CN102437877A - Free-space optical (FSO) signal receiving device - Google Patents

Free-space optical (FSO) signal receiving device Download PDF

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Publication number
CN102437877A
CN102437877A CN201110420287XA CN201110420287A CN102437877A CN 102437877 A CN102437877 A CN 102437877A CN 201110420287X A CN201110420287X A CN 201110420287XA CN 201110420287 A CN201110420287 A CN 201110420287A CN 102437877 A CN102437877 A CN 102437877A
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China
Prior art keywords
fso
signal
fso signal
receiving device
variable optical
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CN201110420287XA
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Chinese (zh)
Inventor
杜必钦
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SHENZHEN SIAN COMMUNICATIONS TECHNOLOGY Co Ltd
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SHENZHEN SIAN COMMUNICATIONS TECHNOLOGY Co Ltd
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Priority to CN201110420287XA priority Critical patent/CN102437877A/en
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Abstract

The embodiment of the invention discloses a free-space optical (FSO) signal receiving device, which comprises a dimmable attenuating sheet, an FSO signal detector, a motor and a processor, wherein the FSO signal detector and the motor are both connected with the processor; the dimmable attenuating sheet comprises a plurality of attenuation areas; different attenuation areas have different attenuation degrees for the FSO signal; the dimmable attenuating sheet is connected with the motor; the FSO signal detector is used for receiving a first FSO signal which is emitted by an FSO signal emitting device and is attenuated by the dimmable attenuating sheet; the processor is used for controlling the motor to drive the dimmable attenuating sheet to rotate to the attenuation area with a smaller attenuation degree for the FSO signal when the intensity of the first FSO signal is smaller than a first light intensity; and the processor is used for controlling the motor to drive the dimmable attenuating sheet to rotate to the attenuation area with a bigger attenuation degree for the FSO signal when the intensity of the first FSO signal is bigger than a second light intensity, wherein the second light intensity is more than the first light intensity. After the free-space optical (FSO) signal receiving device is adopted, influence of the phenomenon of light reflection or overload on the FSO quality can be lowered.

Description

FSO FSO signal receiving device
Technical field
The present invention relates to optical communication technique, relate in particular to a kind of FSO (free space optics, FSO) signal receiving device.
Background technology
FSO adopts infrared laser to carry the Radio Transmission Technology of high speed signal in optical communication; It is applied in some and is not suitable for laying in the scene of optical fiber; For example: in scenes such as historical natural science pipe; Can adopt the FSO technology to realize the wireless connections of OLT (Optical Line Terminal, optical line terminal) and POS (Passive Optical Splitter, passive optical splitters).Realize that the FSO technology need comprise usually: FSO sender unit and FSO signal receiving device; The FSO sender unit converts the uplink optical signal of the downlink optical signal of OLT or POS into FSO signal (infrared laser signal a kind of) and is transmitted to the FSO signal receiving device, realizes the wireless transmission of downlink optical signal or uplink optical signal; The mounting distance of FSO sender unit and FSO signal receiving device changes between several kms at tens meters along with the different of application scenarios at present; If during the mounting distance nearer (for example: in hundred meters) of FSO sender unit and FSO signal receiving device; Overload or reflective phenomenon possibly appear at FSO signal receiving device end; Wherein overload is meant when the intensity of the FSO signal that arrives the FSO signal receiving device surpasses the allowed maximum FSO signal strength signal intensity of FSO signal receiving device; The error rate of the FSO signal that the FSO signal receiving device receives will significantly increase, and influence normal communication quality or cause normal service disconnection; Reflective being meant when the mounting distance of FSO signal receiving device and FSO sender unit is nearer; The FSO signal receiving device is when receiving the FSO signal; Can reflect the FSO signal in large quantities and return the FSO sender unit; After the intensity of FSO signal of reflection acquires a certain degree, the error rate of the FSO signal that the FSO sender unit is launched is significantly increased, influence normal communication quality or cause normal service disconnection.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of FSO signal receiving device is provided, can be when FSO sender unit and FSO signal receiving device be closely installed, reduce the influence of reflective or overload phenomenon to the FSO quality.
In order to solve the problems of the technologies described above; The embodiment of the invention provides a kind of FSO FSO signal receiving device; Comprise: variable optical attenuation sheet, FSO signal sensor, motor and processor, said FSO signal sensor all is connected with said processor with said motor, and said variable optical attenuation sheet comprises a plurality of attenuation region; And each attenuation region is different to the degree of decay of FSO signal, and said variable optical attenuation sheet is connected with said motor;
Said FSO signal sensor, be used to receive by the emission of FSO sender unit and by the FSO signal after the said variable optical attenuation sheet decay;
Said processor when being used for intensity when a said FSO signal less than first luminous intensity, is controlled the said variable optical attenuation sheet of said driven by motor to the attenuation region rotation littler to the degree of decay of FSO signal;
Said processor; When also being used for intensity when a said FSO signal greater than second luminous intensity; Control the said variable optical attenuation sheet of said driven by motor to the attenuation region rotation bigger to the degree of decay of FSO signal, said second luminous intensity is greater than said first luminous intensity.
Wherein, said FSO signal sensor comprises: avalanche diode APD detector.
Wherein, a said FSO signal comprises: the communicate optical signal of 850nm or the communicate optical signal of 1550nm.
Wherein, also comprise: narrow band pass filter;
Said narrow band pass filter is positioned on the light transmission path of said variable optical attenuation sheet and said FSO signal sensor.
Wherein, the shape of said variable optical attenuation sheet comprises: circle, annular, ellipse or oval ring; Said a plurality of attenuation region is arranged on said variable optical attenuation sheet according to the magnitude relationship to FSO signal attenuation degree in the direction of the clock or by counter clockwise direction successively.
Wherein, comprise first attenuation region in said a plurality of attenuation region; Said FSO signal receiving device also comprises: position detector;
Said position detector is connected with said processor, is used to detect the position of said first attenuation region;
Said processor is used for when the rotation of the said variable optical attenuation sheet of the said driven by motor of control, with the position of said first attenuation region as a reference, confirms the direction of the said variable optical attenuation sheet rotation of said driven by motor.
Wherein, said position detector comprises: infrared-emitting diode and infrared phototriode; Said FSO signal receiving device also comprises: reflecting piece; Said reflecting piece is arranged on said first attenuation region; And when said reflecting piece and said position detector over against the time, the distance of said reflecting piece and said position detector is in the reflective distance of infrared signal;
Said infrared-emitting diode is used to launch infrared signal;
Said infrared phototriode is used to receive the infrared signal of said reflecting piece reflected back;
Said processor also is used for when said infrared phototriode receives said infrared signal, judge current and said position detector over against the zone be said first attenuation region.
Embodiment of the present invention embodiment has following beneficial effect:
The FSO signal receiving device of the embodiment of the invention; The FSO signal that its FSO signal sensor receives is through the FSO signal after the decay of variable optical attenuation sheet; Thereby can, FSO signal receiving device and FSO sender unit reduce the influence of overload or reflective phenomenon when closely installing to the FSO quality; In the variable optical attenuation sheet a plurality of decay areas are arranged in addition, processor is according to the intensity of a FSO signal, and the degree of decay to the FSO signal is adjusted in the rotation of control driven by motor variable optical attenuation sheet in real time, adapts to the decay requirement of varying environment condition to the FSO signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of first embodiment of FSO signal receiving device of the present invention;
Fig. 2 is the structural representation of second embodiment of FSO signal receiving device of the present invention;
Fig. 3 is the structural representation of the 3rd embodiment of FSO signal receiving device of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Please refer to Fig. 1, is the structural representation of first embodiment of FSO signal receiving device of the present invention, and said FSO signal receiving device comprises: variable optical attenuation sheet 11, FSO signal sensor 12, processor 13 and motor 14;
Wherein, the shape of variable optical attenuation sheet 11 can be circle, annular, ellipse or oval ring.Include a plurality of attenuation region in the variable optical attenuation sheet 11, and each attenuation region is different to the degree of decay of FSO signal.In one embodiment; Said a plurality of attenuation region basis is to the magnitude relationship of the degree of decay of FSO signal; According to clockwise direction or according to counterclockwise branch to being arranged in successively on the variable optical attenuation sheet 11, for example a plurality of attenuation region are according to the ascending relation of the pad value of FSO signal, according to direction widdershins; Be arranged in successively on the variable optical attenuation sheet 11, realize of the asymptotic expression decay of FSO signal from 0dB～40dB.It is understandable that variable optical attenuation sheet 11 can form by electroplating the film manufacturing with different transmitances in the zones of different of sheet glass, is perhaps formed by the single attenuator composite construction with different transmitances.
FSO signal sensor 12 for example can be APD (Avalanche Photo Diode, an avalanche photodide) detector.Particularly, FSO signal sensor 12 is positioned on the same light transmission path with variable optical attenuation sheet 11, be used to receive the emission of FSO sender unit and by the FSO signal after 11 decay of variable optical attenuation sheet; Because the FSO signal that FSO signal sensor 12 receives is by 11 decay of variable optical attenuation sheet; Therefore when FSO sender unit and FSO signal receiving device are closely installed; Overload or reflective phenomenon that the FSO signal that can avoid receiving causes too by force, thus the FSO quality guaranteed.
Processor 13; Be connected with motor 14 with FSO signal sensor 12 respectively; The intensity of a FSO signal that is used for receiving according to FSO signal sensor 12; Send the corresponding driving signal to motor 14, control motor 14 drives the coupled variable optical attenuation sheet that connects 11 rotations, the degree of decay of regulating 11 pairs of FSO signals of variable optical attenuation sheet.Particularly, the intensity that detects a FSO signal when processor 13 is during less than first luminous intensity, and control motor 14 drives variable optical attenuation sheets 11 to the attenuation region rotation that the FSO signal is had the littler degree of decay; The intensity that detects a FSO signal when processor 13 is during greater than second luminous intensity, and control motor 14 drives variable optical attenuation sheets 11 to the FSO signal being had the more attenuation region rotation of high attenuation degree, and wherein second luminous intensity is greater than first luminous intensity; Need to prove; When the intensity of a FSO signal is between first luminous intensity and second luminous intensity; Its error code degree is lower; The FSO quality is better, and first luminous intensity can be thought the luminous intensity lower limit of FSO signal sensor 12 for guaranteeing that the FSO quality is allowed, second luminous intensity can be thought the luminous intensity higher limit of FSO signal sensor 12 for guaranteeing that the FSO quality is allowed.Need to prove; After motor 14 drives 11 rotations of variable optical attenuation sheet; Processor 13 can confirm whether the variable optical attenuation sheet 11 current attenuation region that rotate to are suitable, if suitable according to the Strength Changes situation of a FSO signal; Then control motor 14 and quit work, make variable optical attenuation sheet 11 be fixed on current location.Because processor 13 is according to the intensity of a FSO signal; Adjust the degree of decay of 11 pairs of FSO signals of variable optical attenuation sheet in real time; Make the intensity of a FSO signal be unlikely too strong, and cause overload or reflective phenomenon, also make the intensity of a FSO signal be unlikely too a little less than; And can not guarantee communication quality, reach of the decay requirement of adaptation varying environment condition with this to the FSO signal; For example: when weather is better; Can adjust the variable optical attenuation sheet, thereby use the attenuation region big, when bad weather such as experiencing a thick fog the degree of decay of FSO signal; Can adjust the variable optical attenuation sheet, thereby use the attenuation region little the degree of decay of FSO signal.
Please refer to Fig. 2; It is the structural representation of second embodiment of FSO signal receiving device of the present invention; The difference of Fig. 2 and Fig. 1 is, is positioned on the light transmission path of 12 of variable optical attenuation sheet 11 and FSO signal sensors also to be provided with narrow band pass filter 15, and the FSO signal that the FSO sender unit sends is earlier through variable optical attenuation sheet 11; Through narrow band pass filter 15, arrive FSO signal sensor 12 at last again.，
Please refer to Fig. 3, is the structural representation of the 3rd embodiment of FSO signal receiving device of the present invention, and the difference of Fig. 3 and Fig. 1 comprises: position detector 16.
Wherein, Comprise in a plurality of attenuation region on the variable optical attenuation sheet 11: first attenuation region; Preferably this first attenuation region is 0 to the degree of decay of FSO signal; And a plurality of attenuation region are according to the magnitude relationship to the degree of decay of FSO signal, according to clockwise direction or according to counterclockwise branch to being arranged in successively on the variable optical attenuation sheet 11.
Position detector 16; Be used to detect the position of first attenuation region; The purpose that detects the position of first attenuation region is: because attenuation region is to the degree of decay presenting direction property of FSO signal; Therefore processor 13 can use first attenuation region the position as a reference, confirm that motor 14 drives the direction of rotation of variable optical attenuation sheets 11, thereby apace the degree of decay of 11 pairs of FSO signals of variable optical attenuation sheet adjusted to suitable stage.In one embodiment; Position detector 16 can comprise: infrared-emitting diode and infrared phototriode, and the FSO signal receiving device also comprises: reflecting piece 17, this reflecting piece 17 is arranged in first attenuation region; Can be the middle part or the edge of first attenuation region; For example variable optical attenuation sheet 11 realizes that first attenuation region is the 0dB attenuation region to the asymptotic expression decay of 0～40 dB of FSO signal, and reflecting piece can be arranged on the intersection of 0db attenuation region and 40dB attenuation region so; Simultaneously, reflecting piece 17 and position detector 16 over against the time, the air line distance of reflecting piece 17 and position detector 16 is in infrared external reflection distance (for example: in the 3.5mm), to guarantee normally to receive the infrared signal that reflecting piece 17 is returned; Particularly; The position process that position detector 16 detects first attenuation region is following: in the time need detecting the position of first attenuation region; Processor 13 sends position detection signal to position detector 16, and indication motor 14 drives slowly rotation of variable optical attenuation sheet 11 simultaneously; After position detector 16 receives position detection signal; Through infrared-emitting diode emission infrared signal; If infrared phototriode can receive the infrared signal of reflected back; To show so current and position detector 16 over against the zone be first attenuation region, processor can be judged the position of first decay area thus.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosedly be merely preferred embodiment of the present invention; Certainly can not limit the present invention's interest field with this; One of ordinary skill in the art will appreciate that all or part of flow process that realizes the foregoing description; And, still belong to the scope that invention is contained according to the equivalent variations that claim of the present invention is done.

Claims (7)

1. FSO FSO signal receiving device; It is characterized in that; Comprise: variable optical attenuation sheet, FSO signal sensor, motor and processor, said FSO signal sensor all is connected with said processor with said motor, and said variable optical attenuation sheet comprises a plurality of attenuation region; And each attenuation region is different to the degree of decay of FSO signal, and said variable optical attenuation sheet is connected with said motor;
Said FSO signal sensor, be used to receive by the emission of FSO sender unit and by the FSO signal after the said variable optical attenuation sheet decay;
Said processor when being used for intensity when a said FSO signal less than first luminous intensity, is controlled the said variable optical attenuation sheet of said driven by motor to the attenuation region rotation littler to the degree of decay of FSO signal;
Said processor; When also being used for intensity when a said FSO signal greater than second luminous intensity; Control the said variable optical attenuation sheet of said driven by motor to the attenuation region rotation bigger to the degree of decay of FSO signal, said second luminous intensity is greater than said first luminous intensity.
2. FSO signal receiving device as claimed in claim 1 is characterized in that, said FSO signal sensor comprises: avalanche diode APD detector.
3. FSO signal receiving device as claimed in claim 1 is characterized in that, a said FSO signal comprises: the communicate optical signal of 850nm or the communicate optical signal of 1550nm.
4. FSO signal receiving device as claimed in claim 1 is characterized in that, also comprises: narrow band pass filter;
Said narrow band pass filter is positioned on the light transmission path of said variable optical attenuation sheet and said FSO signal sensor.
5. like each described FSO signal receiving device among the claim 1-4, it is characterized in that the shape of said variable optical attenuation sheet comprises: circle, annular, ellipse or oval ring; Said a plurality of attenuation region is arranged on said variable optical attenuation sheet according to the magnitude relationship to FSO signal attenuation degree in the direction of the clock or by counter clockwise direction successively.
6. FSO signal receiving device as claimed in claim 5 is characterized in that, comprises first attenuation region in said a plurality of attenuation region; Said FSO signal receiving device also comprises: position detector;
Said position detector is connected with said processor, is used to detect the position of said first attenuation region;
Said processor is used for when the rotation of the said variable optical attenuation sheet of the said driven by motor of control, with the position of said first attenuation region as a reference, confirms the direction of the said variable optical attenuation sheet rotation of said driven by motor.
7. FSO signal receiving device as claimed in claim 6 is characterized in that, said position detector comprises: infrared-emitting diode and infrared phototriode; Said FSO signal receiving device also comprises: reflecting piece; Said reflecting piece is arranged on said first attenuation region; And when said reflecting piece and said position detector over against the time, the distance of said reflecting piece and said position detector is in the reflective distance of infrared signal;
Said infrared-emitting diode is used to launch infrared signal;
Said infrared phototriode is used to receive the infrared signal of said reflecting piece reflected back;
Said processor also is used for when said infrared phototriode receives said infrared signal, judge current and said position detector over against the zone be said first attenuation region.
CN201110420287XA 2011-12-15 2011-12-15 Free-space optical (FSO) signal receiving device Pending CN102437877A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983616A (en) * 2014-05-30 2014-08-13 南京信息工程大学 Transmission type visibility measurement device and system linear dynamic range expansion method
CN104333445A (en) * 2014-11-24 2015-02-04 国网吉林省电力有限公司信息通信公司 Chaotic encryption method for safety of FSO (Free Space Optics)
CN114422026A (en) * 2021-12-09 2022-04-29 武汉华中天经通视科技有限公司 Self-stabilization device and method for space optical communication channel

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US5325459A (en) * 1992-02-25 1994-06-28 Hewlett-Packard Company Optical attenuator used with optical fibers and compensation means
US5642456A (en) * 1993-09-14 1997-06-24 Cogent Light Technologies, Inc. Light intensity attenuator for optical transmission systems
US6122084A (en) * 1998-03-03 2000-09-19 At&T Corp. High dynamic range free-space optical communication receiver
US20040202474A1 (en) * 2001-05-07 2004-10-14 Britz David M. Free space duplexed optical communication with transmitter end multiplexing and receiver end amplification
CN1835421A (en) * 2006-04-14 2006-09-20 南京邮电大学 Automatic control method of receiving hight power through free space optical communication system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2047672U (en) * 1988-09-01 1989-11-15 北京清河毛纺织厂 Photoelectrical weft finder based on infra-red reflection
US5325459A (en) * 1992-02-25 1994-06-28 Hewlett-Packard Company Optical attenuator used with optical fibers and compensation means
US5642456A (en) * 1993-09-14 1997-06-24 Cogent Light Technologies, Inc. Light intensity attenuator for optical transmission systems
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US20040202474A1 (en) * 2001-05-07 2004-10-14 Britz David M. Free space duplexed optical communication with transmitter end multiplexing and receiver end amplification
CN1835421A (en) * 2006-04-14 2006-09-20 南京邮电大学 Automatic control method of receiving hight power through free space optical communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983616A (en) * 2014-05-30 2014-08-13 南京信息工程大学 Transmission type visibility measurement device and system linear dynamic range expansion method
CN104333445A (en) * 2014-11-24 2015-02-04 国网吉林省电力有限公司信息通信公司 Chaotic encryption method for safety of FSO (Free Space Optics)
CN114422026A (en) * 2021-12-09 2022-04-29 武汉华中天经通视科技有限公司 Self-stabilization device and method for space optical communication channel

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Application publication date: 20120502