CN113193918B - Apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel transmission - Google Patents
Apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel transmission Download PDFInfo
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- CN113193918B CN113193918B CN202110451821.7A CN202110451821A CN113193918B CN 113193918 B CN113193918 B CN 113193918B CN 202110451821 A CN202110451821 A CN 202110451821A CN 113193918 B CN113193918 B CN 113193918B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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Abstract
An apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel transmission, comprising: the near-end composite device, the middle composite device and the far-end composite device are connected through optical fibers; the near-end composite device and the far-end composite device mainly comprise a device for wave combination, an optical circulator and an optical filter; the intermediate compound device includes: optical coupler OC, optical circulator, optical filter. The device can couple three wavelengths with the interval of 25G to the same ITU standard 100GHz WDM channel for time frequency transmission, and can separate the three wavelengths with the interval of 25G in one standard 100GHz WDM channel. The invention couples the time frequency signal with narrower bandwidth into the same ITU standard wavelength channel for transmission, thereby effectively saving the fiber channel resource. The invention adopts commercial devices and has the advantages of simple structure, low cost, stability, reliability and the like.
Description
Technical Field
The invention relates to time comparison and frequency calibration, in particular to a device for time comparison and frequency transmission by using a single 100G wavelength channel in a single optical fiber.
Background
At present, a plurality of time comparison methods are adopted in the international time transfer link. They are not identical in terms of alignment accuracy, coverage and operating cost. The communication satellite is required to be hired as a medium for signal forwarding when the communication satellite is used for time frequency transmission, the comparison cannot be continuously carried out, and both comparison parties need to be equipped with special transmitting and receiving equipment, so that the equipment is expensive, and thus, the current laboratories with bidirectional comparison conditions are not many.
An optical fiber is a fiber made of glass or plastic and can be used as a light transmission means. The transmission principle is that the 'total reflection of light' fine optical fiber is encapsulated in a plastic sheath so that it can be bent without breaking. Generally, a Light Emitting Diode (LED) or a laser beam is used as a transmitter at one end of an optical fiber to transmit an optical pulse to one end of the optical fiber, and a photosensor is used as a receiver at the other end of the optical fiber to detect the pulse. In daily life, optical fibers are used for long distance information transmission because the loss of light transmitted through optical fibers is much lower than the loss of electricity transmitted through electric wires.
Most of the existing time-frequency transmission schemes based on optical fibers need to loop back time-frequency signals so as to eliminate the influence of link delay, and serious rayleigh scattering exists when the same wavelength is used for forward and backward transmission so that the signal-to-noise ratio is deteriorated, so that most of the optical fiber bidirectional time-frequency transmission technologies need to use a wavelength division multiplexing mode.
The ITU standard has made a strict division of the channels that can be used for optical communication, so the number of channels of a single fiber is limited. And a plurality of optical fibers are laid, so that the operation and maintenance cost is very huge. Since the bandwidth of the time-frequency signal itself is not very large, the occupation of a standard ITU 100GHz channel by a single time or frequency signal is certainly a waste of metro network channel resources.
Most wave combining/wave separating devices which divide channels more densely have the defects of high cost and the like, and a single channel of some devices is close to the characteristic frequency offset of stimulated Brillouin amplification, so that the Brillouin amplification process is randomly started and closed in the using process, and power fluctuation and waveform distortion in a transmission signal are caused.
Disclosure of Invention
The present invention is directed to solve the above-mentioned technical problems, and provides a transmission apparatus for multiplexing time and frequency transmission signals into a single 100G wavelength division multiplexing channel, D1: the device for combining the wave, the wavelength 1 is a wavelength of the central wavelength of 100G channel divided by ITU standard, the wavelength 2 and the wavelength 3 are the wavelengths which are separated from the wavelength 1 by 25G, wherein, the wavelength 2 is the smaller one, and the wavelength 3 is the larger one. The wave combiner can couple time frequency signals with the wavelength 1 and the wavelength 2 or the wavelength 1 and the wavelength 3 as the central wavelength of the carrier wave to the same ITU standard 100G channel;
the second objective of the present invention is to provide an apparatus system capable of combining time and frequency transmission signals into a single 100G wavelength division multiplexing channel and a standard data channel for joint transmission, which utilizes a standard 100G wavelength channel of a single optical fiber to realize high-precision time-frequency bidirectional transmission based on wavelength division multiplexing and data service joint transmission of a general optical network.
In order to achieve the purpose, the invention provides a device system for compounding time and frequency transfer signals into a single 100G wavelength division multiplexing channel for transmission, which comprises a near-end compounding device, an intermediate compounding device and a far-end compounding device, and the near-end compounding device and the far-end compounding device are coupled into the same optical fiber for transmission through DWDM and other standard ITU channels. The device used comprises: a wave combining device for combining the time frequency information; a four port optical circulator; an optical filter; DWDM. DWDM is a commercially available device and the other device performance is the same as that of one of the above described arrangements for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel for transmission. CWDM is a low cost WDM transmission technique oriented towards the metro network access layer. In principle, in the CWDM, optical signals with different wavelengths are multiplexed to a single optical fiber by an optical multiplexer for transmission, and at a receiving end of a link, a mixed signal in the optical fiber is decomposed into signals with different wavelengths by an optical demultiplexer.
The near-end composite device comprises a first wave combiner, a first filter and a first four-port optical circulator, wherein a second port and a third port of the first wave combiner are respectively lambda 1 、λ 2 The optical input port, the wave combining end of the first wave combiner is connected with the first port of the first four-port optical circulator, the second port and the third port of the first four-port optical circulator are both optical input ports, the input port of the first filter and the third port of the first four-port optical circulatorThe output port of the first filter is lambda 3 An optical output port; the second port of the first optical circulator is connected with one end of a first optical fiber, and the fourth port of the first four-port optical circulator is lambda 1 An optical output port;
the far-end composite device comprises a second wave combiner, a fourth wave filter and a second four-port optical circulator, wherein a second port and a third port of the second wave combiner are respectively lambda 3 、λ 1 An optical input port; the wave combining port of the second wave combiner is connected with the first port of the second four-port optical circulator, the second port of the second four-port optical circulator is connected with one end of a second optical fiber, the third port of the second four-port optical circulator is connected with the input port of the fourth filter, and the output port of the fourth filter is lambda 2 An optical output port, the fourth port of the second four-port optical circulator is lambda 1 An optical output port, an input port (b2-1) of said fourth filter being connected to a third port of said second four-port optical circulator;
the intermediate composite device comprises an optical coupler, a second filter, a third filter, a first three-port optical circulator and a second three-port optical circulator, wherein the first port of the optical coupler is connected with the second port of the first four-port optical circulator of the near-end composite device through the first optical fiber, the second port of the optical coupler is connected with the second port of the second four-port optical circulator of the far-end composite device through the second optical fiber, the third port of the optical coupler is connected with the first port of the first three-port optical circulator, and the fourth port of the optical coupler is connected with the first port of the second three-port optical circulator; the first port of the second filter is connected with the second port of the first three-port optical circulator, and the second port of the second filter is lambda 3 An optical output port; the first port of the third filter is connected with the second port of the second three-port optical circulator, and the second port of the third filter is lambda 2 An optical output port; the first port of the first three-port optical circulator is connected with the third port of the optical coupler, and the third port of the first three-port optical circulator is lambda 1 An optical output port; the third port of the second three-port optical circulator is lambda 1 And an optical output port.
The optical transmission of the first four-port optical circulator and the second four-port optical circulator is as follows:
when light enters from the first port of the first four-port optical circulator and the first port of the second four-port optical circulator respectively, the light is output from the second port of the first four-port optical circulator and the second port of the second four-port optical circulator;
when light is input from the second port, the light is output from the third port;
when light is input from the third port, light is output from the fourth port.
The light transmission of the first three-port optical circulator and the second three-port optical circulator is as follows:
if light enters from the first port, the light is output from the second port; light is input from the second port and light is output from the third port.
Compared with the prior art, the invention has the beneficial effects
The fibre channel can be divided into several channels according to the ITU standard, and information of different channels is transmitted in the optical fibre without mutual interference. The number of channels is limited and not so much bandwidth is required to convey time information and frequency information. Therefore, using multiple channels to convey time-frequency information is not conducive to proper allocation of channel resources.
If the time-frequency information is coupled to the same ITU standard channel for transmission, because the carrier wave of the time-frequency information is not ITU standard wavelength at all, a customized device is often needed, but the customized device is high in cost, complex in system and limited in use; and the channels divided by the device are too narrow, if the central wavelength is slightly shifted, the Brillouin amplification process can be randomly switched on and off, so that the signal waveform is distorted. The scheme of the patent has simple structure, adopts commercial devices, has the advantages of simple structure, low cost and the like, uses ITU standard channels, and has stable system.
Drawings
Fig. 1 is a block diagram of an apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel transmission in accordance with the present invention.
Fig. 2 is a schematic diagram of the system structure of the device for combining the time and frequency transfer signals into a single 100G wavelength division multiplexing channel and carrying out joint transmission with a standard data channel.
Fig. 3 is a schematic structural diagram of an embodiment of the apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexing channel for transmission.
Fig. 4 is a schematic structural diagram of an embodiment of the apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexing channel for joint transmission with a standard data channel according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention should not be limited thereto.
In the description of the present invention, it should be understood that the term 'near end' merely represents the end point where the time-frequency reference source is located, and does not represent a fixed end point. The wavelength 1, the wavelength 2 and the wavelength 3 are only used for describing the process of combining and splitting waves and do not represent specific wavelengths; the kind of time-frequency information of the carrier modulation of each wavelength should not be limited either.
An apparatus for combining time and frequency transfer signals into a single 100G wavelength division multiplexed channel transmission, implemented in accordance with the present invention, is described and illustrated with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a structural diagram of an apparatus for combining time and frequency transmission signals into a single 100G wdm channel for transmission according to the present invention, and it can be seen from the diagram that the apparatus for combining time and frequency transmission signals into a single 100GHz wdm channel for transmission according to the present invention includes a near-end combining apparatus, a middle combining apparatus, and a far-end combining apparatus, and the three combining apparatuses are connected by an optical fiber for transmitting time and frequency signals:
the near-end composite device comprises a first wave combiner a1. A first filter a2 and a first four-port optical circulator a3, the second port a1-2 and the third port a1-3 of the first multiplexer a1 are lambda respectively 1 、λ 2 An optical input port, a wave-combining end a1-com of a first wave combiner a1 is connected with a first port a3-1 of the first four-port optical circulator a3, a second port a3-2 and a third port a3-3 of the first four-port optical circulator a3 are both optical input ports, an input port a2-1 of a first filter a2 is connected with a third port a3-3 of the first four-port optical circulator a3, and an output port a2-2 of the first filter a2 is λ 3 An optical output port; the second port a3-2 of the first optical circulator a3 is connected with one end of a first optical fiber for transmitting time frequency signals, the third port a3-3 of the first four-port optical circulator a3 is connected with the input port a2-1 of the first filter a2, and the output port a2-2 of the first filter a2 is lambda 3 The fourth port a3-4 of the first four-port optical circulator a3 is lambda 1 An optical output port;
the far-end composite device comprises a second wave combiner b1, a fourth wave filter b2 and a second four-port optical circulator b3, wherein a second port b1-2 and a third port b1-3 of the second wave combiner b1 are respectively lambda 3 、λ 1 An optical input port; a wave-combining port b1-com of the second wave combiner b1 is connected with a first port b3-1 of the second four-port optical circulator b3, a second port b3-2 of the second four-port optical circulator b3 is connected with one end of an optical fiber for second transmission time frequency signals, a third port b3-3 of the second four-port optical circulator b3 is connected with an input port b2-1 of the fourth filter b2, and an output port a2-2 of the fourth filter b2 is lambda 2 An optical output port, the fourth port a3-4 of the second four-port optical circulator b3 is lambda 1 An optical output port;
the intermediate composite device comprises an optical coupler OC, a second filter c2, a third filter c3, a first three-port optical circulator c4 and a second three-port optical circulator c5, wherein the first port c1-1 of the optical coupler OC is connected with the connection near-end through the first optical fiber for transmitting time frequency signalsA second port a3-2 of a first four-port optical circulator a3 of the hybrid device is connected, a second port c1-2 of the optical coupler OC is connected with a second port b3-2 of a second four-port optical circulator b3 of the remote hybrid device through the optical fiber of the second transmission time frequency signal, a third port c1-3 of the optical coupler OC is connected with a first port c4-1 of the first three-port optical circulator c4, and a fourth port c1-4 of the optical coupler OC is connected with a first port c5-1 of the second three-port optical circulator c 5; the first port c2-1 of the second filter c2 is connected with the second port c4-2 of the first three-port optical circulator c4, and the second port c2-2 of the second filter c2 is lambda 3 An optical output port; the first port c3-1 of the third filter c3 is connected with the second port c5-2 of the second three-port optical circulator c5, and the second port c3-2 of the third filter c3 is lambda 2 An optical output port; the first port c4-1 of the first three-port optical circulator c4 is connected with the third port c1-3 of the optical coupler OC, the second port c4-2 of the first three-port optical circulator c4 is connected with the first port c2-1 of the second filter c2, and the third port c4-3 of the first three-port optical circulator c4 is lambda 1 An optical output port; a first port c5-1 of the second three-port optical circulator c5 is connected with a fourth port c1-4 of the optical coupler OC, a second port c5-2 of the second three-port optical circulator c5 is connected with a first port c3-1 of the third filter c3, and a third port c5-3 of the second three-port optical circulator c5 is lambda 1 And an optical output port.
The optical transmission behavior of the first four-port optical circulator a3 and the second four-port optical circulator b3 is as follows:
if light enters from the first port a3-1, b3-1, the light is output from the second port a3-2, b 3-2; light is input from the second ports a3-2 and b3-2, and then light is output from the third ports a3-3 and b 3-3; light is input from the third ports a3-3, b3-3, and light is output from the fourth ports a3-4, b 3-4.
The light transmission behaviors of the first three-port optical circulator c4 and the second three-port optical circulator c5 are as follows:
if light enters from the first ports c4-1, c5-1, the light is output from the second ports c4-2, c 5-2; light is input from the second ports c4-2, c5-2, and light is output from the third ports c4-3, c 5-3.
One effective scheme for the first filter a2 and the fourth filter b2 is: the reflection center wavelengths of the two filters are both the center wavelength lambda 1 of an ITU standard 100GHz channel, and the 30dB bandwidth of the reflection spectrum is more than 10GHz and less than 25 GHz;
the other effective scheme is as follows: the reflection center wavelength of the first filter a2 is the wavelength lambda 2, the 30dB bandwidth of the reflection spectrum is more than 25GHz and less than 40GHz, the reflection center wavelength of the fourth filter b2 is the wavelength lambda 3, and the 30dB bandwidth of the reflection spectrum is more than 25GHz and less than 40 GHz.
The first combiner a1 combines optical signals with a wavelength λ 1 and a wavelength λ 2 to a combiner end a1-com, the wavelength λ 1 is a certain central wavelength of an ITU standard 100GHz channel, the distance between the wavelength λ 2 and the wavelength λ 1 is 25GHz and is different from the wavelength λ 3, the 3dB bandwidth of a port corresponding to the wavelength λ 1 in the first combiner a1 should not be less than 15GHz, and the 3dB bandwidth of a port corresponding to the wavelength λ 2 should not be less than 65 GHz.
The second combiner b1 combines the optical signals with the wavelength λ 1 and the wavelength λ 3 to the combiner end b1-com, the interval between the wavelength λ 3 and the wavelength λ 1 is 25GHz and is different from the wavelength λ 2, the 3dB bandwidth of the port corresponding to the wavelength λ 1 in the second combiner b1 should not be less than 15GHz, and the 3dB bandwidth of the port corresponding to the wavelength λ 3 should not be less than 65 GHz.
The second filter c2 of the intermediate composite device has the same performance as the first filter (a2), and the third filter c3 has the same performance as the fourth filter b 2. The single ITU standard 100GHz channel may be located in the S-band, C-band, L-band, or future available optical communication bands for optical communications.
The time signal and the frequency signal at the near end are subjected to photoelectric conversion, then the time information is carried by the optical carrier wave with the wavelength 1, the frequency information is carried by the wavelength 2, and the time signal and the frequency signal are coupled to the same single 100G wavelength channel through the wave combiner and transmitted in the same optical fiber.
After the signal reaches the far end, the information of the time-frequency channel enters the filter at the far end through the circulator, and since the fourth optical filter b2 adopts a filtering mode of passing a specific wavelength and reflecting the specific wavelength, the wavelength 2 passes through the fourth optical filter b2, and the wavelength 1 is reflected back to the second optical circulator b3 and is output from the fourth port b3-4 of the second optical circulator b 3. Thereby realizing the wave-splitting process.
Because time frequency transmission mostly needs bidirectional transmission, the wave combining from the far end to the near end and the wave splitting process are the same as those from the near end to the far end, and therefore, the description is omitted.
When the signal reaches the intermediate node, the information of the time-frequency channel is subjected to light splitting downloading through the OC, and the information which is not downloaded is continuously transmitted; the downloaded information passes through an optical filter, and can separate the time-frequency information with the wavelength 1 as the carrier from the time-frequency information with the wavelength 2 as the carrier or the time-frequency information with the wavelength 1 as the carrier from the time-frequency information with the wavelength 3 as the carrier.
When the time-frequency information needs to be transmitted jointly with the data information, the time-frequency information is combined to the same ITU standard 100G channel through the near-end combining device, is combined with the data channel through a DWDM (dense wavelength division multiplexing) device, and is coupled to the same optical fiber for transmission, as shown in fig. 2; the intermediate node is demultiplexed with a data channel through DWDM, and after being downloaded by an intermediate composite device, the intermediate node and data information are composited to the same optical fiber through DWDM for transmission; after the signal reaches the far end, the data channel and the time frequency channel are separated through DWDM, the wave division is carried out through a far end composite device, the local time frequency information is compounded to the same ITU standard 100G channel, the wave combination is carried out through DWDM and the data channel, and the wave combination is coupled to the same optical fiber for transmission.
The wave combiner shown in fig. 3 adopts WDM, and the central wavelengths of two channels of WDM1 (wave combiner 1) are 1549.72nm and 1550.12nm respectively; the center wavelengths of the two channels of WDM2 were 1550.12nm 1550.52nm, respectively, and the 3dB bandwidth of each channel was the common bandwidth of commercial 100G DWDM (about 65G Hz). The filter uses a filter FBG with a central wavelength of 1550.12nm and a 30dB bandwidth of 25 ghz.
Fig. 4 is a schematic structural diagram of an embodiment of the apparatus for combining time and frequency transmission signals into a single 100G wavelength division multiplexing channel for transmission according to the present invention, and the adopted time transmission mode is time division multiplexing, so that only one wavelength is required to complete bidirectional transmission of time information. The optical wavelength carrying the time signal is 1550.12nm, and the optical wavelength carrying the frequency signal is 1550.32nm and 1549.92 nm.
Claims (8)
1. An apparatus for combining time and frequency transfer signals into a single 100GHz wavelength division multiplexed channel transmission, comprising: through a near-end composite device, a middle composite device and a far-end composite device which are connected by optical fibers, 3 paths of optical carriers carrying time and frequency transmission signals are compounded to a single ITU standard 100GHz channel for transmission through DWDM;
the near-end composite device comprises a first wave combiner (a1), a first filter (a2) and a first four-port optical circulator (a3), wherein the second port (a1-2) and the third port (a1-3) of the first wave combiner (a1) are respectively lambda 1 、λ 2 An optical input port, a wave combining end (a1-com) of a first wave combiner (a1) is connected with a first port (a3-1) of the first four-port optical circulator (a3), the first port (a3-1) and a second port (a3-2) of the first four-port optical circulator (a3) are both optical input ports, an input port (a2-1) of the first filter (a2) is connected with a third port (a3-3) of the first four-port optical circulator (a3), and an output port (a2-2) of the first filter (a2) is lambda 3 An optical output port; the second port (a3-2) of the first four-port optical circulator (a3) is connected with one end of a first optical fiber, and the fourth port (a3-4) of the first four-port optical circulator (a3) is lambda 1 An optical output port;
the far-end composite device comprises a second wave combiner (b1), a fourth filter (b2) and a second four-port optical circulator (b3), wherein a second port (b1-2) and a third port (b1-3) of the second wave combiner (b1) are respectively lambda 3 、λ 1 An optical input port; the wave-combining port (b1-com) of the second wave-combiner (b1) is connected with the first port (b3-1) of the second four-port optical circulator (b3), and the second port is connected with the second port of the second wave-combiner (b1)The second port (b3-2) of the two-four-port optical circulator (b3) is connected with one end of a second optical fiber, the third port (b3-3) of the second four-port optical circulator (b3) is connected with the input port (b2-1) of the fourth filter (b2), and the output port (b2-2) of the fourth filter (b2) is lambda 2 An optical output port, the fourth port (b3-4) of the second four-port optical circulator (b3) is lambda 1 An optical output port, the input port (b2-1) of said fourth filter (b2) being connected to the third port (b3-3) of said second four-port optical circulator (b 3);
the intermediate composite device comprises an Optical Coupler (OC), a second filter (c2), a third filter (c3), a first three-port optical circulator (c4) and a second three-port optical circulator (c5), wherein the first port (c1-1) of the Optical Coupler (OC) is connected with the second port (a3-2) of the first four-port optical circulator (a3) connected with the near-end composite device through the first optical fiber, the second port (c1-2) of the Optical Coupler (OC) is connected with the second port (b3-2) of the second four-port optical circulator (b3) connected with the far-end composite device through the second optical fiber, the third port (c1-3) of the Optical Coupler (OC) is connected with the first port (c3-1) of the first three-port optical circulator (c4), and the fourth port (c 384-7374) of the Optical Coupler (OC) is connected with the second optical ring 7374) of the first three-port The first port (c5-1) of the former (c5) is connected; the first port (c2-1) of the second filter (c2) is connected with the second port (c4-2) of the first three-port optical circulator (c4), and the second port (c2-2) of the second filter (c2) is lambda 3 An optical output port; the first port (c3-1) of the third filter (c3) is connected with the second port (c5-2) of the second three-port optical circulator (c5), and the second port (c3-2) of the third filter (c3) is lambda 2 An optical output port; the first port (c4-1) of the first three-port optical circulator (c4) is connected with the third port (c1-3) of the Optical Coupler (OC), and the third port (c4-3) of the first three-port optical circulator (c4) is lambda 1 An optical output port; the third port (c5-3) of the second three-port optical circulator (c5) is lambda 1 And an optical output port.
2. The apparatus for multiplexing time and frequency signals onto a single 100GHz wdm channel transmission according to claim 1, wherein the optical transmissions of the first four-port optical circulator (a3) and the second four-port optical circulator (b3) are as follows:
when light enters from the first port (a3-1) of the first four-port optical circulator (a3) and the first port (b3-1) of the second four-port optical circulator (b3), the light is output from the second port (a3-2) of the first four-port optical circulator (a3) and the second port (b3-2) of the second four-port optical circulator (b 3);
when light is input from the second port (a3-2, b3-2), the light is output from the third port (a3-3, b 3-3);
when light is input from the third port (a3-3, b3-3), the light is output from the fourth port (a3-4, b 3-4).
3. The apparatus for multiplexing time and frequency signals onto a single 100GHz wdm channel for transmission according to claim 1, wherein the optical transmissions of the first three-port optical circulator (c4) and the second three-port optical circulator (c5) are as follows:
if light enters from the first port (c4-1, c5-1), the light is output from the second port (c4-2, c 5-2); light is input from the second port (c4-2, c5-2), and light is output from the third port (c4-3, c 5-3).
4. The apparatus for multiplexing time and frequency transfer signals to a single 100GHz wdm channel for transmission according to claim 1, wherein the first filter (a2) and the second filter (b2) each have a reflection center wavelength λ 1 of an ITU standard 100GHz channel, and a 30dB bandwidth of the reflection spectrum is greater than 10GHz and less than 25 GHz;
alternatively, the first filter (a2) has a reflection center wavelength λ 2 and a reflection spectrum 30dB bandwidth of greater than 25GHz and less than 40GHz, and the second filter (b2) has a reflection center wavelength λ 3 and a reflection spectrum 30dB bandwidth of greater than 25GHz and less than 40 GHz.
5. The apparatus for multiplexing time and frequency transfer signals into a single 100GHz wdm channel for transmission according to claim 1, wherein the first combiner (a1) in the near-end multiplexer apparatus multiplexes the optical signals with the wavelengths λ 1 and λ 2 into a combined wave end (a1-com), the wavelength λ 1 is a certain center wavelength of the ITU standard 100GHz channel, the distance between the wavelength λ 2 and the wavelength λ 1 is 25GHz different from the wavelength λ 3, the 3dB bandwidth of the port corresponding to the wavelength λ 1 in the first combiner (a1) is not less than 15GHz, and the 3dB bandwidth of the port corresponding to the wavelength λ 2 is not less than 65 GHz.
6. The apparatus for multiplexing time and frequency transfer signals into a single 100GHz wdm channel for transmission according to claim 1, wherein the second combiner (b1) combines optical signals having a wavelength λ 1 and a wavelength λ 3 into a combined wave terminal (b1-com), the wavelength λ 3 is separated from the wavelength λ 1 by 25GHz and is different from the wavelength λ 2, the 3dB bandwidth of the port corresponding to the wavelength λ 1 in the second combiner is not less than 15GHz, and the 3dB bandwidth of the port corresponding to the wavelength λ 3 is not less than 65 GHz.
7. The apparatus for multiplexing time and frequency transfer signals to a single 100GHz wdm channel for transmission according to claim 1, wherein the second filter (c2) has the same performance as the first filter (a2), and the third filter (c3) has the same performance as the fourth filter (b 2).
8. The apparatus of claim 1, wherein the single ITU standard 100GHz channel is located in the S-band, C-band, L-band of optical communications.
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