CN101552638A - Optical channel performance monitoring module - Google Patents
Optical channel performance monitoring module Download PDFInfo
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- CN101552638A CN101552638A CNA2008100986119A CN200810098611A CN101552638A CN 101552638 A CN101552638 A CN 101552638A CN A2008100986119 A CNA2008100986119 A CN A2008100986119A CN 200810098611 A CN200810098611 A CN 200810098611A CN 101552638 A CN101552638 A CN 101552638A
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Abstract
The invention belongs to the field of optoelectronic device manufacture, in particular to an optical channel performance monitoring module (OPM) which comprises basal units such as a collimator, an electrooptical ceramic wafer, an electrooptical probe, a voltage driver, and the like. Both sides of the electrooptical ceramic wafer are respectively plated by reflecting films to form an F-P filter, and the tunability of the F-P filter is realized by changing the refractive index of electrooptical ceramic. The refractive index of the electrooptical ceramic can be changed through changing an electric field on the electrooptical ceramic so that the transmissive wavelength of the F-P filter moves to scan the wavelengths and the power of various optical channels in the whole communication bandwidth and obtain the optical signal-to-noise ratios (OSNR) of the channels by certain algorithms and treatments. Due to the adoption of the rapidly responded electrooptical ceramic, the scanning time of the OPM reaches a sub-millisecond level, the defects of the prior OPMs of diffraction type and interference type are overcome, and the invention has the advantages of high response speed and stability, small size, simple structure, no diffraction influence and no mechanical control.
Description
[technical field]
The invention belongs to optoelectronic device and make the field, relate to a kind of optical transmission system such as dense wave division multipurpose (DWDM of being used in, dense wavelength division multiplexing) optical channel performance monitoring in the system (OPM, optical performance monitoring) module.
[background technology]
In multichannel optical-fiber network, the wavelength of passage and power stability are very important.The stability of optical channel depends on the performance of optical transmitting set in the network to a great extent.Along with laser ageing and temperature change thereof, laser emitted laser wavelength and intensity all are easy to change.Because optical channel increases, and channel spacing narrows down, and wave length shift can cause crosstalking of adjacency channel, makes optical channel wave length shift and strength jitter become more obvious, this can cause transmitting error in data or bust this in the DWDM network.Thus, the safe and highly efficient operation of network just more and more needs effectively to be ensured and strengthen.Optical channel performance monitoring (OPM) module is exactly to be satisfy that these demands occur a kind of accurate, light and test module cheaply.
The OPM module can be monitored in real time to the performance of each passage in the Network Transmission signal flow.Wavelength, power and the Optical Signal To Noise Ratio that three leading indicators of its monitoring are optical channel (optical signal to noiseratio, OSNR).Existing OPM module mainly is divided into two types on principle, diffraction type OPM module and interfere type OPM module.
Based on the OPM principle of diffraction type, as shown in Figure 1, provided and utilized the OPM basic principle of transmission-type diffraction grating as diffraction element.No-movable part in the OPM module of diffraction type can be sampled simultaneously to wavelength optical signals, and its advantage is good stability, Measuring Time weak point.And shortcoming is also comparatively obvious: volume is bigger; There is diffraction effect, causes the interchannel of light signal to disturb; Be subjected to the single pixel size and the number of picture elements quantitative limitation of detector array, the collection of light signal is had certain error; High accuracy, the detector array that dynamic range is big, the rising that has brought cost.
The principle of interfere type OPM as shown in Figure 2, it mainly is made up of three parts: tunable optic filter, detector and signal processing and controller.This class OPM module advantage is that volume is little, and light path is simple, no diffraction influence; Adopt single photodetector, improved light signal collecting efficiency, reduced cost.The shortcoming of interfere type OPM is that its core devices tunable optic filter also is difficult to reach the needed bandwidth of OPM and speed and other indexs at present.Owing to adopted the serial scan mode, can not sample simultaneously to all signal components, sweep speed is slow (generally needing hundreds of ms), and the real-time monitoring of system signal is had certain difficulty.
And in the present invention,, adopted a kind of electrooptic ceramic of quick response to replace the tunable filter that has now in the interfere type OPM module based on the principle of interfere type OPM.All advantages of existing interfere type OPM module have been inherited in this invention: volume is little, and light path is simple, no diffraction influence, and cost is low.Also improve the shortcoming of interfere type OPM module simultaneously, had the advantage of diffraction type OPM module concurrently.At first, the OPM module of this invention can reach inferior ms magnitude sweep time, far above existing interfere type OPM module, can compare even be better than a lot of diffraction type OPM modules with diffraction type OPM module.Secondly, this invention replaces machinery control with electric control on type of drive, avoided mechanical control to have instable defective, and by can be easy to realize hi-Fix to voltage control, strengthened reliability.
[summary of the invention]
The objective of the invention is to: the optical channel performance monitoring module scheme that has proposed a kind of electrooptic ceramic based on quick response, this optical channel performance monitoring module has overcome the shortcoming of existing diffraction type and interfere type OPM, the advantage fast with response speed, that stability is high, little, simple in structure, the no diffraction of volume influences, do not have machinery control, reliability is high.
The technical solution adopted in the present invention is:
A kind of optical channel performance monitoring module is disposed with elementary cell along monitoring input signal light path direction: collimater, tunable F-P filter, photodetector, and tunable F-P filter is connected with voltage driver.
Described tunable F-P filter can be made of a kind of electrooptic ceramic sheet of quick response, and, constitute the F-P filter at this electrooptic ceramic sheet two sides plating reflectance coating, outside reflectance coating, also be coated with transparent conducting film electrode, the conducting film electrode is connected with voltage driver, applies electric field for this electrooptic ceramic sheet by voltage driver.
Described tunable F-P filter thickness is suitable, guarantees that this F-P filter has only a transmission peaks in whole communication bandwidth.By changing the electric field strength of described electrooptic ceramic sheet, can change its refractive index, the transmission peaks of described F-P filter is moved, realize the tunable of described F-P filter.
Described electrooptic ceramic sheet has high electro-optic response speed, can be at the light signal in very short time (inferior ms magnitude) the whole communication bandwidth of interscan.
Described electrooptic ceramic sheet has very high electro-optic coefficient, and the transmission peaks of this F-P filter moves in this communication bandwidth a week only needs very little voltage variety.
Described tunable F-P filter also can be made of material other variable refractive index or thickness, that can respond fast.
Described tunable F-P filter tuner mode is not limited only to electric light, also comprises modes such as magneto-optic, hot light.
Described F-P filter back can increase the substrate of a printing opacity, to reduce the difficulty of processing of electrooptic ceramic sheet, strengthens the F-P stability of filter.
Advantage of the present invention: because electro optic effect, the refractive index of electrooptic ceramic changes with the electric field that applies on it, has promptly changed free spectral range (FSR) width of F-P filter, makes the transmission peaks of F-P filter move, and realizes tunable.Can change its refractive index by the electric field that changes on this electrooptic ceramic, the transmission peaks of F-P filter is moved.Suitably select the thickness and the reflectivity of F-P filter, make that to have only a transmission peaks and its bandwidth in whole communication bandwidth enough narrow, just can the light signal of each passage in the whole communication bandwidth be scanned, draw wavelength, the power of different optical channels, and draw the Optical Signal To Noise Ratio (OSNR) of each passage through certain algorithm and processing.
This electrooptic ceramic has high electro-optic response speed (reaching inferior us magnitude), to the scanning of light signal in the whole communication bandwidth only require a very short time (inferior ms magnitude).This makes the sweep speed of this optical channel performance monitoring module be far superior to existing interfere type OPM, even is better than diffraction type OPM.
Because this electrooptic ceramic electro-optic coefficient is very big, therefore the voltage variety of very little (tens V) just can guarantee transmission peaks mobile week in whole communication bandwidth, and the light signal composition of different wave length/frequency is extracted.
Because electrooptic ceramic of the present invention is directly to use electric control, voltage driver is simple in structure, and tuned speed is very fast, has avoided mechanical control to have instable defective.And, strengthened reliability by can be easy to realize hi-Fix to voltage control.
In sum, adopt the optical channel monitoring module of quick response electrooptic ceramic, overcome the shortcoming of existing diffraction type and interfere type OPM, the advantage fast with response speed, that stability is high, little, simple in structure, the no diffraction of volume influences, do not have machinery control.
[description of drawings]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 diffraction type OPM module principle figure.
Fig. 2 interfere type OPM module principle figure.
Fig. 3 OPM module base unit of the present invention structural representation.
Fig. 4 the present invention is tunable F-P filter construction schematic diagram.
Fig. 5 the present invention is tunable F-P filter transmission peak is with the Changing Pattern of voltage.
The sweep waveform schematic diagram of Fig. 6 OPM module of the present invention.
F-P filter schematic at the bottom of Fig. 7 belt material of the present invention.
[embodiment]
Below by embodiment the present invention is further described:
With reference to Fig. 3, elementary cell of the present invention as shown in Figure 3.Elementary cell of the present invention comprises collimater (1), tunable F-P filter (2), photodetector (3), voltage driver (4).Be disposed with collimater (1), tunable F-P filter (2), photodetector (3) along monitoring input signal light path direction, and tunable F-P filter (2) is connected with voltage driver (4).With reference to Fig. 4, wherein, tunable F-P filter (2) is made of electrooptic ceramic sheet (21) and reflective coating (22), (23).
Input signal light A to be monitored is output as A1 from collimater (1), A1 incides electrooptic ceramic sheet (21), plate reflectance coating (22), (23) respectively on the forward and backward surface of electrooptic ceramic sheet (21), reflectance coating (22), (23) and electrooptic ceramic sheet (21) constitute F-P filter (2).In order to give electrooptic ceramic sheet (21) making alive, plating conducting film electrode (24), (25) outside reflectance coating (22), (23).Electrode generally adopts ITO plated film mode, applies electric field for this electrooptic ceramic sheet (21) by voltage driver (4), and incident light A1 takes place repeatedly to interfere the back to be penetrated in F-P filter (2), and emergent light is A2.
Can produce electro optic effect when on electrooptic ceramic sheet (21), applying electric field, the refractive index of electrooptic ceramic sheet (21) is changed.By changing the electric field on voltage and then the change electrooptic ceramic sheet (21), can change the refractive index of electrooptic ceramic sheet (21), promptly changed the FSR of F-P filter (2), the transmission peaks of F-P filter (2) is moved.Change voltage by certain change interval, can realize input light is scanned, obtain optical wavelength, the power of different channels, and obtain the OSNR value of each channel by certain algorithm computation.
Suitably select the thickness of electrooptic ceramic sheet (21), can guarantee that only there is a transmission peaks in (choosing communication herein is example with wave band 1520nm～1570nm) in whole communication bandwidth.Shown in three transmission curves in Fig. 5 length scanning principle schematic, wherein, three transmission curves are represented the transmissison characteristic of F-P filter (2) under the different driving voltage respectively.Transverse axis is represented wavelength, and the longitudinal axis is represented transmissivity with loss (dB).Along with voltage increases, changes to U3 from U1, the transmission peaks of F-P filter (2) moves on to 1520nm from the 1570nm order.Because electrooptic ceramic has high electro-optic response speed, therefore can be at the light signal of very short time (inferior ms magnitude) the whole wave band of interscan.
Be illustrated in figure 6 as the sweep waveform schematic diagram of OPM.Wherein the true form of scanning impulse (31) is the transmission waveform of F-P filter (2), and expression scans the signal spectra shape that obtains as dotted line (32).The transmitted wave shape is just in order to illustrate among Fig. 6, and is subjected to the influence of F-P filter (2) bandwidth in the reality, may have the overlay region between the adjacent scanning impulse, and this can handle and revise by algorithm.
As shown in Figure 7, in order to reduce the difficulty of processing of electrooptic ceramic sheet (21), strengthen the F-P stability of filter, can increase the substrate of a printing opacity in F-P filter (2) back, wherein, substrate (5) is a light transmissive material.Substrate (5) can play fixation to F-P filter (2) on the one hand; On the other hand, also can support electrooptic ceramic sheet (21), the thickness that makes polishing add electrooptic ceramic sheet in man-hour (21) can be ground to very thin (tens um).
The optical channel performance monitoring module that the present invention proposes, tunable F-P filter (2) wherein is except the electrooptic ceramic that can adopt quick response, also can constitute by material other variable refractive index or thickness, that can respond fast, and tuning manner is not limited only to electric light, also comprises modes such as magneto-optic, hot light.
Although specifically show and introduced the present invention in conjunction with preferred embodiment, but the those skilled in the art should be understood that, in the spirit and scope of the present invention that do not break away from appended claims and limited, can make various variations to the present invention in the form and details.
Claims (7)
1, a kind of optical channel performance monitoring module is characterized in that: be disposed with elementary cell along monitoring input signal light path direction: collimater, tunable F-P filter, photodetector and tunable F-P filter are connected with voltage driver.
2, a kind of optical channel performance monitoring module as claimed in claim 1, it is characterized in that: described tunable F-P filter can be made of a kind of electrooptic ceramic sheet of quick response, and, constitute the F-P filter at this electrooptic ceramic sheet two sides plating reflectance coating, outside reflectance coating, also be coated with transparent conducting film electrode, the conducting film electrode is connected with voltage driver, applies electric field for this electrooptic ceramic sheet by voltage driver.
3, a kind of optical channel performance monitoring module as claimed in claim 1 is characterized in that: described tunable F-P filter thickness is suitable, guarantees that this F-P filter has only a transmission peaks in whole communication bandwidth.
4, a kind of optical channel performance monitoring module as claimed in claim 2 is characterized in that: described electrooptic ceramic sheet has very high electro-optic coefficient, and the transmission peaks of this F-P filter moves in this communication bandwidth a week only needs very little voltage variety.
5, as claim 1,2 described a kind of optical channel performance monitoring modules, it is characterized in that: described tunable F-P filter also can be made of material other variable refractive index or thickness, that can respond fast.
6, as claim 1,2 described a kind of optical channel performance monitoring modules, it is characterized in that: described tunable F-P filter tuner mode is not limited only to electric light, also comprises modes such as magneto-optic, hot light.
7, as claim 1,2 described a kind of optical channel performance monitoring modules, it is characterized in that: described F-P filter back can increase the substrate of a printing opacity.
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| CNA2008100986119A CN101552638A (en) | 2008-05-30 | 2008-05-30 | Optical channel performance monitoring module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398799A (en) * | 2013-07-08 | 2013-11-20 | 华中科技大学 | Fabry-Perot interference ring image processing method |
| US9014556B2 (en) | 2011-04-12 | 2015-04-21 | Huawei Technologies Co., Ltd. | Optical power monitoring method and apparatus |
| CN109698719A (en) * | 2019-02-24 | 2019-04-30 | 苏州工业园区新国大研究院 | A kind of optical signal to noise ratio detection method based on multimode fibre interferometer |
| CN112867962A (en) * | 2018-09-11 | 2021-05-28 | 恩耐公司 | Electro-optic modulator and method of use and manufacture thereof for three-dimensional imaging |
-
2008
- 2008-05-30 CN CNA2008100986119A patent/CN101552638A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9014556B2 (en) | 2011-04-12 | 2015-04-21 | Huawei Technologies Co., Ltd. | Optical power monitoring method and apparatus |
| CN103398799A (en) * | 2013-07-08 | 2013-11-20 | 华中科技大学 | Fabry-Perot interference ring image processing method |
| CN103398799B (en) * | 2013-07-08 | 2016-01-20 | 华中科技大学 | Fabry Perot interference circle image processing method |
| CN112867962A (en) * | 2018-09-11 | 2021-05-28 | 恩耐公司 | Electro-optic modulator and method of use and manufacture thereof for three-dimensional imaging |
| CN109698719A (en) * | 2019-02-24 | 2019-04-30 | 苏州工业园区新国大研究院 | A kind of optical signal to noise ratio detection method based on multimode fibre interferometer |
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Open date: 20091007 |