WO2015149249A1 - Filtre réglable, ensemble optique réglable et système de réseau optique passif - Google Patents

Filtre réglable, ensemble optique réglable et système de réseau optique passif Download PDF

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Publication number
WO2015149249A1
WO2015149249A1 PCT/CN2014/074452 CN2014074452W WO2015149249A1 WO 2015149249 A1 WO2015149249 A1 WO 2015149249A1 CN 2014074452 W CN2014074452 W CN 2014074452W WO 2015149249 A1 WO2015149249 A1 WO 2015149249A1
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WO
WIPO (PCT)
Prior art keywords
filter
optical
etalon filter
etalon
optical signal
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PCT/CN2014/074452
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English (en)
Chinese (zh)
Inventor
刘德坤
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/074452 priority Critical patent/WO2015149249A1/fr
Priority to CN201480000118.2A priority patent/CN105264908B/zh
Publication of WO2015149249A1 publication Critical patent/WO2015149249A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29358—Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator

Definitions

  • the present invention relates to the field of communications, and in particular, to a tunable filter, a dimmable component, and a passive optical network system.
  • the tunable device is one of the core devices in the field of optical fiber communication, which plays a key role in the adaptability and flexibility of the optical network, and the passive optical network with time division multiplexing/wavelength division multiplexing hybrid
  • PON Passive Optical Network
  • the tunable device mainly includes two modules: a tunable transmitter and a tunable receiver, wherein for the tunable receiver, the core device is a tunable filter, but due to the complicated manufacturing process of the tunable filter , the production cost is high, it has not been widely used in the field of optical fiber communication.
  • the present technology provides a tunable filter based on a liquid crystal material, which is plated with a high-reflection film on both end faces of the liquid crystal material to form a method.
  • a tunable filter of the Fabry-Perot (FP) cavity and then changing the refractive index of the liquid crystal material by changing the voltage applied to the liquid crystal material, thereby changing the transmission curve of the tunable filter, ie changing The wavelength of the tunable filter.
  • the transmission curve of the tunable filter having a single FP cavity is a typical Lorentz curve, that is, if it is necessary to ensure that the tunable filter has a certain degree of isolation, the bandwidth is It will be small, and if its bandwidth is designed to be wide, its isolation will be low, and it will not meet the bandwidth and isolation requirements of the tunable filter in the field of fiber communication.
  • the invention provides a tunable filter, a tunable optical component and a passive optical network system, which can solve the problem that the prior art cannot simultaneously satisfy the bandwidth of the tunable filter in the field of optical fiber communication. And technical issues of isolation requirements.
  • a tunable filter comprising:
  • Etalon filter second Etalon filter and temperature controller
  • first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes, and the first Etalon filter and the second Etalon filter are plated with a reflective film;
  • the temperature controller is disposed on a surface of the first Etalon filter or the second Etalon filter;
  • One end of the first Etalon filter is connected to one end of the second Etalon filter by an adhesive, and the other end of the first Etalon filter is connected to the other end of the second Etalon filter by an adhesive;
  • a thickness of an adhesive for connecting one end of the first Etalon filter to one end of the second Etalon filter is greater than a connection for connecting the other end of the first Etalon filter to the second Etalon filter.
  • the thickness of the adhesive at the other end is such that the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle.
  • the thickness of the first Etalon filter is the same as the thickness of the second Etalon filter.
  • the temperature controller is a heater or a thermoelectric refrigerator; wherein the heater is a ring heater or a transparent heater;
  • the thermoelectric cooler is a ring thermoelectric cooler or a transparent thermoelectric cooler.
  • a thickness of a gap formed by the first Etalon filter and the second Etalon filter by the adhesive is less than The thickness of the first Etalon filter.
  • the adhesive is a thermal conductor.
  • the intermediate medium of the first Etalon filter and the second Etalon filter is silicon.
  • a light receiving component comprising: a tunable filter and a light receiving module;
  • the tunable filter includes: a first Etalon filter, a second Etalon filter, and a temperature controller; wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes The surface of the first Etalon filter and the second Etalon filter are plated with a reflective film; the temperature controller is disposed on a surface of the first Etalon filter or the second Etalon filter; One end of the first Etalon filter is connected to one end of the second Etalon filter by an adhesive, and the other end of the first Etalon filter is connected to the other end of the second Etalon filter by an adhesive; The thickness of the adhesive connecting one end of the first Etalon filter to one end of the second Etalon filter is greater than the other end for connecting the first Etalon filter and the other end of the second Etalon filter a thickness of the adhesive such that the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle;
  • the tunable filter is configured to perform wavelength selection on an optical signal input from an optical fiber, and transmit the selected optical signal to the optical receiving module;
  • the light receiving module is configured to receive the optical signal obtained by the wavelength selection output by the tunable filter.
  • an optical network unit including: a tunable filter, a light receiving module, a light emitting component, and an optical coupler;
  • the tunable filter includes: a first Etalon filter, a second Etalon filter, and a temperature controller; wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes The surface of the first Etalon filter and the second Etalon filter are plated with a reflective film; the temperature controller is disposed on a surface of the first Etalon filter or the second Etalon filter; One end of the first Etalon filter is connected to one end of the second Etalon filter by an adhesive, and the other end of the first Etalon filter is connected to the other end of the second Etalon filter by an adhesive; Connecting one end of the first Etalon filter to the The thickness of the adhesive at one end of the second Etalon filter is greater than the thickness of the adhesive for connecting the other end of the first Etalon filter to the other end of the second Etalon filter, such that the first Etalon a filter and the second Etalon filter are stacked in series at an oblique angle;
  • the tunable filter is configured to perform wavelength selection on the downlink optical signal, and transmit the selected downlink optical signal to the optical receiving module; the downlink optical signal is transmitted by the optical coupler to the optical fiber The optical signal is selected;
  • the light receiving module is configured to receive a downlink optical signal obtained by the wavelength selection output by the tunable filter
  • the light emitting component is configured to transmit an uplink optical signal
  • the optical coupler is configured to select an optical signal transmitted through the optical fiber to obtain the downlink optical signal, and transmit the uplink optical signal transmitted by the optical transmitting component to the optical fiber.
  • an optical line terminal includes: a tunable filter, a light receiving module, an optical splitter, a light emitting component, and an optical coupler;
  • the tunable filter includes: a first Etalon filter, a second Etalon filter, and a temperature controller; wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes The surface of the first Etalon filter and the second Etalon filter are plated with a reflective film; the temperature controller is disposed on a surface of the first Etalon filter or the second Etalon filter; One end of the first Etalon filter is connected to one end of the second Etalon filter by an adhesive, and the other end of the first Etalon filter is connected to the other end of the second Etalon filter by an adhesive; The thickness of the adhesive connecting one end of the first Etalon filter to one end of the second Etalon filter is greater than the other end for connecting the first Etalon filter and the other end of the second Etalon filter a thickness of the adhesive such that the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle;
  • the optical coupler is configured to select an optical signal transmitted through the optical fiber to obtain an uplink optical signal;
  • the optical splitter is configured to perform power allocation on the uplink optical signal;
  • the tunable filter is configured to perform wavelength selection on an uplink optical signal obtained by performing power distribution by the optical splitter, and transmit the selected uplink optical signal to the optical receiving module;
  • the light receiving module is configured to receive an uplink optical signal obtained by the wavelength selection after being output by the tunable filter;
  • the light emitting component is configured to transmit a downlink optical signal; and the number is transmitted to the optical fiber.
  • a fifth aspect of the present invention provides a passive optical network system, including: at least one optical line terminal, an optical distribution network, and a plurality of optical network units;
  • the optical network unit includes a tunable filter; the tunable filter includes: a first Etalon filter, a second Etalon filter, and a temperature controller; wherein the first Etalon filter and the first The two Etalon filters are both Etalon filters sensitive to temperature changes, the first Etalon filter and the second Etalon filter surface are plated with a reflective film; the temperature controller is disposed at the first Etalon filter Or a surface of the second Etalon filter; one end of the first Etalon filter is connected to one end of the second Etalon filter by an adhesive, and the other end of the first Etalon filter is opposite to the second The other end of the Etalon filter is connected by an adhesive; a thickness of an adhesive for connecting one end of the first Etalon filter to one end of the second Etalon filter is greater than a thickness for connecting the first Etalon filter a thickness of the adhesive at the other end and the other end of the second Etalon filter such that the first Etalon filter and the second Etalon filter are stacked in
  • the at least one optical line terminal is coupled to the plurality of optical network units in a point-to-multipoint manner over the optical distribution network.
  • the invention provides a tunable filter, a dimmable component and a passive optical network system, the tunable filter comprising a first Etalon filter, a second Etalon filter and a first Etalon filter or a second Etalon filter
  • the temperature controller of the surface of the device wherein the first Etalon filter and the second Etalon filter are sensitive to temperature changes Etalon filter, and the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle, while satisfying the requirements of the bandwidth and isolation of the tunable filter in the field of optical fiber communication, and avoiding the optical signal in the first Etalon An interference is formed between the filter and the second Etalon filter.
  • FIG. 1 is a schematic structural diagram of a PON system according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a composition of a TWDM PON system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a configuration of a tunable filter according to Embodiment 1 of the present invention
  • FIG. 4 is a transmission curve diagram of a tunable filter according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic diagram of an adjustable filter provided with a heating resistor according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram showing the composition of a first Etalon filter according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic diagram showing the composition of a second Etalon filter according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic diagram of a composition of an optical receiving component according to Embodiment 2 of the present invention
  • FIG. 9 is a schematic diagram of a configuration of an optical network unit according to Embodiment 3 of the present invention
  • FIG. 1 is a schematic structural diagram of a passive optical network system according to Embodiment 5 of the present invention.
  • system and “network” are often used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, and both A and B exist separately. B these three situations.
  • the character " /" in this article generally indicates that the contextual object is an "or" relationship.
  • the PON system shown in FIG. 1 specifically includes: an Optical Line Termination (OLT), an Optical Distribution Network (ODN), and at least one Optical Network Unit (ONU). ).
  • the OLT may include a transmitter, a receiver, and a Wavelength Division Multiplexer (WDM); the ODN may transmit the downlink optical signal of the OLT to the at least one ONU, and may also uplink the optical signal in the at least one ONU.
  • WDM Wavelength Division Multiplexer
  • the ODN is generally divided into three parts: a passive optical splitter (splitter), a trunk optical fiber, and a branch optical fiber; the ONU provides a user-side interface for the PON system, which can Includes; transmitter, receiver, and WDM.
  • the transmission from the OLT to the ONU is called downlink
  • the transmission from the ONU to the OLT is called uplink.
  • the optical signal transmitted from the OLT to the ONU is called a downlink optical signal.
  • the optical signal transmitted from the ONU to the OLT is referred to as an upstream optical signal.
  • the downlink optical signal is broadcasted by the OLT to at least one ONU, and the uplink optical signal of each ONU in at least one ONU is transmitted to the OLT in a time division multiplexing manner.
  • the industry has expanded the PON system shown in Figure 1, and obtained the Time Wavelength Division Multiplexing (TWDM) PON system as shown in Figure 2.
  • TWDM Time Wavelength Division Multiplexing
  • the OLT may include four transmitters, and the four transmitters respectively emit optical signals of different wavelengths, pass through the combiner to enter the trunk fiber, and then transmit to the ONU.
  • the OLT may include four transmitters, and the four transmitters respectively emit optical signals of different wavelengths, pass through the combiner to enter the trunk fiber, and then transmit to the ONU.
  • the OLT may include four transmitters, and the four transmitters respectively emit optical signals of different wavelengths, pass through the combiner to enter the trunk fiber, and then transmit to the ONU.
  • the OLT may include four transmitters, and the four transmitters respectively emit optical signals of different wavelengths, pass through the combiner to enter the trunk fiber, and then transmit to the ONU.
  • the OLT may include four transmitters, and the four transmitters respectively emit optical signals of different wavelengths, pass through the combiner to
  • any of the transmitters included in the ONU can also emit optical signals of one of four different wavelengths, so that at any one time, there are four different wavelengths of optical signals on the line, as well as for the transmitter.
  • the core device laser four different lasers can be used, or a laser can be used and adjusted to a specific wavelength as needed to reduce the number of ONUs.
  • WDM in OLT and ONU is a filter used to aggregate or separate uplink and downlink optical signals.
  • the tunable filter is the core component of the ONU.
  • the tunable filter needs to be packaged into a Transistor-Outline can (TO-can), which is small in size, low in cost and simple in control. , and need enough bandwidth and isolation.
  • Embodiments of the present invention provide a tunable filter that can simultaneously satisfy the requirements for bandwidth and isolation of a tunable filter in the field of fiber optic communications.
  • Embodiment 1 of the present invention provides a tunable filter 10, as shown in FIG. 3, the tunable filter 10 may include: a first Etalon filter 1 1 , a second Etalon filter 12 , and temperature control 13.
  • the first Etalon filter 1 1 and the second Etalon filter 12 are both temperature-sensitive Etalon filters, and the first Etalon filter 1 1 and the second Etalon filter 12 are coated with a reflective film.
  • the temperature controller 13 is disposed on the surface of the first Etalon filter 11 or the second Etalon filter 12, so that the first Etalon filter can be changed by the temperature controller 13.
  • the temperature controller 13 may be disposed on the surface of the first Etalon filter 1 1 (as shown in FIG. 3 ).
  • the temperature controller 13 also It may be disposed on the surface of the second Etalon filter 12 (not shown in FIG. 3), and the temperature controller 13 is specifically disposed on the surface of the first Etalon filter 11 or on the surface of the second Etalon filter 12,
  • the embodiments of the present invention are not specifically limited herein.
  • the specific setting position of the surface of the first Etalon filter 11 or the second Etalon filter 12 of the temperature controller 13 is not specifically limited herein.
  • the setting of the temperature controller 13 can be based on actual conditions. Select the requirements of the application scenario.
  • the tunable filter 10 may include one or more temperature controllers 13.
  • the temperature controllers are plural, they may be disposed on the first Etalon filter or simultaneously in the second Etalon. On the filter, at this time, only two temperature controllers need to be controlled to keep the temperature of the two Etalon filters consistent.
  • the adhesive can use adhesive with thermal conductivity. An adhesive having no thermal conductivity can be used.
  • One end of the first Etalon filter 11 is connected to one end of the second Etalon filter 12 via an adhesive 14, and the other end of the first Etalon filter 11 is connected to the other end of the second Etalon filter 12 via an adhesive 15.
  • the adhesive 14 for connecting one end of the first Etalon filter 11 to one end of the second Etalon filter 12, and the first Etalon filter 1 1 are connected.
  • the adhesive 15 at the other end and the other end of the second Etalon filter 12 may be two different adhesives or different portions of the same adhesive.
  • the thickness of the adhesive 14 for connecting one end of the first Etalon filter 1 1 to one end of the second Etalon filter 12 is greater than the other end for connecting the other end of the first Etalon filter 11 to the second Etalon filter 12
  • the thickness of the adhesive 15 at one end is such that the first Etalon filter 1 1 and the second Etalon filter 12 are stacked in series at an oblique angle to form Wedge-shaped gap. In this way, it is possible to prevent the optical signal from forming interference between the first Etalon filter 1 1 and the second Etalon filter 12.
  • the specific degree of the tilt angle formed between the first Etalon filter 11 and the second Etalon filter 12 by the adhesive 14 and the adhesive 15 may be according to the actual application scenario.
  • the embodiment of the present invention is not specifically limited herein, as required by setting the thickness of the adhesive 14 and the adhesive 15.
  • the interference is not formed, and it is ensured that the temperature changes of the first Etalon filter 11 and the second Etalon filter 12 are substantially the same when the temperature of the temperature controller 13 is changed.
  • the first Etalon filter 11 is a filter composed of an FP etalon (ie, the first Etalon filter 11 has an FP cavity), that is, the wavelength of the optical signal of the first Etalon filter 11
  • the optical signal With selective action, only the optical signal whose wavelength satisfies the FP cavity resonance condition can pass through the first Etalon filter 1 1 , otherwise the optical signal will be seriously attenuated when passing through the first Etalon filter 1 1 , specifically when the optical signal
  • the wavelength is equal to an integral multiple of the optical path difference between the two reflecting surfaces of the first Etalon filter 1 1 , the optical signal can pass through the first Etalon filter 1 1 , otherwise the optical signal passes through the first Etalon filter 1 1 will be severely attenuated; wherein the optical path difference between the two reflecting surfaces of the first Etalon filter 1 1 is equal to the distance between the two reflecting surfaces of the first Etalon filter 11 and the first Etalon filter
  • first Etalon filter 1 1 is an Etalon filter sensitive to temperature changes, so that the refractive index of the intermediate medium of the first Etalon filter 1 1 can be changed by changing the temperature of the first Etalon filter 1 1
  • An Etalon filter 1 1 transmission curve is moved to change the wavelength of the optical signal that can pass through the first Etalon filter 11.
  • the second Etalon filter 12 is also a filter composed of a FP etalon (ie, the second Etalon filter 12 has an FP cavity), that is, the second Etalon.
  • the filter 12 also has a selective effect on the wavelength of the optical signal, and only the optical signal whose wavelength satisfies the FP cavity resonance condition can pass through the second Etalon filter 12, otherwise the optical signal will be severely attenuated as it passes through the second Etalon filter 12.
  • the optical signal when the wavelength of the optical signal is equal to an integral multiple of the optical path difference between the two reflective surfaces of the second Etalon filter 12, the optical signal can pass through the second Etalon filter 1 2, otherwise the optical signal is When passing through the second Etalon filter 12, it will be severely attenuated; wherein, the optical path difference between the two reflecting surfaces of the second Etalon filter 12 is equal to the distance between the two reflecting surfaces of the second Etalon filter 12 and The product of the refractive indices of the intermediate medium of the two Etalon filters 12, the intermediate medium of the second Etalon filter 12 being located between the two reflecting surfaces of the second Etalon filter 12.
  • the second Etalon filter 12 is also an Etalon filter sensitive to temperature changes, so that the refractive index of the intermediate medium of the second Etalon filter 12 can be changed by changing the temperature of the second Etalon filter 12, so that the second Etalon The transmission curve of the filter 12 is shifted to change the wavelength of the optical signal that can pass through the second Etalon filter 12.
  • the curve of the transmitted light intensity of the FP cavity of a filter can be expressed as:
  • FSR Free Spectral Range
  • the thicknesses of the first Etalon filter 1 1 and the second Etalon filter 12 are the same (both A), and the inclination between the first Etalon filter 1 1 and the second Etalon filter 12 In the case of a small (for example, only 0.5 degree or less), when the optical signal is normally incident from the surface of the first etalon filter 11 or the second etalon filter 12 (ie, the incident angle of the optical signal is 0 degrees), The angular difference of the optical signal in the FP cavity of the first Etalon filter 11 and the second Etalon filter 12 can be ignored, and the reflectances of the end faces of the first Etalon filter 11 and the second Etalon filter 12 are also the same, first The materials of the intermediate medium of the Etalon filter 11 and the second Etalon filter 12 are also the same, and the tunable filter 10 composed of the first elan filter 11 and the second Etalon filter 12 can be obtained according to the formula (1).
  • the transmission curve can be approximated as:
  • the thickness h of the first Etalon filter 11 and the second Etalon filter 12 is designed according to the formula ( 2 ) to make the FSR « 450 GHz and the first
  • the end face reflectances of the Etalon filter 11 and the second Etalon filter 12 are respectively designed to be 74.5%, and the transmitted light intensity curve of the tunable filter 10 can be calculated by the formula (3), which can be obtained by measuring the transmitted light intensity curve.
  • the tunable filter 10 has a 3dB bandwidth of 27 GHz and an isolation of 100 GHz at 100 GHz. If the first Etalon filter 11 or the second Etalon filter 12 is used alone, the transmitted light of the filter is calculated by the formula (1). Strong curve, and after repeated experiments, the isolation of 100 GHz of the filter can be greater than 25 dB only when the end face reflectivity of the filter is 93.5% or more. The 3dB bandwidth is only 9GHz, so that the tunable filter 10 as shown in Fig. 3 can have both large bandwidth and high isolation.
  • the tunable filter 10 After a plurality of optical signals having different wavelengths pass through the tunable filter 10, for the wavelength For an optical signal that does not satisfy the FP cavity resonance condition, it undergoes two attenuations to make the tunable filter 10 have a better filtering effect.
  • the wavelengths of the optical signals that can pass through the first Etalon filter 1 1 and the second Etalon filter 12 are identical, one end of the first Etalon filter 11 and one end of the second Etalon filter 12 pass through in the embodiment of the present invention.
  • the adhesive 14 is connected, and the other end of the first Etalon filter 1 1 is connected to the other end of the second Etalon filter 12 via an adhesive 15, so that the tunable filter 10 is heated to cause the transmission curve to move, thereby changing
  • the uniformity of the temperatures of the first Etalon filter 11 and the second Etalon filter 12 can be ensured by the adhesive 14 and the adhesive 15 in the process of tuning the wavelength of the optical signal of the filter 10.
  • the distance between the first Etalon filter 1 1 and the second Etalon filter 12 may be designed to be 4 ⁇ small, and the adhesive 14 and the adhesive 15 are closely connected by the heat conduction, so The temperature of the first Etalon filter 1 1 and the second Etalon filter 12 can be simultaneously changed only by the temperature controller 13 above the first Etalon filter 11 or the second Etalon filter 12, and the two filters can be maintained. The temperature is always consistent.
  • the thickness of the adhesive 14 for connecting one end of the first Etalon filter 1 1 to one end of the second Etalon filter 12 is greater than the other end for connecting the other end of the first Etalon filter 11 to the second Etalon filter 12
  • the thickness of the adhesive 15 at one end is such that the first Etalon filter 1 1 and the second Etalon filter 12 are stacked in series at an oblique angle, thereby avoiding optical signals in the first Etalon filter 1 1 and the second Etalon filter 12 Interference is formed between them, thereby avoiding distortion of the transmission curve of the tunable filter 10.
  • the temperature controller 13 provided on the first Etalon filter 11 of the tunable filter 10 is a heating resistor A and a heating resistor B, as shown in FIG. 4 is a heating resistor A and heating to the tunable filter 10.
  • the heating resistor A and the heating resistor B are disposed on the first Etalon filter 11 of the tunable filter 10 (as shown in FIG. 5, the tunable filter provided with the heating resistor shown in Embodiment 3 of the present invention is only
  • the present invention provides a schematic diagram, and the present invention does not specifically limit the setting of the heating resistor.
  • the temperature of the tunable filter 10 can be changed as a whole to shift its transmission curve, thereby changing the wavelength of the optical signal that can pass through the tunable filter 10, thereby achieving wavelength tuning. It can be seen from Fig.
  • the transmission curve of the tunable filter 10 remains substantially unchanged except for the positional shift, which indicates that the first Etalon filter in the tunable filter 10
  • the temperature of the first and second Etalon filters 12 is substantially the same, and the temperature of the first Etalon filter 1 1 and the second Etalon filter 12 can be maintained consistently by heating only above or below it.
  • the tuning mode of the tunable filter 10 is simple and convenient.
  • the thickness of the first Etalon filter 11 is the same as the thickness of the second Etalon filter 12 to ensure the first Etalon filter 1 1 and the second Etalon filter 12 When the temperatures are the same, the wavelengths of the optical signals that can pass through the first Etalon filter 1 1 and the second Etalon filter 12 are the same.
  • the temperature controller 13 is a heater or a thermoelectric cooler.
  • the heater is a ring heater or a transparent heater
  • the thermoelectric cooler is a ring thermoelectric refrigerator or a transparent thermoelectric cooler.
  • the thickness of the gap formed by the first Etalon filter 1 1 and the second Etalon filter 12 by the adhesive 14 and the adhesive 15 is smaller than the first
  • the thickness of the Etalon filter 1 1 , the adhesive 14 and the adhesive 15 are both heat conductors.
  • the thermal conductor may be an optical adhesive, and the optical adhesive has good thermal conductivity, so as to better ensure that the tunable filter 10 is heated to move the transmission curve, thereby changing the light that can pass through the tunable filter 10.
  • the temperature of the first Etalon filter 1 1 and the second Etalon filter 12 are consistent during the wavelength of the signal.
  • the inclination angle between the first Etalon filter 11 and the second Etalon filter 12 is much smaller than the thickness of the first Etalon filter 11 or the second Etalon filter 12, that is, by the adhesive 14 and the adhesive. 15 having the first Etalon filter 1 1 and the second Etalon filter 12 stacked in series at an oblique angle to avoid optical signals in the first Etalon filter
  • the interference between the wave filter 11 and the second Etalon filter 12 is such that the first Etalon filter 11 and the second Etalon filter 12 are still in close proximity, thus performing the temperature controller 13 on the tunable filter 10.
  • the temperature uniformity of the first Etalon filter 11 and the second Etalon filter 12 can be further ensured to achieve a better filtering effect.
  • the first Etalon filter 11 includes: a first reflective surface 111, a second reflective surface 112, and a first reflective surface located on the first Etalon filter 11.
  • the material of the intermediate medium 113 of the first Etalon filter 11 is a refractive index high thermal coefficient material, and the first reflective surface 111 and the second reflective surface 112 of the first Etalon filter 11 are both reflective films. Since the material of the intermediate medium 113 of the first Etalon filter 11 is a material having a high refractive index coefficient, the first Etalon filter 11 is a tunable filter based on thermal tuning, and the tunable filter based on thermal tuning has Small size, simple tuning, no moving parts, high reliability and so on.
  • the first Etalon filter 11 can polish and polish a wafer with a high refractive index material to a desired thickness, and then respectively obtain the obtained after grinding.
  • a reflective film is plated on both sides of the wafer, so that a temperature-sensitive filter composed of the FP etalon can be formed, that is, the first Etalon filter 11 is obtained, and the first Etalon filter 11 is simply fabricated.
  • low cost just put it on the temperature control heat sink or add a heating electrode to change its temperature, so that its transmission curve moves, thus changing the wavelength of the optical signal that can pass through the second Etalon filter 11. , to achieve wavelength tuning function.
  • the second Etalon filter 12 includes: a first reflective surface 121, a second reflective surface 122, and a first reflective surface located on the second Etalon filter 12.
  • the material of the intermediate medium 123 of the second Etalon filter 12 is a material having a high refractive index coefficient, and the first reflective surface 121 and the second opposite surface of the second Etalon filter 12
  • the emitting surfaces 122 are all reflective films.
  • the method for fabricating the second Etalon filter 12 is the same as the method for fabricating the first Etalon filter 1 in the embodiment of the present invention, and the embodiments of the present invention are not described herein again.
  • the intermediate medium 1 13 of the first Etalon filter 1 1 and the intermediate medium 123 of the second Etalon filter 12 are made of materials located adjacent to the same wafer, so that The intermediate medium 1 13 of the first Etalon filter 1 1 and the intermediate medium 123 of the second Etalon filter 12 have the same thickness.
  • materials of the same wafer adjacent position may be selected as the intermediate medium 1 13 of the first Etalon filter 1 1 and The intermediate medium 123 of the second Etalon filter 12 is such that the intermediate medium 1 13 of the first Etalon filter 11 and the intermediate medium 123 of the second Etalon filter 12 are uniform in thickness, thereby ensuring the first Etalon filter 11 and The consistency of the thickness of the second Etalon filter 12.
  • the intermediate medium 1 13 of the first Etalon filter 1 1 and the intermediate medium 123 of the second Etalon filter 12 are both silicon.
  • the intermediate medium 1 13 of the first Etalon filter 1 1 and the intermediate medium 123 of the second Etalon filter 12 may be silicon, because when the optical signal is normally incident, the refractive index of silicon to different polarization states is completely Consistently, it is ensured that the first Etalon filter 1 1 and the second Etalon filter 12 are polarization-independent, so that it is not necessary to design some complicated structures to solve the polarization correlation problem, and further reduce the tunable filter 10 production cost.
  • the tunable filter provided by the present invention comprises a first Etalon filter, a second Etalon filter and a temperature controller disposed on a surface of the first Etalon filter or the second Etalon filter, wherein the first Etalon filter and the first
  • the two Etalon filters are Etalon filters sensitive to temperature changes, and the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle, while satisfying the bandwidth and isolation of the tunable filter in the field of optical fiber communication. It is required, and the optical signal is prevented from forming interference between the first Etalon filter and the second Etalon filter.
  • the wavelength tuning function can be realized, so that the tuning of the tunable filter is simple, and the tunable filter is low in cost.
  • Embodiment 2 of the present invention provides a light receiving component 20, as shown in FIG. 8, comprising: a tunable filter 10 and a light receiving module 16 as shown in FIG.
  • the tunable filter 10 is configured to perform wavelength selection on the optical signal input from the optical fiber, and transmit the selected optical signal to the optical receiving module 16.
  • the light receiving module 16 is configured to receive the optical signal obtained by the wavelength selection output by the tunable filter 10.
  • the tunable filter 10 in the embodiment of the present invention may be referred to the specific description of the corresponding content in the embodiment 1 of the present invention, and the embodiments of the present invention are not described in detail herein.
  • the light receiving component provided by the invention comprises a tunable filter and a light receiving module, the tunable filter comprising a first Etalon filter, a second Etalon filter and a first Etalon filter or a second Etalon filter a surface temperature controller, wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes, and the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle while satisfying
  • the field of optical fiber communication requires bandwidth and isolation of the tunable filter, and avoids interference of the optical signal between the first Etalon filter and the second Etalon filter.
  • the wavelength tuning function can be realized, so that the tuning of the tunable filter is simple, and the tunable filter is low in cost.
  • Embodiment 3 of the present invention provides an optical network unit 30, as shown in FIG. 9, comprising: a tunable filter 10, a light receiving module 3, a light emitting component 32, and an optical coupler 33 as shown in FIG.
  • the tunable filter 10 is configured to perform wavelength selection on the downlink optical signal, and transmit the selected downlink optical signal to the optical receiving module 3 1 ; the downstream optical signal is the optical coupler 33 is obtained by selecting an optical signal transmitted through the optical fiber.
  • the light receiving module 3 1 is configured to receive the downlink optical signal obtained by the wavelength selection output by the tunable filter 10.
  • the light emitting component 32 is configured to transmit an uplink optical signal.
  • the optical coupler 33 is configured to select an optical signal transmitted through the optical fiber to obtain the downlink optical signal, and transmit the uplink optical signal transmitted by the optical transmitting component 32 to the optical fiber.
  • the tunable filter 10 in the embodiment of the present invention may be referred to the specific description of the corresponding content in the embodiment 1 of the present invention, and the embodiments of the present invention are not described in detail herein.
  • the optical network unit provided by the invention comprises a tunable filter and a light receiving module, the tunable filter comprising a first Etalon filter, a second Etalon filter and a first Etalon filter or a second Etalon filter a surface temperature controller, wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes, and the first Etalon filter and the second Etalon filter are stacked in series at an oblique angle while satisfying
  • the field of optical fiber communication requires bandwidth and isolation of the tunable filter, and avoids interference of the optical signal between the first Etalon filter and the second Etalon filter.
  • the wavelength tuning function can be realized, so that the tuning of the tunable filter is simple, and the tunable filter is low in cost.
  • Embodiment 4 of the present invention provides an optical line terminal 40, as shown in FIG. 10, comprising: a tunable filter 10, a light receiving module 41, an optical splitter 42, a light emitting component 43, and light as shown in FIG. Coupler 44.
  • the optical coupler 44 is configured to select an optical signal transmitted through the optical fiber to obtain an uplink optical signal.
  • the optical splitter 42 is configured to perform power allocation on the uplink optical signal.
  • the tunable filter 10 is configured to perform wavelength selection on the uplink optical signal obtained by power distribution by the optical splitter 42 and transmit the selected uplink optical signal to the light receiving module 41.
  • the light receiving module 41 is configured to receive the uplink optical signal obtained by the wavelength selection output by the tunable filter 10.
  • the light emitting component 43 is configured to emit a downlink optical signal.
  • the optical coupler 44 is further configured to transmit the downstream optical signal transmitted by the light emitting component 43 to the optical fiber.
  • the optical line terminal comprises a tunable filter, a light receiving module, an optical splitter, a light emitting component and an optical coupler, the tunable filter comprising a first Etalon filter, a second Etalon filter and a setting a temperature controller on the surface of the first Etalon filter or the second Etalon filter, wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes, and the first Etalon filter and the first The two Etalon filters are stacked in series at an oblique angle, while satisfying the bandwidth and isolation requirements of the tunable filter in the field of optical fiber communication, and avoiding interference of the optical signal between the first Etalon filter and the second Etalon filter. .
  • the wavelength tuning function can be realized, so that the tuning of the tunable filter is simple, and the tunable filter is low in cost.
  • Embodiment 5 of the present invention provides a passive optical network system, as shown in FIG. 11, including: at least one optical line terminal 5, an optical distribution network 52, and a plurality of optical network units 30.
  • the optical network unit 30 includes a tunable filter 10 as shown in FIG.
  • At least one optical line terminal 51 is connected to the plurality of optical network units 30 in a point-to-multipoint manner via the optical distribution network 52.
  • the optical line terminal 41 also includes a tunable filter as described in FIG.
  • the tunable filter 10 in the embodiment of the present invention may be referred to the specific description of the corresponding content in the embodiment 1 of the present invention, and the embodiments of the present invention are not described in detail herein.
  • the passive optical network system includes: at least one optical line terminal, an optical distribution network, and a plurality of optical network units, wherein the tunable filter included in the optical network unit comprises a first Etalon filter, a second Etalon filter, and Set in the first Etalon filter a temperature controller of the surface of the wave or second Etalon filter, wherein the first Etalon filter and the second Etalon filter are both Etalon filters sensitive to temperature changes, and the first Etalon filter and the second Etalon filter Stacking in series at an oblique angle satisfies the requirements of the bandwidth and isolation of the tunable filter in the field of optical fiber communication, and avoids interference of the optical signal between the first Etalon filter and the second Etalon filter.
  • the wavelength tuning function can be realized, so that the tuning of the tunable filter is simple, and the tunable filter is low in cost.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used.
  • the combination may be integrated into another device, or some features may be ignored or not performed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as the unit may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be in the form of hardware Implementation can also be implemented in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a readable storage medium.
  • the technical solution of the present invention may be embodied in the form of a software product in the form of a software product, or a part of the technical solution, which is stored in a storage medium.
  • a number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Filters (AREA)

Abstract

La présente invention se rapporte au domaine des communications. La présente invention concerne un filtre réglable (10), un ensemble optique réglable et un système de réseau optique passif (PON) satisfaisant les exigences de la bande passante et d'isolation du filtre réglable dans le domaine des communications par fibre optique. Le filtre réglable (10) comprend un premier filtre dragon Ethernet (11), un second filtre dragon Ethernet (12) et un dispositif de régulation de température (13) disposé sur la surface du premier filtre dragon Ethernet (11) ou du second filtre dragon Ethernet (12) ; le premier filtre dragon Ethernet (11) et le second filtre dragon Ethernet (12) sont tous les deux des filtres dragon Ethernet sensibles au changement de température ; une extrémité du premier filtre dragon Ethernet (11) est connectée à une extrémité du second filtre dragon Ethernet (12) par l'intermédiaire d'un adhésif (14), et l'autre extrémité du premier filtre dragon Ethernet (11) est connectée à l'autre extrémité du second filtre dragon Ethernet (12) par l'intermédiaire d'un adhésif (15) ; et l'épaisseur de l'adhésif (14) pour connecter une extrémité du premier filtre dragon Ethernet (11) à une extrémité du second filtre dragon Ethernet (12) est supérieure à l'épaisseur de l'adhésif (15) pour connecter l'autre extrémité du premier filtre dragon Ethernet (11) à l'autre extrémité du second filtre dragon Ethernet (12).
PCT/CN2014/074452 2014-03-31 2014-03-31 Filtre réglable, ensemble optique réglable et système de réseau optique passif WO2015149249A1 (fr)

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PCT/CN2014/074452 WO2015149249A1 (fr) 2014-03-31 2014-03-31 Filtre réglable, ensemble optique réglable et système de réseau optique passif
CN201480000118.2A CN105264908B (zh) 2014-03-31 2014-03-31 一种可调滤波器、可调光组件及无源光网络系统

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CN101046553A (zh) * 2006-03-31 2007-10-03 同济大学 一种波长可调的滤波器及其应用
US20080106745A1 (en) * 2006-08-31 2008-05-08 Haber Todd C Method and apparatus for high frequency optical sensor interrogation
CN102742198A (zh) * 2012-04-06 2012-10-17 华为技术有限公司 波分复用器及无源光网络系统
CN102870037A (zh) * 2012-06-21 2013-01-09 华为技术有限公司 可调光滤波器、可调光组件和多波长无源光网络系统
CN103424899A (zh) * 2013-07-09 2013-12-04 哈尔滨工程大学 一种光子晶体光纤可调谐滤波分束器及其制作方法

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WO2011147380A2 (fr) * 2011-06-08 2011-12-01 华为技术有限公司 Emetteur optique, détecteur photonique et système de réseau optique passif

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US20030108353A1 (en) * 2001-10-09 2003-06-12 The Furukawa Electric Co., Ltd. Optical module, optical transmission apparatus, WDM optical transmission device, and method for stabilizing laser wavelength
CN101046553A (zh) * 2006-03-31 2007-10-03 同济大学 一种波长可调的滤波器及其应用
US20080106745A1 (en) * 2006-08-31 2008-05-08 Haber Todd C Method and apparatus for high frequency optical sensor interrogation
CN102742198A (zh) * 2012-04-06 2012-10-17 华为技术有限公司 波分复用器及无源光网络系统
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