CN100435497C - Device for monitoring optical signal in optical transmission system - Google Patents
Device for monitoring optical signal in optical transmission system Download PDFInfo
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- CN100435497C CN100435497C CNB2005100284343A CN200510028434A CN100435497C CN 100435497 C CN100435497 C CN 100435497C CN B2005100284343 A CNB2005100284343 A CN B2005100284343A CN 200510028434 A CN200510028434 A CN 200510028434A CN 100435497 C CN100435497 C CN 100435497C
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Abstract
The present invention relates to a device for monitoring optical signals in optical transmission systems, and belongs to the technical field of optical fiber communication. The present invention comprises a local laser, a first polarization control unit, a second polarization control unit, a coupler, an optical detection unit, a radio frequency (RF) power detection unit and a main control unit. The output terminal of the local laser is optically connected with the coupler through the second polarization control unit. The first polarization control unit is arranged on a detected signal optical path. The output terminal of the first polarization control unit is optically connected with one input terminal of the coupler. The second polarization control unit is arranged on a local oscillation optical path. The output terminal of the second polarization control unit is optically connected with the other input terminal of the coupler. The coupler is an element with four terminals. The electric output terminal of the optical detection unit is connected with the radio frequency power detection unit. The present invention can simultaneously monitor signals, central wavelength with inner noise, deduced optical filter accumulation shape, and frequency drift between central signal wavelength and central filter wavelength.
Description
Technical field
What the present invention relates to is a kind of device of technical field of optical fiber communication, specifically, is the device of optical monitoring signal in a kind of optical transmission system.
Background technology
In the reconfigurable optical network, each channel all will be through multiplexing, demultiplexing and route before being received, and signal is every through primary multiplexer/demodulation multiplexer, all will stand certain filter effect.In this course, spontaneous radiation (ASE) noise in the channel passband constantly accumulates, and the outer filtered device of ASE noise of channel has been restricted to lower level, therefore band power level interior and the outer ASE noise of band is different, obviously the power level of ASE noise has determined final Optical Signal To Noise Ratio (OSNR) in the band, also is signal quality.And traditional spectroanalysis instrument (OSA) based on the rotation diffraction grating structure can't be told in-band noise by right area.But people more wish to obtain more the information about signal, as signal center's wavelength, accumulation filter shape etc., by filter shape can monitor signal centre wavelength frequency drift, and these can obtain by ASE spectrum in being with.Yet traditional OSA is because the restriction of resolution (representative value 0.1nm), is difficult to detect the fine structure of 10Gb/s and following data rate signal.Owing to be subjected to realizing the restriction on the principle, can not from light signal, tell noise by right area, therefore can not monitor ASE spectrum in the band.
Find by prior art documents, in open source literature, still there be not the solution of discovery to this problem, in the technology of existing measurement OSNR, the U.S. Patent number of people such as Y.C.Chung application is 6433864, disclosed technology in " Apparatus for Monitoring Optical Signal-to-noise Ratioof Optical Signals in WDM Optical Transmission System (being used for monitoring the device of WDM optical transmission system Optical Signal To Noise Ratio) " by name, this technology is utilized the detected beat noise power of electrical filter and the optical signal power that measures behind demultiplexing calculates OSNR, this method can be measured OSNR in the band, but may cause error because of the influence of undesirable other noise signal, the influence of polarization mode dispersion in addition, (PMD) also may cause error.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the device of optical monitoring signal in a kind of optical transmission system is provided.Make its can be used in dynamic reconfigurable wavelength division multiplexing (WDM) optical transmission system signal spectrum and the band in (In-band) ASE spectrum, and the monitoring of the interior OSNR of band, the various defectives that prior art exists have been solved, can also carry out the monitoring of the centre wavelength of signal and in-band noise simultaneously, and the frequency drift of the accumulation optical filter shape that can derive thus and signal center's wavelength and filter center wavelength.
The present invention is achieved by the following technical solutions, the present invention includes: local laser, the first Polarization Control unit, the second Polarization Control unit, coupler, optical detecting unit, radio frequency (RF) power detecting unit, main control unit, local laser output mouth links to each other with coupler optics by the second Polarization Control unit, the first Polarization Control unit is located on the measured signal light path, the first Polarization Control unit output links to each other with one of them input port optics of coupler, the second Polarization Control unit is located on the local oscillator light path, the second Polarization Control unit output links to each other with another input port optics of coupler, coupler is four port devices, two input port respectively with the first Polarization Control unit, the output of the second Polarization Control unit links to each other, two output ports link to each other with the input port optics of optical detecting unit, the electric output of optical detecting unit links to each other with the radio-frequency power detecting unit, the radio-frequency power detecting unit is located at after the optical detecting unit, and the measurement result of radio-frequency power detecting unit is transferred to the main control unit record by gpib interface.
Described local laser, its wavelength is adjustable continuously, produces local oscillator light.
Described local laser is a narrow linewidth laser, and its parameter area is 300kHZ-20MHz.
FEEDBACK CONTROL is supported in described Polarization Control unit, is used to adjust the polarization state of light signal to be measured and local oscillations laser.
Described coupler is used for the mixing of measured signal light and local oscillator light.
Described coupler, it is along separate routes than being 50: 50.
Described optical detecting unit is the balance photoelectric detector, comprises the PIN pipe of two symmetries.
Described optical detecting unit is the low bandwidth balanced detector, and luminous power is converted to electrical power.
Described low bandwidth balanced detector, bandwidth are DC-155MHz.
Described radio-frequency power detecting unit is a narrowband device, is used to detect the power of the beat signal of telecommunication.
Described narrowband device, bandwidth are DC-155MHz.
Described main control unit, polarization state according to two Polarization Control unit of the electromotive power output of radio-frequency power detecting unit size FEEDBACK CONTROL, write down the power output of radio-frequency power detecting unit simultaneously, and drive local laser its output wavelength is changed continuously.
The course of work of the present invention is as follows: regulate two Polarization Control unit by main control unit, to adjust light signal to be measured and local oscillations polarization state of light, make it vertical or identical.When both polarization state was mutually vertical, main control unit was regulated the local oscillations light wavelength continuously, is recorded the power output at different wave length place by the radio-frequency power detecting unit; Record ASE spectrum in the band thus.When both polarization state was identical, main control unit was recorded the power output at different wave length place by regulating the local oscillations light wavelength continuously by the radio-frequency power detecting unit; Record signal spectrum thus.By ASE spectrum in integrated signal spectrum and the band, obtain signal power and noise power, obtain being with interior OSNR thus, this process is finished by main control unit.
Because the present invention has used first, second two Polarization Control unit to control measured signal light and local polarized state of light respectively, and used wavelength-tunable local oscillations laser, therefore except accurately measuring the OSNR, can also accurately measure ASE spectrum in the band, the centre wavelength of signal and in-band noise, and the frequency drift of the accumulation optical filter shape that can derive thus and signal center's wavelength and filter center wavelength.
Description of drawings
Fig. 1 is a structured flowchart of the present invention
Embodiment
As shown in Figure 1, the present invention includes: local laser, the first Polarization Control unit, the second Polarization Control unit, coupler, optical detecting unit, radio frequency (RF) power detecting unit, main control unit, local laser output mouth links to each other with coupler optics by the second Polarization Control unit, the first Polarization Control unit is located on the measured signal light path, the first Polarization Control unit output links to each other with one of them input port optics of coupler, the second Polarization Control unit is located on the local oscillator light path, the second Polarization Control unit output links to each other with another input port optics of coupler, coupler is four port devices, two input port respectively with the first Polarization Control unit, the output of the second Polarization Control unit links to each other, two output ports link to each other with the input port optics of optical detecting unit, the electric output of optical detecting unit links to each other with the radio-frequency power detecting unit, the radio-frequency power detecting unit is located at after the optical detecting unit, and the measurement result of radio-frequency power detecting unit is transferred to the main control unit record by gpib interface.
Described local laser, its wavelength is adjustable continuously, produces local oscillator light.
FEEDBACK CONTROL is supported in described Polarization Control unit, is used to adjust the polarization state of light signal to be measured and local oscillations laser.
Described coupler is used for the mixing of measured signal light and local oscillator light.
Described optical detecting unit is converted to electrical power with luminous power.
Described radio-frequency power detecting unit is used to detect the power of the beat signal of telecommunication.
Described main control unit, polarization state according to two Polarization Control unit of the electromotive power output of radio-frequency power detecting unit size FEEDBACK CONTROL, write down the power output of radio-frequency power detecting unit simultaneously, and drive local laser its output wavelength is changed continuously.
In above-mentioned monitoring device, local laser is narrow linewidth laser (representative value 300kHZ-20MHz), can adopt Anritsu MG9638A.First, second Polarization Control unit and support FEEDBACK CONTROL can adopt GP MPC-4X.Coupler is four port devices, along separate routes than being 50: 50.Optical detecting unit is the low bandwidth balanced detector, comprises the PIN pipe of two symmetries, and the bandwidth representative value is DC-155MHz.Electric amplifier is the low noise narrow-band amplifier, can adopt NF SA-230F5.The radio-frequency power detecting unit is narrowband device (representative value DC-155MHz), needs to support measurement programming, can adopt HP 8594E.
Claims (9)
1. the device of optical monitoring signal in the optical transmission system, comprise: coupler, optical detecting unit, the radio-frequency power detecting unit, main control unit, it is characterized in that, also comprise: local laser, the first Polarization Control unit, the second Polarization Control unit, local laser output mouth links to each other with coupler optics by the second Polarization Control unit, the first Polarization Control unit is located on the measured signal light path, the first Polarization Control unit output links to each other with one of them input port optics of coupler, the second Polarization Control unit is located on the local oscillator light path, the second Polarization Control unit output links to each other with another input port optics of coupler, coupler is four port devices, two input port respectively with the first Polarization Control unit, the output of the second Polarization Control unit links to each other, two output ports link to each other with the input port optics of optical detecting unit, the electric output of optical detecting unit links to each other with the radio-frequency power detecting unit, the radio-frequency power detecting unit is located at after the optical detecting unit, and the measurement result of radio-frequency power detecting unit is transferred to the main control unit record by gpib interface;
Described main control unit, polarization state according to two Polarization Control unit of the electromotive power output of radio-frequency power detecting unit size FEEDBACK CONTROL, write down the power output of radio-frequency power detecting unit simultaneously, and drive local laser its output wavelength is changed continuously; Regulate two Polarization Control unit by main control unit, to adjust light signal to be measured and local oscillations polarization state of light, make it vertical or identical, when both polarization state is mutually vertical, main control unit is regulated the local oscillations light wavelength continuously, is recorded the power output at different wave length place by the radio-frequency power detecting unit; Record ASE spectrum in the band thus, when both polarization state was identical, main control unit was recorded the power output at different wave length place by regulating the local oscillations light wavelength continuously by the radio-frequency power detecting unit; Record signal spectrum thus, by ASE spectrum in integrated signal spectrum and the band, obtain signal power and noise power, obtain being with interior OSNR thus, this process is finished by main control unit.
2. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 1, described local laser, and its wavelength is adjustable continuously, produces local oscillator light.
3. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 2, and described local laser is a narrow linewidth laser, and its parameter area is 300kHZ-20MHz.
4. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 1, described coupler, and it is along separate routes than being 50: 50.
5. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 1, and described optical detecting unit is the balance photoelectric detector, comprises the PIN pipe of two symmetries.
6. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 1, and described optical detecting unit is the low bandwidth balanced detector, and luminous power is converted to electrical power.
7. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 6, described low bandwidth balanced detector, and bandwidth is DC-155MHz.
8. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 1, and described radio-frequency power detecting unit is a narrowband device, is used to detect the power of the beat signal of telecommunication.
9. the device of optical monitoring signal is characterized in that in the optical transmission system according to claim 8, described narrowband device, and bandwidth is DC-155MHz.
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| CNB2005100284343A CN100435497C (en) | 2005-08-04 | 2005-08-04 | Device for monitoring optical signal in optical transmission system |
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| CNB2005100284343A CN100435497C (en) | 2005-08-04 | 2005-08-04 | Device for monitoring optical signal in optical transmission system |
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| CN100435497C true CN100435497C (en) | 2008-11-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101409589B (en) * | 2007-10-08 | 2011-04-20 | 深圳新飞通光电子技术有限公司 | Drive circuit for laser |
| CN101997611B (en) * | 2009-08-20 | 2014-02-26 | 华为技术有限公司 | Frequency tracking method, device and coherent detection receiving device |
| WO2016023196A1 (en) * | 2014-08-13 | 2016-02-18 | 华为技术有限公司 | Method and apparatus for determining optical signal-to-noise ratio |
| CN104363048B (en) * | 2014-10-24 | 2017-04-12 | 华中科技大学 | Coherent mixing based in-band optical signal to noise ratio monitoring method and calculation system |
| CN105763253A (en) * | 2015-12-24 | 2016-07-13 | 暨南大学 | Optical power monitoring method based on sweep frequency of coherent receiver |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004056018A1 (en) * | 2002-12-16 | 2004-07-01 | Teralink Communications, Inc. | Osnr monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
| US6813021B2 (en) * | 2000-06-05 | 2004-11-02 | Teralink Communications, Inc. | Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method |
| CN1612505A (en) * | 2003-10-29 | 2005-05-04 | 韩国电子通信研究院 | Apparatus and method for monitoring optical signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6813021B2 (en) * | 2000-06-05 | 2004-11-02 | Teralink Communications, Inc. | Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method |
| WO2004056018A1 (en) * | 2002-12-16 | 2004-07-01 | Teralink Communications, Inc. | Osnr monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
| CN1612505A (en) * | 2003-10-29 | 2005-05-04 | 韩国电子通信研究院 | Apparatus and method for monitoring optical signal |
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