CN202077029U - DQPSK demodulation device - Google Patents
DQPSK demodulation device Download PDFInfo
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- CN202077029U CN202077029U CN2011201418134U CN201120141813U CN202077029U CN 202077029 U CN202077029 U CN 202077029U CN 2011201418134 U CN2011201418134 U CN 2011201418134U CN 201120141813 U CN201120141813 U CN 201120141813U CN 202077029 U CN202077029 U CN 202077029U
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Abstract
The utility model relates to a DQPSK (differential quaternary phase-shift keying) demodulation device. The DQPSK demodulation device is characterized in that a single-fiber collimator (1), a first beam shift device (2), a first wave plate (3), a second wave plate (4), a second beam shift device (5) and a third wave plate (6) are arranged in sequence; a beam-split and beam-combining device consisting of a first reflector (7), a polarization beam splitting plate (8), a fourth wave plate (9), a first phase shift device (10), a second phase shift device (11) and a second reflector (12) is used for distributing a polarized light into two interference arms to generate an optical path difference; a fifth wave plate (13) is positioned below the polarization beam splitting plate (8); a polarization beam splitter (14) is positioned on one side of the light output face of the fifth wave plate (13); and a third reflector (15) and a sixth wave plate (16) face two light output faces of the polarization beam splitter (14) respectively. The DQPSK demodulation device has a small size and low manufacturing cost.
Description
Technical field
The utility model relates to a kind of demodulating equipment, especially relates to a kind of realization equation of light branch Quadrature Phase Shift Keying (DQPSK, Differential Quaternary Phase-Shift Keying) modulation signal demodulating device.
Background technology
Development along with the communications industry, the signal modulation system of high noise immunity, high transfer rate is that communication system supplier realizes constantly pursuit of remote optical communication transmission, and the DQPSK modulation signal has higher tolerance for noise, nonlinear effect and coherent crosstalk, and the time the present unique modulation technique that can in the system of 50GHz channel spacing, finish the 40Gb/s rate processing.
The DQPSK modulation signal must have corresponding demodulating equipment to carry out demodulation and receive and received information is recovered out signal, " a kind of mode and device thereof of realizing the DQPSK demodulation " as Chinese patent 200110071584.6 announcements, must utilize the demodulation of two cover DPSK demodulating equipments realizations to the DQPSK signal, thereby make that not only the demodulated equipment volume is bigger, and corresponding manufacturing cost improves greatly also.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of and only utilizes same set of DPSK demodulating equipment to realize demodulation of DQPSK signal and volume DQPSK demodulating equipment small and exquisite, cheap for manufacturing cost.
The purpose of this utility model is achieved in that a kind of DQPSK demodulating equipment, and described device includes single fiber collimater, first and moves bundle device, first wave plate, second wave plate, second and move bundle device, the 3rd wave plate, speculum one, polarization spectro sheet, the 4th wave plate, phase-shifter one, phase-shifter two, speculum the two, the 5th wave plate, polarizing beam splitter, speculum the three, the 6th wave plate, the 3rd and move bundle device, prism one, double-fiber collimator the one, the 7th wave plate, the 8th wave plate, the 4th and move bundle device and prism two and double-fiber collimator two;
Described single fiber collimater, first moves the bundle device, first wave plate, second wave plate, second moves bundle device and the 3rd wave plate is arranged in order, oblique exiting surface one side that is arranged at the 3rd wave plate of described polarization spectro sheet, described speculum one is positioned at the top of the 3rd wave plate, and the 3rd wave plate and speculum one be arranged in parallel, described the 4th wave plate is positioned at exiting surface one side of speculum one and polarization spectro sheet, described speculum two is positioned at exiting surface one side of the 4th wave plate, described phase-shifter one and phase-shifter two are between the 4th wave plate and speculum two, described the 5th wave plate is positioned at the below of polarization spectro sheet, and described polarizing beam splitter is positioned at exiting surface one side of the 5th wave plate;
Described speculum three and the 6th wave plate are respectively over against two exiting surfaces of polarizing beam splitter, described the 6th wave plate, the 3rd moves exiting surface one side that bundle device, prism one and double-fiber collimator one are positioned at speculum three successively, and described the 7th wave plate, the 8th wave plate, the 4th move exiting surface one side that bundle device and prism two and double-fiber collimator two are positioned at speculum three successively.
Compared with prior art, the beneficial effects of the utility model are:
The utility model is compared with the demodulating equipment of announcement in the patent 200110071584.6, the shared single fiber collimater of two ends DPSK, first is moved bundle device, first wave plate, second wave plate, second moves bundle device, the 3rd wave plate, speculum one, polarization spectro sheet, the 4th wave plate, phase-shifter one, phase-shifter two and speculum 2 12, only to the rear end Z-direction is closed the light time just with two cover DPSK separately; Significantly reduced number of devices after shared, not only reduced volume, and can effectively reduce cost.
Description of drawings
Fig. 1 is the structural representation of a kind of DQPSK demodulating equipment of the utility model.
Wherein:
Embodiment
Referring to Fig. 1, a kind of DQPSK demodulating equipment that the utility model relates to, described device includes single fiber collimater 1, first moves bundle device 2, first wave plate 3, second wave plate 4, second moves bundle device 5, the 3rd wave plate 6, speculum 1, polarization spectro sheet 8, the 4th wave plate 9, phase-shifter 1, phase-shifter 2 11, speculum 2 12, the 5th wave plate 13, polarizing beam splitter 14, speculum 3 15, the 6th wave plate 16, the 3rd moves bundle device 17, prism 1, double-fiber collimator 1, the 7th wave plate 20, the 8th wave plate 21, the 4th moves bundle device 22 and prism 2 23 and double-fiber collimator 2 24
Described first moves exiting surface one side that bundle device 2 is positioned at single fiber collimater 1, light beam enters first and moves bundle device 2 after single fiber collimater 1, and on the Z direction, be divided into two bunch polarised lights, described first wave plate 3 and second wave plate 4 are positioned at first exiting surface one side of moving bundle device 2 successively, and first wave plate 3 only covers a branch of in the two bunch polarised lights, described second moves exiting surface one side that bundle device 5 is positioned at second wave plate 4, light beam moves bundle device 5 through second and be divided into two-beam on directions X, described the 3rd wave plate 6 is positioned at second exiting surface one side of moving bundle device 5, described polarization spectro sheet 8 oblique exiting surface one sides that are arranged at the 3rd wave plate 6, described speculum 1 is positioned at the top of the 3rd wave plate 6, and the 3rd wave plate 6 and speculum 1 be arranged in parallel, described the 4th wave plate 9 is positioned at exiting surface one side of speculum 1 and polarization spectro sheet 8, described speculum 2 12 is positioned at exiting surface one side of the 4th wave plate 9, described phase-shifter 1 and phase-shifter 2 11 are between the 4th wave plate 9 and speculum 2 12, and cover two-way respectively and interfere arm, described speculum 1, polarization spectro sheet 8, the 4th wave plate 9, phase-shifter 1, the beam split Multiplexing apparatus that phase-shifter 2 11 and speculum 2 12 constitute is used for that polarised light is assigned to two-way and interferes arm to form optical path difference, described optical path difference depends on the distance between speculum 1 and the polarization spectro sheet 8, distance between speculum 1 and polarization spectro sheet 8 and the speculum 2 12 and the 4th wave plate 9, the thickness of phase-shifter 1 and phase-shifter 2 11, described the 5th wave plate 13 is positioned at the below of polarization spectro sheet 8, and described polarizing beam splitter 14 is positioned at exiting surface one side of the 5th wave plate 13;
Described speculum 3 15 and the 6th wave plate 16 are respectively over against two exiting surfaces of polarizing beam splitter 14, described the 6th wave plate the 16, the 3rd moves exiting surface one side that bundle device 17, prism 1 and double-fiber collimator 1 are positioned at speculum 3 15 successively, and described the 7th wave plate 20, the 8th wave plate the 21, the 4th move exiting surface one side that bundle device 22 and prism 2 23 and double-fiber collimator 2 24 are positioned at speculum 3 15 successively.
More than be incident beam and outgoing beam respectively in the situation at two ends, special, when requiring incident beam and outgoing beam, can between the 3rd wave plate 6 and speculum 1, insert speculum change beam direction at same end.
Claims (1)
1. DQPSK demodulating equipment, it is characterized in that: described device includes single fiber collimater (1), first moves bundle device (2), first wave plate (3), second wave plate (4), second moves bundle device (5), the 3rd wave plate (6), speculum one (7), polarization spectro sheet (8), the 4th wave plate (9), phase-shifter one (10), phase-shifter two (11), speculum two (12), the 5th wave plate (13), polarizing beam splitter (14), speculum three (15), the 6th wave plate (16), the 3rd moves bundle device (17), prism one (18), double-fiber collimator one (19), the 7th wave plate (20), the 8th wave plate (21), the 4th moves bundle device (22) and prism two (23) and double-fiber collimator two (24);
Described single fiber collimater (1), first moves bundle device (2), first wave plate (3), second wave plate (4), second moves bundle device (5) and the 3rd wave plate (6) is arranged in order, oblique exiting surface one side that is arranged at the 3rd wave plate (6) of described polarization spectro sheet (8), described speculum one (7) is positioned at the top of the 3rd wave plate (6), and the 3rd wave plate (6) and speculum one (7) be arranged in parallel, described the 4th wave plate (9) is positioned at exiting surface one side of speculum one (7) and polarization spectro sheet (8), described speculum two (12) is positioned at exiting surface one side of the 4th wave plate (9), described phase-shifter one (10) and phase-shifter two (11) are positioned between the 4th wave plate (9) and the speculum two (12), described the 5th wave plate (13) is positioned at the below of polarization spectro sheet (8), and described polarizing beam splitter (14) is positioned at exiting surface one side of the 5th wave plate (13);
Described speculum three (15) and the 6th wave plate (16) are respectively over against two exiting surfaces of polarizing beam splitter (14), described the 6th wave plate (16), the 3rd moves exiting surface one side that bundle device (17), prism one (18) and double-fiber collimator one (19) are positioned at speculum three (15) successively, and described the 7th wave plate (20), the 8th wave plate (21), the 4th move exiting surface one side that bundle device (22) and prism two (23) and double-fiber collimator two (24) are positioned at speculum three (15) successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201418134U CN202077029U (en) | 2011-05-06 | 2011-05-06 | DQPSK demodulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201418134U CN202077029U (en) | 2011-05-06 | 2011-05-06 | DQPSK demodulation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202077029U true CN202077029U (en) | 2011-12-14 |
Family
ID=45115105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201418134U Expired - Fee Related CN202077029U (en) | 2011-05-06 | 2011-05-06 | DQPSK demodulation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202077029U (en) |
-
2011
- 2011-05-06 CN CN2011201418134U patent/CN202077029U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20130506 |