CN2322325Y - Non-balance Mach-Zehnder optical fibre interference wave-division multiplex device - Google Patents
Non-balance Mach-Zehnder optical fibre interference wave-division multiplex device Download PDFInfo
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- CN2322325Y CN2322325Y CN 97242764 CN97242764U CN2322325Y CN 2322325 Y CN2322325 Y CN 2322325Y CN 97242764 CN97242764 CN 97242764 CN 97242764 U CN97242764 U CN 97242764U CN 2322325 Y CN2322325 Y CN 2322325Y
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Abstract
The utility model relates to a fiber interference wave-division multiplex device of an optical system, namely a non-balance Mach-Zehnder fiber interference wave-division multiplex device. The non-balance Mach-Zehnder fiber interference wave-division multiplex device is composed of a pair of broadband (3dB) fiber couplers 1, a pair of fiber interference arms 2 and one temperature compensation substrate 3, namely the pair of broadband (3dB) fiber couplers 1 are in mutual cascade with the pair of fiber interference arms 2, and two fiber interference arms 2 of unequal optical lengths and the wide band (3dB) fiber couplers are together formed into the non-balance Mach-Zehnder fiber interference wave-division multiplex device. The utility model has the advantages of novel and simple structure, advanced technologies, stable performance and small transmission loss, and is the fiber interference wave-division multiplex device which has high isolation degrees in different wavebands.
Description
The utility model relates to a kind of fiber optic interferometric wavelength division multiplexer of optical system, more particularly belongs to a kind of non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer.
At present, wavelength division multiplexer (WDM) has been widely used in the fiber-optic signal transmission system, as system information dilatation device, its action principle is transmitted in the same optical fiber for the light signal of different-waveband that will transmit in the multifiber merges to, before reception, again the separate optical signals of the different-waveband that transmits in the same optical fiber is come, in different fiber, transmit respectively and receive, can make light signal transmission system under the condition that does not increase number of fibers, enlarge transmission capacity like this, thereby be most economical effective method, the dilatation multiplying power depends on the fiber amplifier spectral bandwidth and the number of active lanes of decision fiber optic transmission system bandwidth, the former is usually about 30nm (nanometer), the latter is depended on channel center wavelength minimum interval again, or unit wavelength interval internal channel number, i.e. channel density.
High-density wavelength division multiplexer (DWDM) is meant the wavelength division multiplexer of channel center wavelength interval less than 3.2nm (nanometer), it can be made with the interferometric filter serial connection, also can make with melting cone type wavelength division multiplexer serial connection, it is little that the latter has loss, the advantage that price is low, this has been to describe in " pyrometric cone high density wave divided multiplexing device " at our patent name, this number of patent application is 96116575.8, publication number is CN 11529A, this technology is that multistage multiwindow wavelength division multiplexer cascade is constituted high-density wavelength division multiplexer, because awl district is very thin when very long, the influence of internal stress inhomogeneities and thermal change relaxation process, the multistage multiwindow wavelength division multiplexer of making is not only more crisp, and passband drift for a long time, make that minimum window at interval can not be too little, thereby the density of the high-density wavelength division multiplexer that forms in order to serial connection can not be very high.
The purpose of this utility model is to intend providing a kind of non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer (MZ-WDM) at the weak point of above high-density wavelength division multiplexer, adopts Mach melting cone type wavelength division multiplexer serial connection technology to make multistage multiwindow wavelength division multiplexer.A lot of the little passage optical bands (window) of loss are arranged in its two branched bottoms, the isolation of different-waveband can be very high, and it is reliable and stable, its architectural feature is by a pair of broadband (3dB) fiber coupler serial cascade and a pair of fiber optic interferometric arm, it is positioned between two fiber coupler serial connection ports, and have the optical length that does not wait, and a temperature-compensating substrate that is used for fixing the fiber optic interferometric arm constitutes.The utility model is a novelty simple in structure, advanced technology, reliable and stable, loss is little, the isolation of different-waveband is very high fiber optic interferometric wavelength division multiplexer.
The utility model is to realize like this, design a kind of non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer, it is by a pair of broadband (3dB) fiber coupler serial cascade and a pair of fiber optic interferometric arm each other, it is positioned between two fiber coupler serial connection ports, and have the optical length that does not wait, and a temperature-compensating substrate that is used for fixing the fiber optic interferometric arm constitutes.
At first, with mutual serial cascade of a pair of broadband (3dB) fiber coupler and the mutual cascade of a pair of fiber optic interferometric arm, the two fiber optic interferometric arms that optical length does not wait constitute non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer with a pair of broadband optical fiber coupler, and the fiber optic interferometric arm that is preset with internal stress in the optical fiber adopts the temperature-compensating substrate to fix.Be divided into two bundle light signals and in two optical fiber, transmit respectively when first fiber coupler receives light signal from input port, behind above-mentioned two optical fiber that the logical optical length of this two bundles light signal does not wait, in another fiber coupler, merge and the generation interference effect, be assigned in the output port by different transmission regions then and transmit, form the wavelength division multiplexer of a multiwindow.
The transmission spectrum characteristic of this multiwindow wavelength division multiplexer, as shown in Figure 3.
Wherein solid line is the curve of spectrum of input port to a branch of light signal transmitance of output port, and dotted line is the curve of spectrum of input port to the transmitance of another bundle light signal of output port.
Two optical fiber between two interconnected ports of broadband optical fiber coupler constitute two fiber optic interferometric arms of non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer, we are called long-armed optical fiber and galianconism optical fiber, because the length of long-armed optical fiber and galianconism optical fiber is unequal, so cause its optical path difference, and in the output of two output ports formation multiwindow wavelength division multiplexing, in bifurcating channel, adjacent two passage optical band centre wavelengths at interval, be called channel spacing, it can be represented by the formula:
Wherein λ is a passage light wave centre wavelength, and n is an optical fibre refractivity, 1
1With 1
2Be respectively the length of two fiber optic interferometric arms, the interval of adjacency channel optical band centre wavelength is called window interval in the same passage, and window interval is two times of above-mentioned channel spacing.
Be shaped on two rigidity bonding fixing points on one of them galianconism optical fiber of two fiber optic interferometric arms, methods such as its available heat-curable glue, ultra-violet curing glue or laser welding are made.
The temperature-compensating substrate, usually adopt aluminium or stainless steel, because its thermal coefficient of expansion is bigger than quartzy, thereby variations in temperature is big, the internal stress that the phenomenon of expanding with heat and contract with cold will be preset in galianconism optical fiber changes, then cause refraction index changing, because the change of refractive index makes the change of the long-armed optical path difference with the optical fiber galianconism of the optical fiber of fiber optic interferometric, and the change that optical fiber length variations long-armed and the optical fiber galianconism is caused is then opposite.Two bonding fixing points of the galianconism of fiber optic interferometric arm adopt and play rubber formation, therefore, as long as suitably adjust two distances between the bonding fixing point according to selected temperature-compensating backing material, two fiber optic interferometric arm optical path differences are not varied with temperature, to obtain temperature independent wavelength division multiplexing characteristic.
Another kind of implementation, it is the shell that two broadbands (3dB) coupler is all selected the high thermal expansion coefficient material for use, be fixed on the temperature-compensating substrate that the low thermal coefficient of expansion material makes, once more, before two optical fiber of a pair of fiber optic interferometric arm 2 of bonding, in two fiber optic interferometric arms, apply earlier a stress, the equal in length of two fiber optic interferometric arms, adopt the sensitive optical fiber of ultraviolet to make to fiber optic interferometric arm wherein, promptly be exposed to optical fibre refractivity increase in the ultraviolet light, and after removing ultraviolet light, optical fibre refractivity maintains increases later numerical value, as long as suitably adjust UV-irradiation dosage and the irradiated length of this root optical fiber, the optical path difference of two fiber optic interferometric arms that can obtain to expect, so that obtain the channel spacing of multiple expection, as following formulate:
Wherein Δ λ is a channel spacing, Δ n and Δ 1 be optical fiber by UV-irradiation after, be respectively the variation of illuminated optical fibre refractivity and by the length at UV-irradiation position.
Above device all adopts rigidity bonding fixing point, is fixed on the temperature-compensating substrate.
As long as select for use the length of suitable backing material and two fiber optic interferometric arms of setting just can obtain good temperature compensation function, thereby the optical path difference of two fiber optic interferometric arms does not change with variation of temperature.
Among above-mentioned two embodiment, first embodiment is easy to realize big optical path difference, but be difficult to accurate its numerical value of control, but the latter can accurately adjust optical path difference numerical value, but obtain big optical path difference, enlarge illumination length, not only apparatus expensive, and time-consuming also many, as the two combination can be obtained better effect.
Below in conjunction with accompanying drawing embodiment, the utility model structure is elaborated.
Fig. 1 is that not isometric non-equilibrium Mach-Zehnder optical fiber is interfered the multiple device structural representation of wavelength-division.
Fig. 2 is that isometric non-equilibrium Mach-Zehnder optical fiber is interfered the multiple device structural representation of wavelength-division.
Fig. 3 is the transmission spectrum characteristic of multiwindow wavelength division multiplexer.
The drawing explanation:
The 1-broadband optical fiber coupler, 2-fiber optic interferometric arm, 3-temperature-compensating substrate, 4-shell, 11-optical fiber, another optical fiber of 12-, 13, the 14-fixing point that bonds, 15-input port, 16-output port.
Consult shown in Figure 1, non-equilibrium Mach-Zehnder optical fiber is interfered the multiple device of wavelength-division, its structure is by a pair of broadband (3dB) fiber coupler 1 mutual serial cascade and a pair of fiber optic interferometric arm 2, it is positioned between two fiber couplers, 1 serial connection port, and has the optical length that does not wait, and a temperature-compensating substrate 3 that is used for fixing fiber optic interferometric arm 2 constitutes, at first will be to a broadband (3dB) fiber coupler 1 mutual serial cascade, and with a pair of fiber optic interferometric arm 2 mutual cascades, the two fiber optic interferometric arms 2 that optical length does not wait constitute non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer with a pair of broadband optical fiber coupler 1, the fiber optic interferometric arm 2 that is preset with internal stress in the optical fiber adopts temperature-compensating substrate 3 fixing, be divided into two bundle light signals and in two optical fiber, transmit respectively when first fiber coupler 1 receives light signal from input port 15, after this two bundles light signal passes through not isometric above-mentioned two optical fiber of optical length, in another fiber coupler 1, merge and the generation interference effect, be assigned to transmission in the output port 16 by different transmission regions then, form a multiwindow wavelength division multiplexer.
Broadband (3dB) fiber coupler 1 can be a fused-tapered fiber coupler, the micro-optic fiber coupler that semi-transparent semi-reflecting film constitutes, or optical-waveguide-type fiber coupler and other fiber coupler.
Has the not fiber optic interferometric arm 2 of isometric optical length, it can adopt unequal length but two equal optical fiber of refractive index, also can adopt equal length but unequal two optical fiber of refractive index, or unequal length, two optical fiber that refractive index is also different, and other is enough to form any two incompatible formations of optical fibre set of unequal length light path.
The fiber optic interferometric arm 2 of two optical fiber combination that refractive index is different can at first select for use two optical fiber of different refractivity to make up, after also can adopting two identical optical fiber combination of refractive index, adopting UV-irradiation to form refractive index again in two optical fiber does not wait, after two optical fiber perhaps selecting for use refractive index not wait make up, adopt UV-irradiation to adjust the refractive index difference of two optical fiber again.
The fiber optic interferometric arm 2 of two optical fiber combination of unequal length can adopt fusion mode its corresponding optical fiber that stretches, and forms unequal length, the property adjusted stretching at room temperature again.
Temperature-compensating substrate 3 has negative temperature coefficient at the gap length of two fixing points, 13,14 fixing 2, two fixing points of isometric fiber optic interferometric arm.
The utility model has the advantages that clearly, it be novelty simple in structure, advanced technology, stable and reliable for performance, Loss is little, at the very high fiber optic interferometric wavelength division multiplexer of the isolation of different-waveband.
Claims (7)
1. a non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer is characterized in that it is by a pair of broadband (3dB) fiber coupler (1), and an a pair of fiber optic interferometric arm (2) and a temperature-compensating substrate (3) constitute.Wherein:
A pair of broadband (3dB) fiber coupler (1) and a pair of fiber optic interferometric arm (2) cascade mutually, the two fiber optic interferometric arms (2) that optical length does not wait constitute non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer with broadband (3dB) fiber coupler, and the fiber optic interferometric arm (2) that is preset with internal stress in optical fiber adopts the temperature-compensating substrate to fix.
2. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 1, it is characterized in that broadband (3dB) fiber coupler (1) is a fused-tapered fiber coupler, the micro-optic fiber coupler that semi-transparent semi-reflecting film constitutes, or optical-waveguide-type fiber coupler and other fiber coupler.
3. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 1, it is characterized in that having the not fiber optic interferometric arm (2) of isometric optical length, it can adopt unequal length but two equal optical fiber of refractive index, also can adopt equal length but two optical fiber that refractive index does not wait or unequal length, two optical fiber that refractive index is also different, and other is enough to form any two incompatible formations of optical fibre set of unequal length light path.
4. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 3, it is characterized in that two different optical fiber combination of refractive index can at first select for use two optical fiber of different refractivity to make up, also can adopt and adopt UV-irradiation in two optical fiber, to form refractive index again after two identical optical fiber combination of refractive index not wait, after two optical fiber perhaps selecting for use refractive index not wait make up, adopt UV-irradiation to adjust the refractive index difference of two optical fiber again.
5. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 3, two optical fiber combination that it is characterized in that unequal length can adopt fusion mode its corresponding optical fiber that stretches, and form unequal length, the property adjusted stretching at room temperature again.
6. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 1 is characterized in that temperature-compensating substrate (3) at the fixing isometric fiber optic interferometric arm (2) of two points (13,14), and the gap length of two fixing points has negative temperature coefficient.
7. non-equilibrium Mach-Zehnder optical fiber interference wave division multiplexer according to claim 1, it is characterized in that thermal compensation substrate (3) is used for fixing the galianconism optical fiber in two optical fiber of not isometric fiber optic interferometric arm, the spacing distance of two fixing points has positive temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97242764 CN2322325Y (en) | 1997-11-28 | 1997-11-28 | Non-balance Mach-Zehnder optical fibre interference wave-division multiplex device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97242764 CN2322325Y (en) | 1997-11-28 | 1997-11-28 | Non-balance Mach-Zehnder optical fibre interference wave-division multiplex device |
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| CN2322325Y true CN2322325Y (en) | 1999-06-02 |
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| CN 97242764 Expired - Fee Related CN2322325Y (en) | 1997-11-28 | 1997-11-28 | Non-balance Mach-Zehnder optical fibre interference wave-division multiplex device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7773642B2 (en) | 2004-03-31 | 2010-08-10 | Nec Corporation | Tunable laser |
| CN115061241A (en) * | 2022-08-04 | 2022-09-16 | 上海羲禾科技有限公司 | Wavelength division multiplexer |
-
1997
- 1997-11-28 CN CN 97242764 patent/CN2322325Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7773642B2 (en) | 2004-03-31 | 2010-08-10 | Nec Corporation | Tunable laser |
| CN115061241A (en) * | 2022-08-04 | 2022-09-16 | 上海羲禾科技有限公司 | Wavelength division multiplexer |
| CN115061241B (en) * | 2022-08-04 | 2022-11-18 | 上海羲禾科技有限公司 | Wavelength division multiplexer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |