LCOS serves as a whole to change the voltage of different region pixels so as to adjust the phases of the regions, so that the adjustment is more convenient.
Description
Technical field
The present invention relates to fiber optic communication field, is a kind of based on the LCOS color dispersion compensation device of (liquid crystal on silicon, Liquid Crystal On Silicon are called for short LCOS) specifically.
Background technology
Dispersion makes optical pulse broadening cause producing and disturbing between light pulse, and the error performance of fibre-optic transmission system (FOTS) is degenerated.The about 60km of dispersion limit of 10Gbit/s optical transmission system, compares with 10Gbit/s system, and the dispersion tolerance distance of 40Gbit/s optical transmission system will reduce by 16 times, and dispersion tolerance only has 50ps/nm, is equivalent to the dispersion that 3km single-mode fiber causes.For 40Gbit/s optical transmission system, industry adopts the dispersion compensation module of fixing dispersion values to carry out thick dispersion compensation, and residual dispersion compensates to link to adopt color dispersion compensation device.
U.S. Pat 2003/0210401A1 discloses a kind of cascade GT chamber (Gires-Tournois, a kind of front surface is low anti-, the high anti-etalon in rear surface, be called for short GT chamber) carry out the method for adjustable dispersion compensating, because the tuning of GT chamber needs to adopt thermal control or machinery to control, the adjusting time of dispersion, governing speed was slower in level second.And adopt discrete GT chamber to carry out cascade, and need to mate the parameter in each GT chamber, increase cost of manufacture and difficulty.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of color dispersion compensation device based on LCOS, realize dispersion tuber function by the phase place size that regulates LCOS zones of different, because the response time of LCOS in the time carrying out phase adjusted is at Millisecond, governing speed is very fast; And LCOS does as a wholely, the voltage that changes zones of different pixel just can regulate for the phase place in this region, more convenient than the adjusting in discrete GT chamber.
For reaching above object, the technical scheme that the present invention takes is:
Based on a color dispersion compensation device of LCOS, it is characterized in that, comprising:
The first output terminal 12 is connected to the single optical fiber calibrator input end 21 of single optical fiber calibrator 102 by optical fiber,
Single optical fiber calibrator 102 rears are provided with birefringece crystal 103,1/2 wave plate 104 and PMD compensating plate 105 successively,
Partially reflecting mirror 106 rears are provided with liquid crystal on silicon LCOS 107 in parallel,
Partially reflecting mirror 106 front lower places are provided with the first total reflective mirror 108 and the second total reflective mirror 109 with partially reflecting mirror 106 and liquid crystal on silicon 107 adaptations, and the reflection luminous energy of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again,
The second total reflective mirror 109, for the light signal Yan Yuan road of incident is returned, is finally exported from the second output terminal 13 of circulator.
On the basis of technique scheme, the light path path of the described color dispersion compensation device based on LCOS 100 is:
Light signal is inputted from the circulator input end 11 of circulator 101, export from the first output terminal 12 of circulator 101, the first output terminal 12 of circulator 101 is connected with the single optical fiber calibrator input end 21 use optical fiber of single optical fiber calibrator 102, the light signal of exporting from the first output terminal 12 of circulator 101 incides birefringece crystal 103 after single optical fiber calibrator 102 collimations, birefringece crystal 103 carries out polarization beam splitting to incident optical signal, then be converted into the polarized light of same polarization direction by 1/2 wave plate 104, the PMD through PMD compensating plate 105, birefringece crystal 103 and 1/2 wave plate 104 being brought again compensates, light signal after PMD compensating plate 105 incides partially reflecting mirror 106 with angle θ, light signal is at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and from partially reflecting mirror 106 transmissions, incide the first total reflective mirror 108, the reflected light of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again, at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and again incide the first total reflective mirror 108 from partially reflecting mirror 106 transmissions, light signal is at partially reflecting mirror 106, between liquid crystal on silicon 107 and the first total reflective mirror 108, after multiple reflections transmission, incide the second total reflective mirror 109, the second total reflective mirror 109 returns to the light signal Yan Yuan road of incident, after partially reflecting mirror 106, liquid crystal on silicon 107 and the first total reflective mirror 108 multiple reflections transmissions, get back to PMD compensating plate 105, PMD compensating plate 105 carries out precompensation to the PMD of back light signal, after 1/2 wave plate 104 and birefringece crystal 103 polarization couplings, get back to single optical fiber calibrator 102 again, finally export from the second output terminal 13 of circulator 101.
On the basis of technique scheme, the described complex index of reflection R that incides the multiple-beam interference of light signal multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 of partially reflecting mirror 106 with angle θ represents, from partially reflecting mirror 106 transmissions, the optical path difference of adjacent beams represents with L, the amplitude reflectivity r of partially reflecting mirror 106
1represent the amplitude reflectivity r of liquid crystal on silicon 107
2represent;
The expression formula of complex index of reflection R is:
In formula (1), the wavelength that λ is light signal, ψ is the phase place of complex index of reflection R;
Light signal multiple reflections from partially reflecting mirror 106 transmissions between partially reflecting mirror 106 and liquid crystal on silicon 107, after transmission, light signal has produced group delay GD at different wave length place because of multiple-beam interference, the GD at different wave length place has formed GD curve, and the expression formula of GD is:
In formula (2), GD is ψ diagonal frequencies ω differentiate, and ψ is the phase place of complex index of reflection R, wherein ω=2 π c/ λ, and the wavelength that λ is light signal, c is the light velocity in vacuum;
The peak value size of light signal GD curve is by the amplitude reflectivity r of partially reflecting mirror 106 and liquid crystal on silicon 107
1and r
2determine,
The centre wavelength of light signal GD curve and free spectral limit FSR are determined by the light path between incident angle θ, partially reflecting mirror 106 and liquid crystal on silicon 107, regulate the phase place of liquid crystal on silicon 107 just can change the light path between partially reflecting mirror 106 and liquid crystal on silicon 107, thereby regulate centre wavelength and the FSR of GD curve.
On the basis of technique scheme, the effect of the first described total reflective mirror 108 is to make light signal to pass through successively the zones of different of partially reflecting mirror 106 and liquid crystal on silicon 107, thereby make the GD curve combining producing because of multiple-beam interference between partially reflecting mirror 106 and the zones of different of liquid crystal on silicon 107
Distance between described the first total reflective mirror 108 and partially reflecting mirror 106 is d, and the length of the first total reflective mirror 108 is L ', right
value after rounding is exactly the order of reflection of the first total reflective mirror 108 to light signal; Right
value after rounding is exactly that light signal arrives the second total reflective mirror 109 number of times of GD curve combining before.
On the basis of technique scheme, the effect of the second described total reflective mirror 109 is to make light signal Yan Yuan road to return, and GD curve superposes again, and adjustable dispersion amount doubles.
On the basis of technique scheme, described the first total reflective mirror 108, partially reflecting mirror 106 placement parallel with liquid crystal on silicon 107; The second total reflective mirror 109 and the first total reflective mirror 108 are θ angle and place.
On the basis of technique scheme, the number of times of peak value size, FSR and the GD curve combining of the GD curve that the chromatic dispersion compensation quantity of described color dispersion compensation device 100 and compensation bandwidth are produced by multiple-beam interference between partially reflecting mirror 106 and the zones of different of liquid crystal on silicon 107 determines.
On the basis of technique scheme, in the time that incidence angle θ is zero, the described color dispersion compensation device 100 based on LCOS comprises: light parts 301～30N, partially reflecting mirror 106 and liquid crystal on silicon 107, and N value is the number of times of GD curve combining,
The inner structure of light parts 301～30N is all identical, comprising: circulator 101, single optical fiber calibrator 102, birefringece crystal 103,1/2 wave plate 104 and PMD compensating plate 105.
On the basis of technique scheme, the second output terminal i3 of light parts 30i is connected with optical fiber with the input end i+11 of light parts 30i+1, i=1, and 2 ..., N-1, N;
The light path path of the described color dispersion compensation device based on LCOS 100 is: light signal is inputted from the input end 11 of light parts 301, from the second output terminal N3 output of light parts 30N.
On the basis of technique scheme, when described circulator 101 is for protecting inclined to one side circulator, and described single optical fiber calibrator 102 is that while protecting inclined to one side single optical fiber calibrator, the described color dispersion compensation device 100 based on LCOS comprises:
Protect inclined to one side circulator 501, protect inclined to one side single optical fiber calibrator 502, partially reflecting mirror 106, liquid crystal on silicon 107, the first total reflective mirror 108 and the second total reflective mirror 109;
Light signal is inputted from the input end 11 of protecting inclined to one side circulator 501, export from the first output terminal 12 of protecting inclined to one side circulator 501, the first output terminal 12 of protecting inclined to one side circulator 501 is connected with the input end 21 use optical fiber of protecting inclined to one side single optical fiber calibrator 502, after protecting inclined to one side single optical fiber calibrator 502 collimations, incide partially reflecting mirror 106 with angle θ from protecting the light signal that the first output terminal 12 of inclined to one side circulator 501 exports, light signal is at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and from partially reflecting mirror 106 transmissions, incide the first total reflective mirror 108, the reflected light of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again, at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and again incide the first total reflective mirror 108 from partially reflecting mirror 106 transmissions, light signal is at partially reflecting mirror 106, between liquid crystal on silicon 107 and the first total reflective mirror 108, after multiple reflections transmission, incide the second total reflective mirror 109, the second total reflective mirror 109 returns to the light signal Yan Yuan road of incident, gets back to and protect inclined to one side single optical fiber calibrator 502 after partially reflecting mirror 106, liquid crystal on silicon 107 and the first total reflective mirror 108 multiple reflections transmissions, finally exports from the second output terminal 13 of protecting inclined to one side circulator 501.
Color dispersion compensation device based on LCOS of the present invention, realizes dispersion tuber function by the phase place size that regulates LCOS zones of different, and because the response time of LCOS in the time carrying out phase adjusted is at Millisecond, governing speed is very fast; And LCOS does as a wholely, the voltage that changes zones of different pixel just can regulate for the phase place in this region, more convenient than the adjusting in discrete GT chamber.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 is the structural representation of color dispersion compensation device of the present invention;
Fig. 2 is multiple-beam interference effect schematic diagram between partially reflecting mirror and LCOS.
Fig. 3 is another structural representation of color dispersion compensation device of the present invention;
Fig. 4 is the schematic diagram of one of them unit in another structure of color dispersion compensation device of the present invention;
Fig. 5 is another structural representation of color dispersion compensation device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the color dispersion compensation device based on LCOS of the present invention, is polarization independent type color dispersion compensation device, and the described color dispersion compensation device 100 based on LCOS comprises:
The first output terminal 12 is connected to the single optical fiber calibrator input end 21 of single optical fiber calibrator 102 by optical fiber,
Single optical fiber calibrator 102 rears are provided with birefringece crystal 103,1/2 wave plate 104 and PMD (Polarization Mode Dispersion, polarization mode dispersion are called for short PMD) compensating plate 105 successively,
Partially reflecting mirror 106 rears are provided with liquid crystal on silicon in parallel (LCOS) 107,
Partially reflecting mirror 106 front lower places are provided with the first total reflective mirror 108 and the second total reflective mirror 109 with partially reflecting mirror 106 and liquid crystal on silicon 107 adaptations, and the reflection luminous energy of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again,
The second total reflective mirror 109, for the light signal Yan Yuan road of incident is returned, is finally exported from the second output terminal 13 of circulator.
The light path path of the described color dispersion compensation device based on LCOS 100 is:
Light signal is inputted from the circulator input end 11 of circulator 101, export from the first output terminal 12 of circulator 101, the first output terminal 12 of circulator 101 is connected with the single optical fiber calibrator input end 21 use optical fiber of single optical fiber calibrator 102, the light signal of exporting from the first output terminal 12 of circulator 101 incides birefringece crystal 103 after single optical fiber calibrator 102 collimations, birefringece crystal 103 carries out polarization beam splitting to incident optical signal, then be converted into the polarized light of same polarization direction by 1/2 wave plate 104, the PMD through PMD compensating plate 105, birefringece crystal 103 and 1/2 wave plate 104 being brought again compensates, light signal after PMD compensating plate 105 incides partially reflecting mirror 106 with angle θ, light signal is at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and from partially reflecting mirror 106 transmissions, incide the first total reflective mirror 108, the reflected light of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again, at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and again incide the first total reflective mirror 108 from partially reflecting mirror 106 transmissions, light signal is at partially reflecting mirror 106, between liquid crystal on silicon 107 and the first total reflective mirror 108, after multiple reflections transmission, incide the second total reflective mirror 109, the second total reflective mirror 109 returns to the light signal Yan Yuan road of incident, after partially reflecting mirror 106, liquid crystal on silicon 107 and the first total reflective mirror 108 multiple reflections transmissions, get back to PMD compensating plate 105, PMD compensating plate 105 carries out precompensation to the PMD of back light signal, after 1/2 wave plate 104 and birefringece crystal 103 polarization couplings, get back to single optical fiber calibrator 102 again, finally export from the second output terminal 13 of circulator 101.
The multiple-beam interference schematic diagram of the described light signal multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 that incides partially reflecting mirror 106 with angle θ as shown in Figure 2, wherein:
The complex index of reflection of multiple-beam interference represents with R;
From partially reflecting mirror 106 transmissions, the optical path difference of adjacent beams represents with L, and L is determined by the light path between partially reflecting mirror 106 and liquid crystal on silicon 107;
The amplitude reflectivity R of partially reflecting mirror 106
1represent;
The amplitude reflectivity R of liquid crystal on silicon 107
2represent;
The expression formula of complex index of reflection R is:
In formula (1), the wavelength that λ is light signal, ψ is the phase place of complex index of reflection R.
Light signal multiple reflections from partially reflecting mirror 106 transmissions between partially reflecting mirror 106 and liquid crystal on silicon 107, after transmission, light signal has produced GD (Group Delay because of multiple-beam interference at different wave length place, group delay, is called for short GD), the GD at different wave length place has formed GD curve.The expression formula of GD is
In formula (2), GD is ψ diagonal frequencies ω differentiate, and ψ is the phase place of complex index of reflection R, wherein ω=2 π c/ λ, and the wavelength that λ is light signal, c is the light velocity in vacuum.
From formula (1) and formula (2), the peak value size of light signal GD curve is by the amplitude reflectivity r of partially reflecting mirror 106 and liquid crystal on silicon 107
1and r
2determine; The centre wavelength of light signal GD curve and FSR (Free Spectral Range, free spectral limit are called for short FSR) are determined by the light path between incident angle θ, partially reflecting mirror 106 and liquid crystal on silicon 107.Regulate the phase place of liquid crystal on silicon 107 just can change the light path between partially reflecting mirror 106 and liquid crystal on silicon 107, thereby regulate centre wavelength and the FSR of GD curve.
The effect of the first described total reflective mirror 108 is to make light signal to pass through successively the zones of different of partially reflecting mirror 106 and liquid crystal on silicon 107, thereby make the GD curve combining producing because of multiple-beam interference between partially reflecting mirror 106 and the zones of different of liquid crystal on silicon 107, in order to make the GD curve after stack meet the chromatic dispersion compensation quantity of color dispersion compensation device 100 and the requirement of compensation bandwidth, design centre wavelength and the FSR of each GD curve, regulate the phase place of corresponding with it liquid crystal on silicon 107 zoness of different.
Distance between described the first total reflective mirror 108 and partially reflecting mirror 106 is d, and the length of the first total reflective mirror 108 is L ', right
value after rounding is exactly the order of reflection of the first total reflective mirror 108 to light signal; Right
value after rounding is exactly that light signal arrives the second total reflective mirror 109 number of times of GD curve combining before.
The effect of the second described total reflective mirror 109 is to make light signal Yan Yuan road to return, and GD curve superposes again, and adjustable dispersion amount doubles.
On the basis of technique scheme, described the first total reflective mirror 108, partially reflecting mirror 106 placement parallel with liquid crystal on silicon 107; The second total reflective mirror 109 and the first total reflective mirror 108 are θ angle and place.
On the basis of technique scheme, the number of times of peak value size, FSR and the GD curve combining of the GD curve that the chromatic dispersion compensation quantity of described color dispersion compensation device 100 and compensation bandwidth are produced by multiple-beam interference between partially reflecting mirror 106 and the zones of different of liquid crystal on silicon 107 determines.
On the basis of technique scheme, described color dispersion compensation device 100 is by regulating the phase place of liquid crystal on silicon 107 zoness of different to complete the adjusting of certain bandwidth range internal dispersion compensation rate.
Color dispersion compensation device based on LCOS of the present invention, its structure also can be as shown in Figure 3, Fig. 3 shown device, the special circumstances that essence is exactly is zero when incidence angle θ in Fig. 1 shown device, can cancel in this case the first total reflective mirror 108 and the second total reflective mirror 109, in the time that incidence angle θ is zero, the described color dispersion compensation device 100 based on LCOS comprises:
Light parts 301～30N, partially reflecting mirror 106 and liquid crystal on silicon 107, N value is the number of times of GD curve combining.The inner structure of light parts 301～30N all as shown in Figure 4, comprises circulator 101, single optical fiber calibrator 102, birefringece crystal 103,1/2 wave plate 104 and PMD compensating plate 105.The annexation of circulator 101, single optical fiber calibrator 102, birefringece crystal 103,1/2 wave plate 104 and PMD compensating plate 105, referring to aforementioned (identical with the annexation shown in Fig. 1), no longer describes in detail.
The light path path of the light signal of the described color dispersion compensation device based on LCOS 100 between light parts 301, partially reflecting mirror 106 and liquid crystal on silicon 107 is:
Light signal is inputted from the input end 11 of circulator 101, export from the first output terminal 12 of circulator 101, the first output terminal 12 of circulator 101 is connected with the input end 21 use optical fiber of single optical fiber calibrator 102, the light signal of exporting from the first output terminal 12 of circulator 101 incides birefringece crystal 103 after single optical fiber calibrator 102 collimations, birefringece crystal 103 carries out polarization beam splitting to incident optical signal, then be converted into the polarized light of same polarization direction by 1/2 wave plate 104, the PMD through PMD compensating plate 105, birefringece crystal 103 and 1/2 wave plate 104 being brought again compensates, light signal after PMD compensating plate 105 impinges perpendicularly on partially reflecting mirror 106, light signal is at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and get back to PMD compensating plate 105 from partially reflecting mirror 106 transmissions, PMD compensating plate 105 carries out precompensation to the PMD of back light signal, after 1/2 wave plate 104 and birefringece crystal 103 polarization couplings, get back to single optical fiber calibrator 102, finally export from the second output terminal 13 of circulator.
In the light path path between light parts 302～30N, partially reflecting mirror 106 and liquid crystal on silicon 107 and light signal, the light path class of paths between light parts 301, partially reflecting mirror 106 and liquid crystal on silicon 107 seemingly, repeats no more light signal herein.
When the color dispersion compensation device based on LCOS 100 shown in Fig. 3 is worked, the second output terminal i3 of light parts 30i is connected with optical fiber with the input end i+11 of light parts 30i+1, i=1, and 2 ..., N-1, N.
Specifically: as shown in Figure 3, the second output terminal 13 of light parts 301 is connected with the input end 21 use optical fiber of light parts 302, the second output terminal 23 of light parts 302 is connected with optical fiber with input end 31 ends of light parts 303, operates successively until the second output terminal N-13 of light parts 30N-1 is connected with optical fiber with the input end N1 of light parts 30N.
The light path path of the described color dispersion compensation device based on LCOS 100 is:
Light signal is inputted from the input end 11 of light parts 301, from the second output terminal N3 output of light parts 30N.
The multiple-beam interference schematic diagram of the described light signal that impinges perpendicularly on partially reflecting mirror 106 between partially reflecting mirror 106 and liquid crystal on silicon 107 represent as Fig. 2, and now incidence angle θ is zero, and the expression formula of complex index of reflection R is as shown in formula (1).Because multiple-beam interference has produced GD at different wave length place, the GD at different wave length place has formed GD curve, and the expression formula of GD is as shown in formula (2).Light signal incides the zones of different of liquid crystal on silicon 107 through light parts 301～30N, the number of times of GD curve combining is N, in order to make the GD curve after stack meet the chromatic dispersion compensation quantity of color dispersion compensation device 100 and the requirement of compensation bandwidth, design centre wavelength and the FSR of each GD curve, regulate the phase place of corresponding with it liquid crystal on silicon 107 zoness of different.
The placement parallel with liquid crystal on silicon 107 of described partially reflecting mirror 106.The number of times of peak value size, FSR and the GD curve combining of the GD curve that the chromatic dispersion compensation quantity of described color dispersion compensation device 100 and compensation bandwidth are produced by multiple-beam interference between partially reflecting mirror 106 and the zones of different of liquid crystal on silicon 107 determines.Described color dispersion compensation device 100 is by regulating the phase place of liquid crystal on silicon 107 zoness of different to complete the adjusting of certain bandwidth range internal dispersion compensation rate.
Color dispersion compensation device based on LCOS of the present invention, its structure also can be as shown in Figure 5, and the described color dispersion compensation device 100 based on LCOS comprises:
Protect inclined to one side circulator 501, protect inclined to one side single optical fiber calibrator 502, partially reflecting mirror 106, liquid crystal on silicon 107, the first total reflective mirror 108 and the second total reflective mirror 109.
Light signal is inputted from the input end 11 of protecting inclined to one side circulator 501, export from the first output terminal 12 of protecting inclined to one side circulator 501, the first output terminal 12 of protecting inclined to one side circulator 501 is connected with the input end 21 use optical fiber of protecting inclined to one side single optical fiber calibrator 502, after protecting inclined to one side single optical fiber calibrator 502 collimations, incide partially reflecting mirror 106 with angle θ from protecting the light signal that the first output terminal 12 of inclined to one side circulator 501 exports, light signal is at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and from partially reflecting mirror 106 transmissions, incide the first total reflective mirror 108, the reflected light of the first total reflective mirror 108 incides partially reflecting mirror 106 with angle θ again, at multiple reflections between partially reflecting mirror 106 and liquid crystal on silicon 107 and again incide the first total reflective mirror 108 from partially reflecting mirror 106 transmissions, light signal is at partially reflecting mirror 106, between liquid crystal on silicon 107 and the first total reflective mirror 108, after multiple reflections transmission, incide the second total reflective mirror 109, the second total reflective mirror 109 returns to the light signal Yan Yuan road of incident, gets back to and protect inclined to one side single optical fiber calibrator 502 after partially reflecting mirror 106, liquid crystal on silicon 107 and the first total reflective mirror 108 multiple reflections transmissions, finally exports from the second output terminal 13 of protecting inclined to one side circulator 501.
The described polarization relationship type color dispersion compensation device based on LCOS requires the polarization signal of incident optical signal consistent with the slow axis of protecting inclined to one side circulator 501.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.The content not being described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
The content not being described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. the color dispersion compensation device based on LCOS, is characterized in that, comprising:
Circulator (101), its circulator input end (11) receiving optical signals, and light signal is exported from the first output terminal (12), described circulator (101) is also provided with the second output terminal (13),
The first output terminal (12) is connected to the single optical fiber calibrator input end (21) of single optical fiber calibrator (102) by optical fiber,
Single optical fiber calibrator (102) rear is provided with birefringece crystal (103), 1/2 wave plate (104) and PMD compensating plate (105) successively,
PMD compensating plate (105) rear is provided with partially reflecting mirror (106), and light signal after PMD compensating plate (105) incides partially reflecting mirror (106) with angle θ,
Partially reflecting mirror (106) rear is provided with liquid crystal on silicon LCOS(107 in parallel),
Partially reflecting mirror (106) front lower place is provided with the first total reflective mirror (108) and the second total reflective mirror (109) with partially reflecting mirror (106) and liquid crystal on silicon (107) adaptation, and the reflection luminous energy of the first total reflective mirror (108) incides partially reflecting mirror (106) with angle θ again
The second total reflective mirror (109), for the light signal Yan Yuan road of incident is returned, is finally exported from second output terminal (13) of circulator.
2. the color dispersion compensation device based on LCOS as claimed in claim 1, is characterized in that, the light path path of the described color dispersion compensation device based on LCOS (100) is:
Light signal is from circulator input end (11) input of circulator (101), from the first output terminal (12) output of circulator (101), first output terminal (12) of circulator (101) is connected with optical fiber with the single optical fiber calibrator input end (21) of single optical fiber calibrator (102), the light signal of exporting from first output terminal (12) of circulator (101) incides birefringece crystal (103) after single optical fiber calibrator (102) collimation, birefringece crystal (103) carries out polarization beam splitting to incident optical signal, then be converted into the polarized light of same polarization direction by 1/2 wave plate (104), passing through the PMD that PMD compensating plate (105) brings birefringece crystal (103) and 1/2 wave plate (104) compensates again, light signal after PMD compensating plate (105) incides partially reflecting mirror (106) with angle θ, light signal is at multiple reflections between partially reflecting mirror (106) and liquid crystal on silicon (107) and incide the first total reflective mirror (108) from partially reflecting mirror (106) transmission, the reflected light of the first total reflective mirror (108) incides partially reflecting mirror (106) with angle θ again, at multiple reflections between partially reflecting mirror (106) and liquid crystal on silicon (107) and again incide the first total reflective mirror (108) from partially reflecting mirror (106) transmission, light signal is in partially reflecting mirror (106), between liquid crystal on silicon (107) and the first total reflective mirror (108), after multiple reflections transmission, incide the second total reflective mirror (109), the second total reflective mirror (109) returns to the light signal Yan Yuan road of incident, after partially reflecting mirror (106), liquid crystal on silicon (107) and the first total reflective mirror (108) multiple reflections transmission, get back to PMD compensating plate (105), PMD compensating plate (105) carries out precompensation to the PMD of back light signal, after 1/2 wave plate (104) and birefringece crystal (103) polarization coupling, get back to single optical fiber calibrator (102) again, finally export from second output terminal (13) of circulator (101).
3. the color dispersion compensation device based on LCOS as claimed in claim 2, it is characterized in that: the described complex index of reflection R that incides light signal multiple-beam interference of multiple reflections between partially reflecting mirror (106) and liquid crystal on silicon (107) of partially reflecting mirror (106) with angle θ represents, from partially reflecting mirror (106) transmission, the optical path difference of adjacent beams represents with L, the amplitude reflectivity r of partially reflecting mirror (106)
1represent the amplitude reflectivity r of liquid crystal on silicon (107)
2represent;
The expression formula of complex index of reflection R is:
In formula (1), the wavelength that λ is light signal, ψ is the phase place of complex index of reflection R;
Light signal multiple reflections from partially reflecting mirror (106) transmission between partially reflecting mirror (106) and liquid crystal on silicon (107), after transmission, light signal has produced group delay GD at different wave length place because of multiple-beam interference, the GD at different wave length place has formed GD curve, and the expression formula of GD is:
In formula (2), GD is ψ diagonal frequencies ω differentiate, and ψ is the phase place of complex index of reflection R, wherein ω=2 π c/ λ, and the wavelength that λ is light signal, c is the light velocity in vacuum;
The peak value size of light signal GD curve determines by the amplitude reflectivity r1 of partially reflecting mirror (106) and liquid crystal on silicon (107) and r2,
The centre wavelength of light signal GD curve and free spectral limit FSR are determined by the light path between incident angle θ, partially reflecting mirror (106) and liquid crystal on silicon (107), regulate the phase place of liquid crystal on silicon (107) just can change the light path between partially reflecting mirror (106) and liquid crystal on silicon (107), thereby regulate centre wavelength and the FSR of GD curve.
4. the color dispersion compensation device based on LCOS as claimed in claim 3, it is characterized in that: the effect of described the first total reflective mirror (108) is to make light signal to pass through successively the zones of different of partially reflecting mirror (106) and liquid crystal on silicon (107), thereby make the GD curve combining producing because of multiple-beam interference between partially reflecting mirror (106) and the zones of different of liquid crystal on silicon (107)
Distance between described the first total reflective mirror (108) and partially reflecting mirror (106) is d, and the length of the first total reflective mirror (108) is L ', right
value after rounding is exactly the order of reflection of the first total reflective mirror (108) to light signal; Right
value after rounding is exactly that light signal arrives the second total reflective mirror (109) number of times of GD curve combining before.
5. the color dispersion compensation device based on LCOS as claimed in claim 3, is characterized in that: the effect of described the second total reflective mirror (109) is to make light signal Yan Yuan road to return, and GD curve superposes again, and adjustable dispersion amount doubles.
6. the color dispersion compensation device based on LCOS as claimed in claim 1, is characterized in that: described the first total reflective mirror (108), partially reflecting mirror (106) and the parallel placement of liquid crystal on silicon (107); The second total reflective mirror (109) is θ angle with the first total reflective mirror (108) and places.
7. the color dispersion compensation device based on LCOS as claimed in claim 1, is characterized in that: the number of times of peak value size, FSR and the GD curve combining of the GD curve that the chromatic dispersion compensation quantity of described color dispersion compensation device (100) and compensation bandwidth are produced by multiple-beam interference between partially reflecting mirror (106) and the zones of different of liquid crystal on silicon (107) determines.
8. the color dispersion compensation device based on LCOS as claimed in claim 1, it is characterized in that: in the time that incidence angle θ is zero, the described color dispersion compensation device (100) based on LCOS comprising: N light parts (301～30N), partially reflecting mirror (106) and liquid crystal on silicon (107), N value is the number of times of GD curve combining
The inner structure of N light parts (301～30N) is all identical, comprising: circulator (101), single optical fiber calibrator (102), birefringece crystal (103), 1/2 wave plate (104) and PMD compensating plate (105).
9. the color dispersion compensation device based on LCOS as claimed in claim 8, it is characterized in that: second output terminal (i3) of i light parts (30i) is connected with optical fiber with the input end (i+11) of i+1 light parts (30i+1), i=1,2,, N-1;
The light path path of the described color dispersion compensation device based on LCOS (100) is: light signal is from input end (11) input of light parts (301), from the second output terminal (N3) output of light parts (30N).
10. the color dispersion compensation device based on LCOS as claimed in claim 1, it is characterized in that: when described circulator (101) is for protecting inclined to one side circulator, and described single optical fiber calibrator (102) is that while protecting inclined to one side single optical fiber calibrator, the described color dispersion compensation device (100) based on LCOS comprising:
Protect inclined to one side circulator (501), protect inclined to one side single optical fiber calibrator (502), partially reflecting mirror (106), liquid crystal on silicon (107), the first total reflective mirror (108) and the second total reflective mirror (109);
Light signal is from protecting input end (11) input of inclined to one side circulator (501), from protecting the first output terminal (12) output of inclined to one side circulator (501), the first output terminal (12) of protecting inclined to one side circulator (501) is connected with optical fiber with the input end (21) of protecting inclined to one side single optical fiber calibrator (502), after protecting inclined to one side single optical fiber calibrator (502) collimation, incide partially reflecting mirror (106) with angle θ from the light signal of the first output terminal (12) output of protecting inclined to one side circulator (501), light signal is at multiple reflections between partially reflecting mirror (106) and liquid crystal on silicon (107) and incide the first total reflective mirror (108) from partially reflecting mirror (106) transmission, the reflected light of the first total reflective mirror (108) incides partially reflecting mirror (106) with angle θ again, at multiple reflections between partially reflecting mirror (106) and liquid crystal on silicon (107) and again incide the first total reflective mirror (108) from partially reflecting mirror (106) transmission, light signal is in partially reflecting mirror (106), between liquid crystal on silicon (107) and the first total reflective mirror (108), after multiple reflections transmission, incide the second total reflective mirror (109), the second total reflective mirror (109) returns to the light signal Yan Yuan road of incident, after partially reflecting mirror (106), liquid crystal on silicon (107) and the first total reflective mirror (108) multiple reflections transmission, get back to and protect inclined to one side single optical fiber calibrator (502), finally from protecting the second output terminal (13) output of inclined to one side circulator (501).
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| CN104570221B (en) * | 2014-12-26 | 2018-05-08 | 武汉光迅科技股份有限公司 | A kind of flexible grid color dispersion compensation device based on liquid crystal array |
| CN106329305A (en) * | 2016-08-23 | 2017-01-11 | 中国科学院上海光学精密机械研究所 | Dispersion compensation device capable of realizing rapid tuning based on parallel grating pair |
| CN113156675B (en) * | 2020-01-22 | 2023-04-11 | 华为技术有限公司 | Driving method, phase adjusting device, driving equipment and chip of liquid crystal on silicon |
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| JP4885996B2 (en) * | 2009-03-23 | 2012-02-29 | 日本電信電話株式会社 | Dispersion compensator |
| CN102096217B (en) * | 2010-12-03 | 2012-11-07 | 武汉光迅科技股份有限公司 | Adjustable dispersion compensation device based on liquid crystal array technology |
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