CN203299665U - An optical performance monitor based on temperature control optical waveguide - Google Patents
An optical performance monitor based on temperature control optical waveguide Download PDFInfo
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- CN203299665U CN203299665U CN2013203402727U CN201320340272U CN203299665U CN 203299665 U CN203299665 U CN 203299665U CN 2013203402727 U CN2013203402727 U CN 2013203402727U CN 201320340272 U CN201320340272 U CN 201320340272U CN 203299665 U CN203299665 U CN 203299665U
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Abstract
The utility model discloses an optical performance monitor based on temperature control optical waveguide. The optical performance monitor comprises a housing, a temperature control system, a fiber array, an array waveguide grating chip, an optical detector array, and a circuit board. The fiber array, the array waveguide grating chip, and the optical detector array are aligned in a coupling manner and then are fixed. The temperature control system comprises a heater and a temperature detector. The array waveguide grating chip is installed on the heater. The optical detector array, the heater, and the temperature detector are electrically connected with the circuit board. The optical performance monitor achieves channel wavelength change by temperature control, acquires spectroscopic data points by continuously scanning specific frequency, and restores a signal waveform by using a deconvolution algorithm in order to acquire accurate signal spectral lines. The product achieves a scanning width from 50GHz to 100GHz and is capable of self-calibrating the wavelength drift in the life cycle of the product. The optical performance monitor has characteristics of relatively compact structure, obviously-decreased optical loss achieved by on-chip integration, and obviously-improved reliability.
Description
Technical field
The utility model relates to optical communication field, relates in particular to a kind of optical performance monitor of controlling optical waveguide based on temperature.
Background technology
In order to improve the capacity of long-distance optical fiber communication, dense wavelength division multiplexing system has obtained greatly developing, and close wavelength-division multiplex technology is realized large capacity information transmission by as far as possible little channel spacing.In dense wavelength division multiplexing system, the temperature drift of optical source wavelength and the temperature sensitivity of dense wave division multiplexer all can cause the variation of channel center's wavelength, and and then cause the variation of the signal to noise ratio (S/N ratio) of each channel.In addition, the gain unevenness of image intensifer can cause that the power of each channel changes.Therefore, the parameters such as necessary centre wavelength to each channel in system, luminous power and signal to noise ratio (S/N ratio) are carried out Real Time Monitoring.Especially when channel separation was dwindled, the detection of the identification that the centre wavelength of monitoring and controlling channels is drifted about to spectral performance, the systemic-functions such as isolation of the system failure had even more important meaning.For example, wave length shift is easy to cause signal from a channel string to the another one channel, needs wave length shift is detected.In addition,, in order to ensure the normal operation of the image intensifer in communication system, also need the wavelength parameter Real-time Feedback in communication network element.
Optical communication system needs optical performance monitors (the Optical Performance Monitor of technical grade, OPM), and require low price, compact conformation, need to have with traditional spectroanalysis instrument identical power and wavelength accuracy, can monitor flashlight in the optical communication channel of close interval with higher wavelength resolution and larger dynamic range.
Existing optical performance monitors has multiple project organization, basically can be divided into based on the optical performance monitors of waveguide optical with based on the large class of optical performance monitors two of space optics.The former also needs other optical controller spare usually except planar optical waveguide and photo-detector.The latter's integrated level is lower, and usually needs motor element, and reliability is also lower.
The higher optical performance monitors part of precision all uses the form of Thin Film Filter or grating at present., for the Thin Film Filter structure, need mobile physical construction to be used in conjunction with, and by rotating Thin Film Filter, select the wavelength that will monitor.The shortcoming of this structure is in short wavelength's part, and because incident angle becomes large, film throws the spectral line shape variation, causes the degradation of optical performance monitors.For raster mode, need to coordinate sensor array to work together, system complex, cost is high, and to aging sensitivity and easy care not, so the commercial product device is all more expensive.
Summary of the invention
The utility model, in order to overcome above deficiency, has proposed a kind of optical power monitor of controlling optical waveguide based on temperature.
Technical matters of the present utility model is solved by following technical scheme:
a kind of optical performance monitor of controlling optical waveguide based on temperature, comprise shell, temperature control system, fiber array, array waveguide grid chip, photodetector array and circuit board, the input end of described fiber array and array waveguide grid chip is coupled and aligned rear fixing, the output terminal of described photodetector array and array waveguide grid chip is coupled and aligned rear fixing, described temperature control system comprises temperature controller and hygrosensor, described array waveguide grid chip is arranged on described temperature controller, the output electrode of described photodetector array, the electrode of temperature controller and hygrosensor are electrically connected to circuit board, described circuit board reads the temperature information of hygrosensor and the photocurrent of photodetector array, and the output temperature control signal is to temperature controller.Fig. 1 is the schematic diagram of controlling the optical performance monitor of optical waveguide based on temperature of the present utility model.
In an embodiment of the present utility model, the range of temperature that described temperature control system is controlled described array waveguide grid chip is 0.4nm/k, and wherein k is the temperature correlation coefficient of described array waveguide grid chip output wavelength.0.4nm corresponding to ITU spectrum barrier (ITU Grid) 50G channel spacing.Typically, the temperature correlation coefficient of ordinary silicon base array waveguide grid chip output wavelength is 0.011nm/ ℃, the range of temperature T of array waveguide grid chip=(0.4nm)/(0.011nm/ ℃)=36.4 ℃.
In an embodiment of the present utility model, described temperature controller is thermoelectric refrigerating unit.
In an embodiment of the present utility model, described temperature controller is resistance wire and flaky pottery.
In an embodiment of the present utility model, to fill by conduction oil between described flaky pottery and array waveguide grid chip, periphery is adhesively fixed with flexible glue.
In an embodiment of the present utility model, be adhesively fixed by glue after the input end of described fiber array and array waveguide grid chip is coupled and aligned, be adhesively fixed by glue after the output terminal of described photodetector array and array waveguide grid chip is coupled and aligned.
In an embodiment of the present utility model, described hygrosensor is thermistor.
In an embodiment of the present utility model, described hygrosensor is resistance temperature detector.
In an embodiment of the present utility model, also comprise film filter and photo-detector, a passage outside the service aisle of described film filter and photo-detector and array waveguide grid chip is coupled and aligned and fixes.Fig. 2 is the schematic diagram of the optical performance monitor based on temperature control optical waveguide of the present embodiment.
In an embodiment of the present utility model, also comprise the fixed wave length detector, a passage outside the service aisle of described fixed wave length detector and array waveguide grid chip is connected by optical fiber, described fixed wave length detector comprises GRIN Lens and photo-detector, and the end face of described GRIN Lens and photo-detector coupling is coated with light filter film.Fig. 3 is the schematic diagram of the optical performance monitor based on temperature control optical waveguide of the present embodiment.Fig. 4 is the schematic diagram of fixed wave length detector.
The utility model realizes that by the control to temperature channel wavelength changes, record spectrum by the passband in the continuous sweep particular frequency range, obtain according to this spectroscopic data point, and then adopt Deconvolution Algorithm Based on Frequency to carry out follow-up signal and process,, with the signal waveform reduction, obtain signal spectrum accurately.The utility model adopts maturation process, is particularly useful for little channel spacing, for example the scanning of 25GHz or 50GHz channel spacing.
According to the variation of 0.011nm/ ℃ of ordinary silicon based waveguides, the temperature variation of 36.4 ℃ can cause the wavelength variations of 0.4nm, and such variation range is also the channel width of 50GHz.That is to say, product can be realized the sweep length of 50GHz.For the signal transmission of ITU spectrum barrier (ITU Grid) the 50G channel spacing of a standard, the utility model can be realized the detection of the more accurate luminous power of each passage, and as shown in Figure 5, the sweep length of 50G is with whole passage spectral line.
For the signal transmission of ITU spectrum barrier (ITU Grid) the 100GHz channel spacing of a standard, the utility model can be realized the detection of each passage luminous power, and as shown in Figure 6, the sweep length of 50G will cover half of passage spectral line., as reasonably approximate, think that the passage spectral line is symmetrical, so just can obtain the spectral line shape of whole passage.Accordingly, under the help of circuit and firmware, can realize the calculating of peak value and the optical s/n ratio (OSNR) of each passage.
The utility model is based on array waveguide grating (PLC AWG) ripe, that produce in enormous quantities, and the structure relative compact, because other element on light path is integrated on can sheet, makes light loss obviously reduce., for the wave length shift that occurs in the life cycle of product, adopt stable film filter to calibrate on fixed wave length.Of the present utility model to control the optical performance monitor of optical waveguide based on temperature simple in structure, and inside do not have motor element, and the reliability of product also has clear improvement.Cost optical performance monitor has relatively in the market obtained reducing significantly.
Description of drawings
Fig. 1 is the schematic diagram of the optical performance monitor based on temperature control optical waveguide of embodiment one of the present utility model;
Fig. 2 is the schematic diagram of the optical performance monitor based on temperature control optical waveguide of embodiment two of the present utility model;
Fig. 3 is the schematic diagram of the optical performance monitor based on temperature control optical waveguide of embodiment three of the present utility model;
Fig. 4 is the schematic diagram of the fixed wave length detector of use in embodiment three of the present utility model;
Fig. 5 is 50GHz sweep length schematic diagram;
Fig. 6 is 100GHz sweep length schematic diagram.
Embodiment
Also by reference to the accompanying drawings the utility model is described in further details below by concrete embodiment.
Embodiment one:
as shown in Figure 1, a kind of optical performance monitor of controlling optical waveguide based on temperature, comprise shell, temperature control system, fiber array 103, array waveguide grid chip 101, photodetector array 102 and circuit board 105, fiber array 103 is coupled and aligned rear fixing with the input end of array waveguide grid chip 101, photodetector array 102 is coupled and aligned rear fixing with the output terminal of array waveguide grid chip 101, temperature control system comprises well heater 104 and hygrosensor 106, array waveguide grid chip 101 is arranged on well heater 104, the output electrode of photodetector array 102, the electrode of well heater 104 and hygrosensor 106 are electrically connected to circuit board 105, circuit board 105 reads the temperature information of hygrosensor 106 and the photocurrent of photodetector array 102, and the output temperature control signal is to well heater 104.
The range of temperature T of the temperature control system control array waveguide grid chip of the present embodiment=(0.4nm)/(0.011nm/ ℃)=36.4 ℃, wherein 0.011nm/ ℃ is the temperature correlation coefficient of ordinary silicon base array waveguide grid chip output wavelength.
In the present embodiment, be fixedly connected with by flexible glue between shell and temperature control system, play effect fixing and buffering.Temperature control system comprises resistance wire and flaky pottery, by resistance wire, realizes heating function, fills by conduction oil between flaky pottery and array waveguide grid chip 101, and periphery is adhesively fixed with flexible glue, and flaky pottery is realized heat sinking function.Be adhesively fixed by glue after the input end of fiber array 103 and array waveguide grid chip 101 is coupled and aligned, be adhesively fixed by glue after the output terminal of photodetector array 102 and array waveguide grid chip 101 is coupled and aligned.The hygrosensor 106 of the present embodiment is thermistor.
The course of work of the present embodiment is as follows: one group of wavelength-division multiplex signals imports into from input optical fibre, by being coupled into array waveguide grid chip 101 between input optical fibre array 103 and array waveguide grid chip 101.Array waveguide grid chip 101 is transferred to respectively different output waveguides with the signal of different wave length, then by each photo-detector that is coupled between array waveguide grid chip 101 and photodetector array 102, and then change into photocurrent, processed by the analog to digital converter on circuit board 105 (ADC) and digital signal processor (DSP).The temperature variation of 36.4 ℃ of the temperature control system control array waveguide grid chip of the present embodiment can cause the wavelength variations of 0.4nm, and such variation range is also the channel width of 50GHz.That is to say, product can be realized the sweep length of 50GHz.For the signal transmission of ITU spectrum barrier (ITU Grid) the 100GHz channel spacing of a standard, the sweep length of 50G will cover half of passage spectral line., as reasonably approximate, think that the passage spectral line is symmetrical, so just can obtain the spectral line shape of the whole passage of 100GHz spectrum barrier.
Regulate the temperature of array waveguide grid chip 101 by temperature control system, can regulate the operation wavelength of each output channel.Realize that by the control to temperature channel wavelength changes, record spectrum by the passband in the continuous sweep particular frequency range, obtain according to this spectroscopic data point, and then adopt Deconvolution Algorithm Based on Frequency to carry out follow-up signal and process,, with the signal waveform reduction, obtain signal spectrum accurately.
Embodiment two:
As shown in Figure 2, the difference of the present embodiment and embodiment one is, also comprise film filter 107 and photo-detector 108 in the present embodiment, a passage outside the service aisle of film filter 107 and photo-detector 108 and array waveguide grid chip 101 is coupled and aligned and fixes.The present embodiment is selected wavelength by film filter, and realizes the self calibration of product by a single pass photo-detector.
, for array waveguide grid chip 101, in its life cycle, have the centre wavelength drift of 20pm left and right, so can cause the hydraulic performance decline of optical performance monitor.Fig. 2 has illustrated how the utility model realizes self calibration: 102
j+1An outer passage of product work passage, its interval with 102j the same with other J passage (for example, can be 25GHz, or 50GHz, 100GHz), 107 is film filters, 108 is independent photo-detectors.
Regulate the temperature of array waveguide grid chip 101, make the peak wavelength of last passage consistent with film filter 107 operation wavelengths, namely the light intensity that receives of photo-detector 108, for maximum, is made as reference temperature with this temperature.Regularly temperature is calibrated in the product life cycle, calibration procedure is: search temperature corresponding to photo-detector 108 maximum luminous power near reference temperature, the difference of this temperature and reference temperature is deviation, this deviation is added on the working temperature of array waveguide grid chip 101, can proofreaies and correct the drift of the wavelength appearance of array waveguide grid chip 101 in life cycle.
Embodiment three:
The difference of the present embodiment and embodiment two is, the present embodiment is realized self-calibration function by fixed wave length detector 109, as shown in Figure 3.A passage outside the service aisle of fixed wave length detector 109 and array waveguide grid chip 101 is connected by optical fiber.As shown in Figure 4, fixed wave length detector 109 comprises GRIN Lens 1091, photo-detector 1092 and input optical fibre 1093, input optical fibre 1093 incoming fiber optic sleeve pipes 1094, and GRIN Lens 1091 is coated with light filter film 1095 with the end face of photo-detector 1092 couplings.
Input optical signal incides GRIN Lens 1091, be converted to directional light by GRIN Lens 1091, then incide the light filter film 1095 of GRIN Lens 1091 end face platings, only have partial fixing wavelength (as 1550nm) light signal to pass through, thereby received by photo-detector 1092, be converted into current signal and through the electrode 1096 of photo-detector 1092, export.Its self-alignment principle and process are identical with embodiment two.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. optical performance monitor of controlling optical waveguide based on temperature, it is characterized in that, comprise shell, temperature control system, fiber array, array waveguide grid chip, photodetector array and circuit board, the input end of described fiber array and array waveguide grid chip is coupled and aligned rear fixing, the output terminal of described photodetector array and array waveguide grid chip is coupled and aligned rear fixing, described temperature control system comprises temperature controller and hygrosensor, described array waveguide grid chip is arranged on described temperature controller, the output electrode of described photodetector array, the electrode of temperature controller and hygrosensor are electrically connected to circuit board, described circuit board reads the temperature information of hygrosensor and the photocurrent of photodetector array, and the output temperature control signal is to temperature controller.
2. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, it is characterized in that, the range of temperature that described temperature control system is controlled described array waveguide grid chip is 0.4nm/k, and wherein k is the temperature correlation coefficient of described array waveguide grid chip output wavelength.
3. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, is characterized in that, described temperature controller is thermoelectric refrigerating unit.
4. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, is characterized in that, described temperature controller is resistance wire and flaky pottery.
5. the optical performance monitor of controlling optical waveguide based on temperature according to claim 4, is characterized in that, fills by conduction oil between described flaky pottery and array waveguide grid chip, and periphery is adhesively fixed with flexible glue.
6. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, it is characterized in that, be adhesively fixed by glue after the input end of described fiber array and array waveguide grid chip is coupled and aligned, be adhesively fixed by glue after the output terminal of described photodetector array and array waveguide grid chip is coupled and aligned.
7. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, is characterized in that, described hygrosensor is thermistor.
8. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, is characterized in that, described hygrosensor is resistance temperature detector.
9. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, it is characterized in that, also comprise film filter and photo-detector, a passage outside the service aisle of described film filter and photo-detector and array waveguide grid chip is coupled and aligned and fixes.
10. the optical performance monitor of controlling optical waveguide based on temperature according to claim 1, it is characterized in that, also comprise the fixed wave length detector, a passage outside the service aisle of described fixed wave length detector and array waveguide grid chip is connected by optical fiber, described fixed wave length detector comprises GRIN Lens and photo-detector, and the end face of described GRIN Lens and photo-detector coupling is coated with light filter film.
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| CN2013203402727U CN203299665U (en) | 2013-06-14 | 2013-06-14 | An optical performance monitor based on temperature control optical waveguide |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238595A (en) * | 2013-06-14 | 2014-12-24 | 深圳新飞通光电子技术有限公司 | Optical performance monitor based on temperature control optical waveguide |
| CN106482864A (en) * | 2016-10-19 | 2017-03-08 | 山东省科学院激光研究所 | A kind of temperature-controlled process, device and fiber grating sensing system |
| CN107843955A (en) * | 2017-09-20 | 2018-03-27 | 博创科技股份有限公司 | A kind of hot type array waveguide grating（AWG）Module |
| US10484088B2 (en) | 2014-03-27 | 2019-11-19 | Huawei Technologies Co., Ltd. | Apparatus and method for monitoring optical performance parameter, and optical transmission system |
-
2013
- 2013-06-14 CN CN2013203402727U patent/CN203299665U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238595A (en) * | 2013-06-14 | 2014-12-24 | 深圳新飞通光电子技术有限公司 | Optical performance monitor based on temperature control optical waveguide |
| US10484088B2 (en) | 2014-03-27 | 2019-11-19 | Huawei Technologies Co., Ltd. | Apparatus and method for monitoring optical performance parameter, and optical transmission system |
| CN106482864A (en) * | 2016-10-19 | 2017-03-08 | 山东省科学院激光研究所 | A kind of temperature-controlled process, device and fiber grating sensing system |
| CN106482864B (en) * | 2016-10-19 | 2023-07-14 | 山东省科学院激光研究所 | Temperature control method and device and fiber bragg grating sensing system |
| CN107843955A (en) * | 2017-09-20 | 2018-03-27 | 博创科技股份有限公司 | A kind of hot type array waveguide grating（AWG）Module |
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Granted publication date: 20131120 |