CN102412499B - Adjustable ring-shaped cavity erbium-doped optical-fiber multi-wavelength laser based on cascade HiBi optical fibers and Sagnac rings - Google Patents
Adjustable ring-shaped cavity erbium-doped optical-fiber multi-wavelength laser based on cascade HiBi optical fibers and Sagnac rings Download PDFInfo
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- CN102412499B CN102412499B CN 201110283346 CN201110283346A CN102412499B CN 102412499 B CN102412499 B CN 102412499B CN 201110283346 CN201110283346 CN 201110283346 CN 201110283346 A CN201110283346 A CN 201110283346A CN 102412499 B CN102412499 B CN 102412499B
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Abstract
The invention relates to an adjustable ring-shaped cavity erbium-doped optical-fiber multi-wavelength laser based on cascade HiBi optical fibers and Sagnac rings, comprising two optical circulators and two Sagnac ring-shaped filters, wherein each Sagnac ring-shaped filter comprises 3dB optical couplers, a high-birefringence optical fiber and a polarization controller; the high-birefringence optical fibers and the polarization controllers are connected in series, and the other ends of the high-birefringence optical fibers and the polarization controllers are respectively connected with same-direction ports of the 3dB optical couplers; a pump source is connected with an erbium-doped optical fiber by a wavelength division multiplexer; the other end of the erbium-doped optical fiber is connected with the first optical circulator; the first optical circulator is connected with the first 3dB optical coupler and is connected with the second optical circulator, the second optical circulator is connected with the second 3dB optical coupler and is connected with the input end of an optical coupler; a large-splitting-ratio port of the optical coupler is connected with a port of the wavelength division multiplexer; a small-splitting-ratio port of the optical coupler is used as a laser output port; and all the components adopt optical-fiber connection. The laser has the advantages of simple structure, low cost, easy integration of optical-fiber systems and wide adjustment range.
Description
Technical field
The invention belongs to the optical information technical field, be specifically related to a kind of adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring.
Background technology
Wavelength division multiplexing (WDM) technology is one of technology of core the most in present optical communication network, and this technology can improve transmission capacity significantly on same optical fiber.In order to build wavelength-division multiplex system, the most traditional light source package adopts a plurality of single wavelength lasers exactly, satisfies the requirement of channel quantity by the quantity that increases single wavelength laser, and obviously, this has just improved the manufacturing cost of whole system and the complexity of structure.
Along with the development of wavelength-division multiplex technique, stable performance, have multi-wavelength output, low-cost, optical fiber is compatible, tunable range widely multiple-wavelength laser become gradually researcher's the focus of attention.Such laser has comparatively widely in optical communication system, industrial processes, sensory field, monitoring field etc. to be used.
The technical scheme of traditional multiple-wavelength laser generally can both stably be exported a plurality of wavelength, but, the defective of its existence is: complicated structure, and quantity, wavelength output gap, Laser output live width, wavelength output area for wavelength can't be controlled easily, thereby greatly limited the application of multiple-wavelength laser, hindered the development of multiple-wavelength laser technology.As, China Patent No. ZL200620106571.4 discloses a kind of multi-wave optical fiber laser with linear structure, and it adopts single Sagnac ring to realize multi-wavelength output as comb filter, and there is the less defective of tunable range in it.
Summary of the invention
There is expensive, complex structure, the deficiency such as can not controls easily for quantity, wavelength output gap, Laser output live width, the output wavelength scope of wavelength output for existing multiple-wavelength laser, the present invention proposes a kind of adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring.
the present invention takes following technical scheme: the adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring comprises pumping source, wavelength division multiplexer, Er-doped fiber, the first optical circulator, the second optical circulator, a Sagnac loop filter, the 2nd Sagnac loop filter, optical coupler, a described Sagnac loop filter comprises a 3dB optical coupler, the first hi bi birefringence fiber and the first Polarization Controller, the first hi bi birefringence fiber and the first Polarization Controller are connected by optical fiber, the other end of the first hi bi birefringence fiber, the first Polarization Controller respectively with a 3dB optical coupler in the same way port be connected by optical fiber, described the 2nd Sagnac loop filter comprises the 2nd 3dB optical coupler, the second hi bi birefringence fiber and the second Polarization Controller, the second hi bi birefringence fiber and the second Polarization Controller are connected by optical fiber, the other end of the second hi bi birefringence fiber, the second Polarization Controller respectively with the 2nd 3dB optical coupler in the same way port be connected by optical fiber, pumping source is connected by optical fiber with the input port of wavelength division multiplexer, the output port of wavelength division multiplexer is connected by optical fiber with an end of Er-doped fiber, the another port of Er-doped fiber is connected by optical fiber with the first port of the first optical circulator, the second port of the first optical circulator is connected by optical fiber with a port of a 3dB optical coupler of a Sagnac loop filter, the 3rd port of the first optical circulator is connected by optical fiber with the first port of the second optical circulator, the second port of the second optical circulator is connected by optical fiber with a port of the 2nd 3dB optical coupler of the 2nd Sagnac loop filter, the 3rd port of the second optical circulator is connected by optical fiber with the input of optical coupler, the large splitting ratio port of optical coupler is connected by optical fiber with the port of wavelength division multiplexer, form loop, the port of the little splitting ratio of optical coupler is as the Laser output port.
Preferably, the gain ranging of Er-doped fiber is 1530nm to 1570nm.
Preferably, the length of the first hi bi birefringence fiber is chosen as 1 meter and 5 meters, and birefringence is 0.0003.
Preferably, the length of the second hi bi birefringence fiber is chosen as 1 meter and 2 meters, and birefringence is 0.0003.
Preferably, the working range of optical coupler is 1530nm to 1580nm.
Regulate the first Polarization Controller or the second Polarization Controller, control two in first and second Sagnac loop filter and restraint the phase parameter of the light of propagating in opposite direction, just the filtering characteristic of two Sagnac loop filters be can regulate, thereby wavelength interval and the wavelength output wave band of multiwavelength laser output finally regulated.
Change the length of the hi bi birefringence fiber in two Sagnac loop filters, can change respectively wavelength interval and the laser linewidth of multiwavelength laser output, the rule of obeying is that the Laser output interval is determined by shorter hi bi birefringence fiber length, shorter hi bi birefringence fiber length is longer, and the Laser output interval is less; The Laser output live width is by the optical fiber with double refractive index length decision of growing tall, and the optical fiber with double refractive index length of growing tall is longer, and the Laser output live width is narrower.
Adopt two optical circulators in technical solution of the present invention, can isolate preferably the reverberation of Sagnac loop filter to the impact of Er-doped fiber.
The present invention utilizes the cascade of Sagnac loop filter to realize the tunable multi-wavelength Laser output as comb filter.
The present invention is based on the process of the Er-doped fiber multiwavelength laser output of high refraction optical fiber Sagnac ring cascade:
1, according to the output wavelength scope of the required multi-wavelength optical fiber laser that obtains, select the Er-doped fiber of corresponding gain ranging, and determine Er-doped fiber length according to loop loss.
2, select operating wavelength range to cover optical circulator and the optical coupler of the output wavelength scope of the multi-wavelength optical fiber laser that need to obtain.
3, according to the output wavelength interval of the required multi-wavelength optical fiber laser that obtains, the Sagnac interference ring of selecting the shorter hi bi birefringence fiber of appropriate length to form.
4, according to the Output of laser live width of the required multi-wavelength optical fiber laser that obtains, the Sagnac interference ring of selecting the optical fiber with double refractive index that grows tall to form, the Output of laser live width is determined by the optical fiber with double refractive index length of growing tall.
5, open pumping source, regulate the pumping source power output, regulate the Polarization Controller in two Sagnac loop filters, multiple-wavelength laser realizes stablizing multi-wavelength output.
The present invention adopts the cascade of high birefringence rate Sagnac ring to realize multi-wavelength output as comb filter, compare single Sagnac ring and realize the laser of multi-wavelength output as comb filter, its tunable range is wider, comprise and to carry out tuning to multi-wavelength output gap, output wavelength scope, Laser output live width etc., the Laser output interval determines by shorter hi bi birefringence fiber length, and the longer Laser output of shorter hi bi birefringence fiber length interval is less; The Laser output live width is by the optical fiber with double refractive index length decision of growing tall, and the optical fiber with double refractive index length of growing tall is longer, and the Laser output live width is narrower.This makes based on the potentiality of multiple-wavelength laser in wavelength-division multiplex system of high birefringence rate Sagnac ring cascade larger, applicatory wider general.
Laser of the present invention simple in structure, cost is low, be easy to that fibre system is integrated, tunable range is extensive, can can control easily to the wavelength number of multiwavelength laser output, output wavelength scope, wavelength interval, live width etc. the good stability of Laser output.It is specially adapted to the technical fields such as optical communication, light sensing, light detection.
Description of drawings
Fig. 1 is the structural representation of laser of the present invention.
Fig. 2 (a), 2 (b) are the stable multiwavelength laser output spectrum figure of the embodiment of the present invention.
The spectrogram that Fig. 3 (a), 3 (b), 3 (c) realize that by regulating Polarization Controller the wavelength output area changes for the embodiment of the present invention.
The spectrogram that Fig. 4 (a), 4 (b) realize that by changing shorter hi bi birefringence fiber length the wavelength output gap changes for the embodiment of the present invention.
The spectrogram that Fig. 5 (a), 5 (b) realize that by changing the optical fiber with double refractive index length of growing tall the Laser output live width changes for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
As shown in Figure 1, the adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring comprises pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, the first optical circulator 4-1 and the second optical circulator 4-2, a Sagnac loop filter 9-1 and the 2nd Sagnac loop filter 9-2, optical coupler 8.
The gain ranging of Er-doped fiber 3 is 1530nm to 1570nm.The working range of optical coupler 8 is 1530nm to 1580nm, and the port d of optical coupler 8 little splitting ratios is as the Laser output port.The one Sagnac loop filter 9-1 comprises a 3dB optical coupler 5-1, the first hi bi birefringence fiber 6-1 and the first Polarization Controller 7-1, the first hi bi birefringence fiber 6-1 and the first Polarization Controller 7-1 connect by optical fiber, the other end of the first hi bi birefringence fiber 6-1, the first Polarization Controller 7-1 respectively with a 3dB optical coupler 5-1 in the same way (two) port be connected by optical fiber, the length of the first hi bi birefringence fiber 6-1 is chosen as 1 meter and 5 meters, and birefringence is 0.0003.The 2nd Sagnac loop filter 9-2 comprises the 2nd 3dB optical coupler 5-2, the second hi bi birefringence fiber 6-2 and the second Polarization Controller 7-2, the second hi bi birefringence fiber 6-2 and the second Polarization Controller 7-2 connect by optical fiber, the other end of the second hi bi birefringence fiber 6-2, the second Polarization Controller 7-2 respectively with the 2nd 3dB optical coupler 5-2 in the same way (two) port be connected by optical fiber, the length of the second hi bi birefringence fiber 6-2 is chosen as 1 meter and 2 meters, and birefringence is 0.0003.
Open pumping source 1, regulate the power output of pumping source 1, control laser output power.Select the Er-doped fiber 3 of appropriate length, under the effect of pumping source 1, its length satisfies the required gain of generation multiwavelength laser.In order to reduce as much as possible loss, in annular chamber, the tie point of each device directly is welded together, and chooses the optical coupler 8 of 80: 20, makes it for laser cavity provides enough feedbacks, can make again power output maximum.Obtain stablizing multiwavelength laser output as shown in Fig. 2 (a), the stable output of multi-wavelength optical fiber laser, as shown in Fig. 2 (b), the laser output jitter less than 0.1dB, has been realized the stable output of fiber laser multi-wavelength in the continuous sweep of 10 minutes.
Regulate the first Polarization Controller 7-1 and the second Polarization Controller 7-2, control the filtering characteristic of a Sagnac loop filter 9-1 and the 2nd Sagnac loop filter 9-2, finally control multiwavelength laser output output wavelength scope.C-wave band short wavelength region multiwavelength laser output as shown in Fig. 3 (a), Fig. 3 (b) is whole C-wave band multiwavelength laser output, the output of the multiwavelength laser of C-wave band long wavelength region shown in Fig. 3 (c).
Adopt the first hi bi birefringence fiber 6-1 and the second hi bi birefringence fiber 6-2 of appropriate length, control wavelength interval and the laser linewidth of multiwavelength laser output, its rule of observing is that the Laser output interval is determined by shorter hi bi birefringence fiber length, shorter hi bi birefringence fiber length is longer, and the Laser output interval is less; The Laser output live width is by the optical fiber with double refractive index length decision of growing tall, and the optical fiber with double refractive index length of growing tall is longer, and the Laser output live width is narrower.The first hi bi birefringence fiber length is selected 5 meters as shown in Fig. 4 (a), and the second hi bi birefringence fiber length is selected the multiwavelength laser output spectrum figure of 1 meter; The first hi bi birefringence fiber length is selected 5 meters as shown in Fig. 4 (b), and the second hi bi birefringence fiber length is selected the multiwavelength laser output spectrum figure of 2 meters.The first hi bi birefringence fiber length is selected 1 meter as shown in Fig. 5 (a), and the second hi bi birefringence fiber length is selected the multiwavelength laser output spectrum figure of 1 meter; The first hi bi birefringence fiber length is selected 5 meters as shown in Fig. 5 (b), and the second hi bi birefringence fiber length is selected the multiwavelength laser output spectrum figure of 1 meter.
The present invention can obtain stable tunable multiwavelength laser output, its length by Polarization Controller, hi bi birefringence fiber to multiwavelength laser output carry out tuning.The power output of its multi-wavelength and number are subjected to the restrictions such as pumping light power, length of ring cavity.Along with the development of various photoelectric devices, will obtain more stable, wider adjustable wide-band, and its application also will be more extensive.
Above the preferred embodiments of the present invention and principle are had been described in detail, for those of ordinary skill in the art, according to thought provided by the invention, will change on embodiment, and these changes also should be considered as protection scope of the present invention.
Claims (3)
1. based on the adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser of Cascade H iBi optical fiber Sagnac ring, it is characterized in that comprising pumping source, wavelength division multiplexer, Er-doped fiber, the first optical circulator, the second optical circulator, a Sagnac loop filter, the 2nd Sagnac loop filter, optical coupler; The gain ranging of described Er-doped fiber is 1530nm to 1570nm; The working range of described optical coupler is 1530nm to 1580nm;
A described Sagnac loop filter comprises a 3dB optical coupler, the first hi bi birefringence fiber and the first Polarization Controller, the first hi bi birefringence fiber and the first Polarization Controller are connected by optical fiber, the other end of the first hi bi birefringence fiber, the first Polarization Controller respectively with a 3dB optical coupler in the same way port be connected by optical fiber; Described the 2nd Sagnac loop filter comprises the 2nd 3dB optical coupler, the second hi bi birefringence fiber and the second Polarization Controller, the second hi bi birefringence fiber and the second Polarization Controller are connected by optical fiber, the other end of the second hi bi birefringence fiber, the second Polarization Controller respectively with the 2nd 3dB optical coupler in the same way port be connected by optical fiber;
pumping source is connected by optical fiber with the input port of wavelength division multiplexer, the output port of wavelength division multiplexer is connected by optical fiber with an end of Er-doped fiber, the another port of Er-doped fiber is connected by optical fiber with the first port of the first optical circulator, the second port of the first optical circulator is connected by optical fiber with a port of a 3dB optical coupler of a Sagnac loop filter, the 3rd port of the first optical circulator is connected by optical fiber with the first port of the second optical circulator, the second port of the second optical circulator is connected by optical fiber with a port of the 2nd 3dB optical coupler of the 2nd Sagnac loop filter, the 3rd port of the second optical circulator is connected by optical fiber with the input of optical coupler, the large splitting ratio port of optical coupler is connected by optical fiber with the port of wavelength division multiplexer, form loop, the port of the little splitting ratio of optical coupler is as the Laser output port.
2. the adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring as claimed in claim 1, it is characterized in that: the length of described the first hi bi birefringence fiber is chosen as 1 meter and 5 meters, and birefringence is 0.0003.
3. the adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser based on Cascade H iBi optical fiber Sagnac ring as claimed in claim 1, it is characterized in that: the length of described the second hi bi birefringence fiber is chosen as 1 meter and 2 meters, and birefringence is 0.0003.
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| CN103840359B (en) * | 2014-03-25 | 2016-05-04 | 太原理工大学 | A kind of tunable multi-wavelength is stablized narrow cable and wide optical fiber laser |
| CN105841839B (en) * | 2016-03-22 | 2018-09-21 | 北京信息科技大学 | A method of utilizing optical fiber sagnac interferometer measuring temperature field |
| CN110048295B (en) * | 2019-04-29 | 2020-07-24 | 杭州电子科技大学 | Wavelength interval tunable single-wavelength and double-wavelength fiber laser based on Sagnac ring |
| CN113572003B (en) * | 2021-07-05 | 2022-04-29 | 杭州电子科技大学 | Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings |
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| US5513194A (en) * | 1994-06-30 | 1996-04-30 | Massachusetts Institute Of Technology | Stretched-pulse fiber laser |
| CN100428041C (en) * | 2006-08-10 | 2008-10-22 | 浙江大学 | Method and device for multi-wavelength stable output of ring structure optical fiber laser |
| CN201004143Y (en) * | 2006-08-10 | 2008-01-09 | 浙江大学 | A multi-wave optical fiber laser with linear structure |
| CN101257177A (en) * | 2008-03-06 | 2008-09-03 | 上海交通大学 | Self-excitation multiple wavelength Brillouin erbium-doped optical fiber laser |
| CN101483308A (en) * | 2009-02-03 | 2009-07-15 | 江西师范大学 | Precise tunable multiple wavelength annular optical fiber laser |
| CN202260108U (en) * | 2011-09-22 | 2012-05-30 | 杭州电子科技大学 | Adjustable ring-cavity erbium-doped optical fiber multi-wavelength laser |
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