WO2018035767A1 - 一种分段式微环谐振腔级联装置 - Google Patents

一种分段式微环谐振腔级联装置 Download PDF

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Publication number
WO2018035767A1
WO2018035767A1 PCT/CN2016/096597 CN2016096597W WO2018035767A1 WO 2018035767 A1 WO2018035767 A1 WO 2018035767A1 CN 2016096597 W CN2016096597 W CN 2016096597W WO 2018035767 A1 WO2018035767 A1 WO 2018035767A1
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micro
port
ring resonator
resonator
segment
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PCT/CN2016/096597
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English (en)
French (fr)
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王涛
刘宁
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华为技术有限公司
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Priority to CN201680082974.6A priority Critical patent/CN108702235B/zh
Priority to PCT/CN2016/096597 priority patent/WO2018035767A1/zh
Publication of WO2018035767A1 publication Critical patent/WO2018035767A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • Embodiments of the present invention relate to the field of optical communication technologies, and in particular, to a segmented micro-ring resonator cascade device.
  • the data center business volume continues to increase, its scale continues to grow.
  • the internal interconnection distance of the data center reaches 2km, and the transmission distance between data centers reaches 100km, and the data rate of a single optical interface can reach Tbit/s.
  • the data center architecture is transformed from a traditional three-tier North-South interconnect to an east-west interconnect based on a ridge structure. This new interconnect architecture addresses the following requirements: 1) greater optical interconnect interface traffic; 2) lower optical module power consumption, size and cost; and 3) lower network latency.
  • a comb module laser + a microring resonator series optical module has been proposed.
  • the architecture utilizes a single laser to output multi-wavelength characteristics, as well as the unique dual-split, modulation dual-function of the micro-ring, with a Scalability of Gbps to Tbps, and reduces power consumption, size and cost of the optical module.
  • the broadband comb spectrum source has a plurality of carriers, and the wavelength of each carrier is in one-to-one correspondence with the microrings in the microring resonator string.
  • each micro-ring modulator cascaded at the transmitting end performs modulation on one of the carriers, and an automatic multiplex (Mux) is transmitted through the optical fiber to the receiving end.
  • Mcux automatic multiplex
  • each carrier is demultiplexed by a corresponding one of the micro-rings (Demux).
  • the resonant wavelength of the microring resonator has a periodicity, and the interval between each adjacent two resonant wavelengths is called the Free Spectral Range (FSR), and the size of the FSR is inversely proportional to the diameter of the microring.
  • FSR Free Spectral Range
  • the diameter of the microring cannot be too small, usually a dozen micrometers, and the corresponding FSR is about 10 nm.
  • the bandwidth of the wideband comb spectrum is larger than the FSR, the carrier exceeding the FSR will be modulated with the same data by the adjacent resonant wavelength of the same microring, resulting in wasted carrier resources.
  • the width of the sub-band is the same as that of the micro-ring FSR, and the six resonant wavelengths in the sub-band 1 are from six micro-rings, and the six resonant wavelengths in the sub-band 2 are from the same six micro-rings. . Therefore, when the dressing spectrum source has 12 carriers At the time of inception, the data modulated on the six carriers of the sub-band 1 and the data modulated on the six carriers of the sub-band 2 will be identical, wasting half of the carrier resources.
  • the embodiment of the invention provides a segmented micro-ring resonant cavity cascading device, which is used to solve the problem that when the bandwidth of the dressing spectrum is larger than the micro-ring FSR, the carrier resources exceeding the FSR are wasted.
  • a segmented micro-ring resonator cascade device comprising: an L-segment micro-ring resonator cascade device, wherein each segment of the micro-ring resonator cascade device comprises a filter module and a micro-ring resonator The first port of the filter module is connected to the input end of the microring resonator group;
  • the second port of the filter module in the K-segment micro-ring resonator cascade device in the L-segment micro-ring resonator cascade device is connected to the third port of the filter module in the K-1 segment micro-ring resonator cascade device
  • the output end of the micro-ring resonator group in the K-th micro-ring resonator cascade device is connected to the fourth port of the filter module in the K-1 segment micro-ring resonator cascade device;
  • the output end of the micro-ring resonator group in the cavity cascading device is an output end of the segmented micro-ring resonator cascading device, and is used for outputting the multiplexed wave of each sub-wave band; the first-stage micro-ring resonator cascading device
  • the second port of the filtering module is connected to the grooming spectrum light source;
  • the filtering module in the K-th micro-resonator cascading device is configured to select the K-th micro-ring resonator cascade when the carrier wave emitted by the grooming spectrum source passes through the K-th micro-resonator cascading device.
  • the sub-band corresponding to the device is modulated by the first port of the filtering module in the K-th micro-ring resonator cascade device to the input end of the micro-ring resonator group in the K-th micro-resonator cascade device.
  • the width of the sub-band corresponding to the K-th micro-resonator cascading device is less than or equal to the free spectral range of any micro-ring resonator in the micro-ring resonator group of the K-th micro-resonator cascading device,
  • Each sub-ring resonator cascade device has a different sub-band, and the sub-bands corresponding to each segment of the micro-ring resonator cascade device cover the bandwidth of the carrier wave emitted by the vanishing spectrum source, and L is a positive integer greater than 2.
  • K is a positive integer greater than 1
  • L is greater than or equal to K.
  • Modulation and merging by the above-mentioned segmented micro-ring resonator cascading device can ensure that each carrier in the sub-band can be effectively modulated by the micro-ring resonator in the segment, and the bandwidth of the dressing spectrum source is greater than
  • the free spectral range of the microring resonator is a problem of wasted carrier resources beyond the free spectral range.
  • the filtering module is a grating-assisted directional coupler.
  • the sub-bands corresponding to each micro-ring resonator cascade device can be quickly selected.
  • the filtering module includes a grating, a first circulator, and a second circulator;
  • the grating includes a first port, a second port, and a third port
  • the second circulator includes a first port, a second port, and a third port
  • a first port of the grating is connected to the third port of the filter module, and a second port of the grating is connected to the second port of the first circulator;
  • the first port of the first circulator is connected to the third port of the second circulator, and the third port of the first circulator is connected to the first port of the filter module;
  • the first port of the second circulator is connected to the fourth port of the filter module, and the second port of the second circulator is connected to the second port of the filter module.
  • the sub-bands corresponding to each micro-ring resonator cascade device can be quickly selected.
  • the third port and the fourth port of the filtering module in the microring resonator cascade device are connected with light absorbing means for absorbing the remaining optical carriers.
  • the microring resonator group is composed of M microring resonators in series, wherein M is less than or equal to the number of microring resonance peaks accommodated in the free spectral range of the microring resonator group.
  • the microring resonance is used as an electro-optic modulator.
  • a segmented micro-ring resonator cascade device comprising an L-segment micro-ring resonator cascade device, wherein each segment of the micro-ring resonator cascade device comprises a filter module and a micro-ring resonator group, The first port of the filter module is connected to the input end of the microring resonator group;
  • the second port of the filter module in the K-segment micro-ring resonator cascade device in the L-segment micro-ring resonator cascade device is connected to the third port of the filter module in the K-1 segment micro-ring resonator cascade device a second port of the filter module in the first stage micro-ring resonator cascade device is connected to the optical fiber;
  • the filtering module in the K-th micro-resonator cascading device selects the sub-band corresponding to the K-th micro-resonator cascading device
  • the first port of the filtering module in the K-th micro-ring resonator cascade device is input to the input end of the micro-ring resonator group in the K-th micro-ring resonator cascade device for filtering and outputting;
  • the width of the sub-band corresponding to the K-th micro-resonator cascading device is less than or equal to the free spectral range of any micro-ring resonator in the micro-ring resonator group corresponding to the K-th micro-resonator cascading device,
  • Each sub-ring resonator cascade device has a different sub-band, and the sub-bands corresponding to each segment of the micro-ring resonator cascade device cover the bandwidth of the carrier transmitted by the fiber, and L and K are positive integers greater than 0.
  • L is greater than or equal to K.
  • each carrier in the wavelet band can be effectively filtered by the micro-ring resonator in the segment, which solves the problem that when the bandwidth of the dressing spectrum light source is larger than
  • the free spectral range of the microring resonator is a problem of wasted carrier resources beyond the free spectral range.
  • the filtering module is a grating-assisted directional coupler.
  • the sub-bands corresponding to each micro-ring resonator cascade device can be quickly selected.
  • the filtering module includes a grating, a first circulator, and a second circulator;
  • the grating includes a first port, a second port, and a third port
  • the second circulator includes a first port, a second port, and a third port
  • a first port of the grating is connected to the third port of the filter module, and a second port of the grating is connected to the second port of the first circulator;
  • the first port of the first circulator is connected to the third port of the second circulator, and the third port of the first circulator is connected to the first port of the filter module;
  • the first port of the second circulator is connected to the fourth port of the filter module, and the second port of the second circulator is connected to the second port of the filter module.
  • the sub-bands corresponding to each micro-ring resonator cascade device can be quickly selected.
  • each microring resonator in the microring resonator group in the microring resonator cascade device is the output end of the microring resonator group, and is used for outputting the carrier filtered by each microring resonator.
  • the micro ring resonance The cavity group is composed of M microring resonators, wherein the input end of the first microring resonator is the input end of the microring resonator group, the input end of the jth microring resonator and the j-1th micro
  • M is less than or equal to the number of microring resonance peaks accommodated in the free spectral range of the microring resonator group
  • j is a positive integer greater than 1
  • M is greater than or equal to j.
  • the microring resonator is used as a tunable filter.
  • the segmented micro-ring resonant cavity cascading device comprises an L-segment micro-ring resonant cavity cascading device, wherein each micro-ring resonant cavity cascading device comprises a filtering module and a micro-ring resonant cavity group, and filtering
  • the first port of the module is connected to the input end of the micro-ring resonator group, and the second port of the filter module in the K-segment micro-ring resonator cascade device and the filter in the K-1 segment micro-ring resonator cascade device
  • the third port of the module is connected, and the output end of the micro-ring resonator group in the K-segment micro-ring resonator cascade device is connected to the fourth port of the filter module in the K-1 segment micro-ring resonator cascade device, wherein, when the carrier wave emitted by the grooming spectrum source passes through the K-th micro-ring resonator cascade device, the filter module in
  • Modulation and merging by the above-mentioned segmented micro-ring resonator cascading device can ensure that each carrier in the sub-band can be effectively modulated by the micro-ring resonator in the segment, and the bandwidth of the dressing spectrum source is greater than
  • the free spectral range of the microring resonator is a problem of wasted carrier resources beyond the free spectral range.
  • FIG. 1 is a schematic diagram of a micro-ring resonator cascading device provided in the prior art
  • FIG. 2 is a schematic diagram of a carrier modulation provided in the prior art
  • FIG. 3 is a schematic diagram of a system architecture according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of a segmented micro-ring resonator cascade device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a K-th micro-resonator cascading device according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of an apparatus for providing a GADC according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a K-th micro-resonator cascading device provided in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a segmented micro-ring resonator cascade device according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a filtering module according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a segmented micro-ring resonator cascade device according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a K-th micro-ring resonant cavity cascading device according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a device for a microring resonant cavity according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of an apparatus for a micro-ring resonator group according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a K-th micro-ring resonator cascade device according to an embodiment of the present invention.
  • FIG. 15 is a schematic diagram of a segmented micro-ring resonator cascade device according to an embodiment of the present invention.
  • FIG. 16 is a schematic diagram of a filtering module according to an embodiment of the present invention.
  • FIG. 3 shows a system architecture provided by an embodiment of the present invention.
  • the system architecture includes a laser 301, a transmitter 302, and a receiver 303.
  • the laser is connected to the transmitter through an optical fiber for providing a light source for the transmitter, and the transmitter is connected to the receiver through the optical fiber, and each micro-ring resonator cascaded in the transmitter completes modulation on one of the carriers, and then automatically multiplexes
  • the optical fiber is sent to the receiver, and the receiver further splits the wave through the corresponding micro-ring resonator and inputs it to the PD for photoelectric conversion.
  • the segmented micro-ring resonator cascading device provided by the embodiment of the present invention is located at the above-mentioned transmitter or receiver.
  • FIG. 4 shows a segmented micro-ring resonator cascading device according to an embodiment of the present invention.
  • the cascading device can be located at the transmitting end.
  • the cascading device specifically includes:
  • each segment of the micro-ring resonator cascading device comprises a filtering module 401 and a micro-ring resonator group 402, the first port of the filtering module 401 and the micro-ring resonator group 402 The input is connected.
  • the second port of the filtering module 401 in the K-th segment micro-ring resonator cascading device is cascaded with the K-th segment micro-ring resonator.
  • the third port of the filtering module 401 in the device is connected, the output end of the microring resonator group 402 in the Kth segment microring resonator cascade device and the filtering module in the K-1 segment microring resonator cascade device
  • the fourth port of 401 is connected, and the first port of the filtering module 401 of the Kth segment is connected to the input end of the microring resonator group 402 of the Kth segment, wherein L is a positive integer greater than 0, and K is a positive greater than 1. Integer, L is greater than or equal to K.
  • the filtering module 401 in the K-th micro-ring resonator cascading device selects the K-th segment micro-ring resonator
  • the cascode device corresponds to the sub-band, and is input to the micro-ring resonator group 402 in the K-th micro-resonator cascading device via the first port of the filtering module 401 in the K-th micro-ring resonator cascading device. The input is modulated and combined.
  • the second port of the filtering module 401 in the first-stage micro-ring resonator cascading device is connected to the grooming spectrum light source, and the grooming spectrum light source emits N carriers, and the N carriers are divided into L
  • the micro-ring resonator strings are divided into L micro-ring resonator groups 402, and each group of micro-ring resonators corresponds to one sub-band.
  • the L sub-bands emitted by the grooming spectrum source enter the segmented micro-ring resonator cascade device through the second port of the filtering module 401 in the first-stage micro-ring resonator cascade device, and the L sub-bands After passing through the filtering module 401 of the first segment, the first subcarrier is selected, and the first subband passes through the first port of the filtering module 401 of the first segment to enter the microring resonator of the first segment.
  • the width of the sub-band is less than or equal to the free spectral range of any micro-ring resonator in the micro-ring resonator group 402, and the sub-wave band corresponding to each micro-ring resonator cascade device is different.
  • the sub-bands corresponding to the ring resonator cascade device combine to cover the bandwidth of the carrier emitted by the vanishing spectrum source.
  • Modulation and merging by the above-mentioned segmented micro-ring resonator cascading device can ensure that each carrier in the sub-band can be effectively modulated by the micro-ring resonator in the segment, and the bandwidth of the dressing spectrum source is greater than The free spectral range of the microring resonator, beyond the free spectral range of the carrier The source is wasted.
  • the micro-ring resonator group 402 is composed of M micro-ring resonators in series. As shown in FIG. 5, the M micro-ring resonators in FIG. 5 are connected in series, and the input end of the first micro-ring resonator and the filtering module 401 The first port is connected, the output end of the first microring resonator is connected to the input end of the second microring resonator, the output end of the second microring resonator and the input end of the third microring resonator The connection, and so on, the output of the Mth microring resonator is connected to the fourth port of the filter module 401. Where M is less than or equal to the number of microring resonance peaks accommodated in the free spectral range of the microring resonator group 402.
  • the output end of the micro-ring resonator group 402 in the first-stage micro-ring resonator cascade device is segmented in the embodiment of the present invention.
  • the output of the micro-ring resonator cascade device That is, after the first sub-band passes through the first port of the filtering module 401 of the first segment and enters the micro-ring resonator group 402 of the first segment to perform adjustment and merging, the merging wave passes through the first
  • the output of the microring resonator group 402 in the segment microring resonator cascade device is output.
  • the output ends of the micro-ring resonator group 402 in the subsequent micro-ring resonator cascade device of the second segment and the third segment up to the L-th segment are respectively transmitted to the micro-ring resonator cascade device of the previous segment thereof.
  • the third port and the fourth port of the filtering module 401 in the L-th micro-ring resonator cascade device are connected with light absorbing means for absorbing the remaining optical carriers to avoid reflection noise.
  • the filtering module 401 may be a GADC (Grating Assisted Directional Coupler).
  • the GADC is a Bragg grating device having two waveguides, including a first port, a second port, a third port, and a fourth port, and the first port of the GADC is a Drop port.
  • the second port is an Input port
  • the third port is a Through port
  • the fourth port is an Add port.
  • the first port of the GADC of the Kth segment is connected to the input end of the K-segment micro-ring resonator group 402, and the second port of the K-segment GADC is connected to the third of the K-segment GADC.
  • the output of the micro-ring resonator group 402 of the K-th segment is connected to the fourth port of the GADC of the K-1 segment, and so on.
  • the Drop port of the GADC of the Kth segment is connected to the input terminal of the microring resonator group 402 of the Kth segment, and the input port of the GADC of the Kth segment is connected to the Through port of the GADC of the K-1 segment, the Kth segment
  • the output of the microring resonator group 402 is connected to the Add port of the GADC of the K-1 segment.
  • 8 is a segmented microring resonator cascade device using GADC instead of filter module 401.
  • different GADCs correspond to different sub-bands, and the sub-bands corresponding to each GADC are waved at the Drop port and blocked at the Through port.
  • the Drop end filters out the wavelet band 1 (including the carriers 1 to M), and inputs them to the microring resonator group 4021 to M to modulate and combine the waves.
  • the width of the wavelet band matches the free spectral range of the microring resonator.
  • the remaining carriers continue to pass from the Through end to the GADC-2, and the Drop side filters out the subband 2 (including the carrier M+1 ⁇ 2M), and inputs it to the next microring resonator group 4021 ⁇ M for modulation and access to the GADC-
  • the Add port of 1 completes the merging.
  • the input end of the microring resonator group 402 is connected to the Drop terminal of the GADC K, and the output terminal is connected to the Add terminal of the upper stage GADC K-1.
  • the input port of GADC K is connected to the Through end of the previous GADC K-1.
  • the subband K is output from the Through end of the upper stage GADC K-1 and enters the input port of GADC K.
  • the M carriers in the wavelet band K are waved at the Drop end and input into the corresponding M microring resonators to respectively modulate and combine the waves, and then output from the Add port of the GADC K-1.
  • the modulated carrier in the wavelet band K is directly output from the output end of the final first-stage micro-ring resonator group 402, and is not re-modulated by the micro-ring resonators of other sub-segments, nor Will be blocked by other GADC.
  • the filtering module 401 may include a grating, a first circulator, and a second circulator. As shown in FIG. 9, the grating includes a first port and a second port, the first circulator includes a first port, a second port, and a third port, and the second circulator includes the first Port, second port, third port.
  • the first port of the grating is the third port of the filtering module 401
  • the second port of the grating is connected to the second port of the first circulator
  • the first port of the first circulator and the second circulator a third port is connected
  • a third port of the first circulator is a first port of the filtering module 401
  • a first port of the second circulator is a fourth port of the filtering module 401
  • the second port is the second port of the filtering module 401.
  • the filter module 401 is replaced by a grating and two circulators.
  • Each subsection of the segmented microring resonator cascade is comprised of a grating, two circulators, and a microring resonator set 402.
  • the filter module 401 includes two three-port circulators, namely a circulator a and a circulator b.
  • the circulator a includes three ports of one port, two ports, and three ports
  • the circulator b includes one port, two ports, and three ports. Three ports, such as ports.
  • the input of the microring resonator group 402 is connected to the port 3 of the circulator a, and the output of the microring resonator group 402 is connected to the port 1 of the circulator b.
  • the port 1 of the circulator a is connected to the port 3 of the circulator b.
  • the sub-band K enters the port 1 of the circulator a of the K-stage from the 3rd end of the circulator b of the micro-ring resonator cascading device of the upper stage, and enters the 2 port of the circulator a of the K-stage
  • the grating K completes the filtering of the M carriers in the wavelet band K, and after the reflection, the 3-port down-wave of the circulator a of the K-th segment is input to the micro-ring resonator group 402, and the modulation and sum-wave are sequentially completed, and the access is performed.
  • the circulator and grating can be fiber-based devices or monolithically integrated with cascaded microring resonators.
  • the microring resonator in the microring resonator set 402 in each segment can be used as an electro-optic modulator through which the carrier can be modulated.
  • the segmented micro-ring resonant cavity cascading device comprises an L-segment micro-ring resonant cavity cascading device, wherein each micro-ring resonant cavity cascading device comprises a filtering module and a micro-ring resonant cavity group, and filtering
  • the first port of the module is connected to the input end of the micro-ring resonator group, and the second port of the filter module in the K-segment micro-ring resonator cascade device and the filter in the K-1 segment micro-ring resonator cascade device
  • the third port of the module is connected, and the output end of the micro-ring resonator group in the K-segment micro-ring resonator cascade device is connected to the fourth port of the filter module in the K-1 segment micro-ring resonator cascade device, Its Wherein, when the carrier wave emitted by the grooming spectrum source passes through the K-th micro-ring resonator cascade device, the filter
  • Modulation and merging by the above-mentioned segmented micro-ring resonator cascading device can ensure that each carrier in the sub-band can be effectively modulated by the micro-ring resonator in the segment, and the bandwidth of the dressing spectrum source is greater than
  • the free spectral range of the microring resonator is a problem of wasted carrier resources beyond the free spectral range.
  • FIG. 10 shows a segmented micro-ring resonator cascade device provided by an embodiment of the present invention, and the cascade device can be located at the receiving end.
  • the cascading device specifically includes:
  • each segment of the micro-ring resonator cascading device comprises a filtering module 1001 and a micro-ring resonator group 1002, the first port of the filtering module 1001 and the micro-ring resonator group 1002 The input is connected.
  • the first port of the filtering module 1001 of the filtering module 1001 in the K-th segment micro-ring resonator cascading device and the K-segment micro-ring resonant cavity cascading device are The input end of the microring resonator group 1002, the second port of the filter module 1001 in the Kth segment microring resonator cascade device, and the filter module 1001 in the K-1 segment microring resonator cascade device Three port connection.
  • the device of each micro-ring resonator is as shown in FIG. 12, and includes two waveguides. After the carrier enters from the input terminal, it is filtered and output from the first output terminal, and the remaining carrier passes through the second output terminal to enter the subsequent Microring resonator. As shown in FIG. 12 and FIG. 13, the first output end of each micro-ring resonator in the micro-ring resonator group 1002 in the K-th micro-ring resonator cascade device is the output end of the micro-ring resonator group 1002. Used to output the carrier filtered by each microring resonator.
  • the microring resonator group 1002 is formed by M microring resonator groups 1002, wherein the input end of the first microring resonator is the input end of the microring resonator group 1002, and the input end of the jth microring resonator Connected to the second output of the j-1th microring resonator, M is less than or equal to the free spectral range of the microring resonator group 1002
  • the number of nano-ring resonance peaks, j is a positive integer greater than 1, and M is greater than or equal to j.
  • the second port of the filtering module 1001 in the first-stage micro-ring resonator cascade device is connected to the optical fiber.
  • the microring resonator can be used as a tunable filter.
  • the filtering module 1001 in the K-th micro-resonator cascading device selects the K-th micro-ring resonator cascade.
  • the sub-band corresponding to the device is input to the input end of the micro-ring resonator group 1002 in the K-th micro-resonator cascade device via the first port of the filter module 1001 in the K-th micro-ring resonator cascade device. Filter and output.
  • the width of the sub-band is less than or equal to the free spectral range of any of the micro-ring resonators in the micro-ring resonator group 1002, and the sub-bands corresponding to each micro-ring resonator cascade device are different, and each segment of the micro-ring resonator level
  • the sub-bands corresponding to the connected device cover the bandwidth of the carrier transmitted by the optical fiber, and L and K are positive integers greater than 0, and L is greater than or equal to K.
  • the filtering module 1001 may be a GADC.
  • the GADC is a Bragg grating device having two waveguides, including a first port, a second port, a third port, and a fourth port.
  • the first port of the GADC is a Drop port
  • the second port is Input port
  • the third port is the Through port
  • the fourth port is the Add port.
  • the first port of the GADC of the Kth segment is connected to the input end of the K-segment micro-ring resonator group 1002, and the second port of the K-segment GADC is connected to the third of the K-segment GADC. Port, and so on. That is, the Drop port of the GADC of the Kth segment is connected to the input terminal of the microring resonator group 1002 of the Kth segment, and the input port of the GADC of the Kth segment is connected to the Through port of the GADC of the K-1 segment. 15 is a segmented microring resonator cascade device using GADC instead of filter module 1001.
  • different GADCs correspond to different sub-bands, and the sub-bands corresponding to each GADC are waved at the Drop port and blocked at the Through port.
  • the Drop port filters out the wavelet band 1 (including the carriers 1 to M), and inputs them to the microring resonator group 10021 to M for filtering and output.
  • the width of the wavelet band matches the free spectral range of the microring resonator.
  • the remaining carriers continue to pass from the Through port to GADC-2, and the Drop port filters out
  • the band 2 (including the carrier M+1 to 2M) is input to the next microring resonator group 10021 to M for filtering and output.
  • GADC-L filters out the wavelet band L at the Drop port, and finally completes the filtering of N carriers.
  • the input end of the micro-ring resonator group 1002 is connected to the Drop port of the GADC K.
  • the input port of GADC K is connected to the Through port of GADC K-1.
  • the subband K is output from the Through port of the GADC K-1 and enters the input port of the GADC K.
  • the M carriers in the wavelet band K are waved down the Drop port and input into the corresponding M microring resonators to complete filtering and output.
  • the filtering module 1001 may include a grating, a first circulator, and a second circulator.
  • the grating includes a first port and a second port
  • the first circulator includes a first port, a second port, and a third port
  • the second circulator includes a first port, a second port, and a second port Three ports.
  • the first port of the grating is the third port of the filtering module 1001
  • the second port of the grating is connected to the second port of the first circulator
  • the first port of the first circulator is connected to the third port of the second circulator.
  • the third port of the first circulator is the first port of the filtering module 1001
  • the first port of the second circulator is the fourth port of the filtering module 1001
  • the second port of the second circulator is the second port of the filtering module 1001. .
  • the filter module 1001 is replaced by a grating and two circulators.
  • Each subsection of the segmented microring resonator cascade is comprised of a grating, two circulators, and a microring resonator set 1002.
  • the filter module 1001 includes two three-port circulators, namely a circulator a and a circulator b.
  • the circulator a includes three ports of one port, two ports, and three ports
  • the circulator b includes one port, two ports, and three ports. Three ports, such as ports.
  • the input of the microring resonator group 1002 is connected to the port 3 of the circulator a.
  • the port 1 of the circulator a is connected to the port 3 of the circulator b.
  • the sub-band K enters the port 1 of the circulator a of the K-stage from the 3rd end of the circulator b of the micro-ring resonator cascading device of the upper stage, and enters the 2 port of the circulator a of the K-stage
  • the grating K completes the selection of the M carriers in the wavelet band K, and after the reflection, the lower port of the circulator a of the Kth segment is down-wave, and is input into the micro-ring resonator group 1002 to sequentially perform filtering and output.
  • the circulator The grating can be a fiber-based device or can be monolithically integrated with a cascaded microring resonator.
  • the microring resonator can be used as a tunable filter through which filtering can be performed.
  • the segmented micro-ring resonant cavity cascading device comprises an L-segment micro-ring resonant cavity cascading device, wherein each micro-ring resonant cavity cascading device comprises a filtering module and a micro-ring resonant cavity group, and filtering
  • the first port of the module is connected to the input end of the micro-ring resonator group, and the second port of the filter module in the K-segment micro-ring resonator cascade device and the filter in the K-1 segment micro-ring resonator cascade device
  • the third port of the module is connected, wherein when the carrier of the optical fiber passes through the K-th micro-resonator cascading device, the filtering module in the K-th micro-resonator cascading device selects the K-th micro-resonator cavity
  • the sub-band corresponding to the connected device is input to the input end of the micro-ring resonator group in the K-th micro-resonator casca
  • each carrier in the wavelet band can be effectively filtered by the micro-ring resonator in the segment, which solves the problem that when the bandwidth of the dressing spectrum light source is larger than
  • the free spectral range of the microring resonator is a problem of wasted carrier resources beyond the free spectral range.

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Abstract

一种分段式微环谐振腔级联装置，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括滤波模块和微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接，第K段的微环谐振腔组的输出端与第K－1段的滤波模块的第四端口连接，梳妆谱光源发出的载波经过第K段微环谐振腔级联设备时，滤波模块选出第K段的子波带，经滤波模块的第一端口输入到微环谐振腔组的输入端进行调整并合波。通过上述分段式微环谐振腔级联装置进行调制和合波，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效调制，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。

Description

一种分段式微环谐振腔级联装置 技术领域
本发明实施例涉及光通信技术领域，尤其涉及一种分段式微环谐振腔级联装置。
背景技术
随着数据中心业务量的不断提升，其规模不断变大。数据中心内部互连距离达到2km，而数据中心之间的传输距离达到100km，单个光接口的数据率可达Tbit/s。数据中心架构由传统的三层南北互连转变为基于叶脊结构的东西互连。这种新型互连架构提出了如下要求：1)更大的光互连接口流量；2)更低的光模块功耗、尺寸以及成本；3)更低的网络延迟。
针对以上需求，梳状谱光源(Comb source)激光器+级联微环谐振腔(Microring resonator series)的光模块被提出。该架构利用单个激光器输出多波长特性、以及微环独有的合分波、调制双重功能，具有Gbps至Tbps的流量Scalability，并降低光模块功耗，尺寸及成本。
宽带梳状谱光源具有多个载波，每个载波的波长与微环谐振腔串中的微环一一对应。如图1所示，发射端级联的每个微环调制器完成其中一个载波上的调制，并自动合波(Mux)通过光纤传输至接收端。在接收端，每个载波通过相应的一个微环实现分波(Demux)。微环谐振腔的谐振波长具有周期性，每相邻的两个谐振波长之间的间隔被称为自由光谱范围(FSR，Free Spectral Range)，FSR的大小与微环的直径成反比。为保证较高的调制效率以及较低的插损，微环的直径不能太小，通常为十几个微米，对应的FSR约为10nm。当宽带梳状谱的带宽大于FSR时，超出FSR的载波将被同一个微环的相邻谐振波长调制上同样的数据，造成载波资源的浪费。例如图2所示，子波带的宽度与微环FSR相同，子波带1内的6个谐振波长来自6个微环，而子波带2内6个谐振波长来自相同的6个微环。因此，当梳妆谱光源有12个载波输 入时，位于子波带1的6个载波上调制的数据与位于子波带2的6个载波上调制的数据将完全相同，浪费一半的载波资源。
发明内容
本发明实施例提供一种分段式微环谐振腔级联装置，用以解决当梳妆谱的带宽大于微环FSR时，超出FSR的载波资源被浪费的问题。
第一方面，提供的一种分段式微环谐振腔级联装置，包括：L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接；
L段微环谐振腔级联设备中第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接，第K段微环谐振腔级联设备中的微环谐振腔组的输出端与第K－1段微环谐振腔级联设备中的滤波模块的第四端口连接；第一段微环谐振腔级联设备中的微环谐振腔组的输出端为分段式微环谐振腔级联装置的输出端，用于输出各子波带的合波；第一段微环谐振腔级联设备中的滤波模块的第二端口与梳妆谱光源连接；
其中，第K段微环谐振腔级联设备中的滤波模块，用于在梳妆谱光源发出的载波经过第K段微环谐振腔级联设备时，选出第K段微环谐振腔级联设备对应的子波带，经第K段微环谐振腔级联设备中的滤波模块的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行调制并合波；
其中，第K段微环谐振腔级联设备对应的子波带的宽度小于等于第K段微环谐振腔级联设备中的微环谐振腔组中任一微环谐振腔的自由光谱范围，每段微环谐振腔级联设备对应的子波带不同，各段微环谐振腔级联设备对应的子波带组合后覆盖梳妆谱光源发出的载波的带宽，L为大于2的正整数，K为大于1的正整数，L大于等于K。
通过上述分段式微环谐振腔级联装置进行调制和合波，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效调制，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。
结合第一方面，在第一方面的第一种可能的实现方式中，滤波模块为光栅辅助定向耦合器。
通过光栅辅助定向耦合器代替滤波模块，可以快速的选出每段微环谐振腔级联设备对应的子波带。
结合第一方面，在第一方面的第二种可能的实现方式中，滤波模块包括光栅、第一环形器和第二环形器；
光栅包括第一端口和第二端口，第一环形器包括第一端口、第二端口、第三端口，第二环形器包括第一端口、第二端口、第三端口；
光栅的第一端口与滤波模块的第三端口连接，光栅的第二端口与第一环形器的第二端口连接；
第一环形器的第一端口与第二环形器的第三端口连接，第一环形器的第三端口与滤波模块的第一端口连接；
第二环形器的第一端口与滤波模块的第四端口连接，第二环形器的第二端口与滤波模块的第二端口连接。
通过光栅和两个环形器的结合代替滤波模块，可以快速的选出每段微环谐振腔级联设备对应的子波带。
结合第一方面或者第一方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第一方面的第三种可能的实现方式中，第L段微环谐振腔级联设备中的滤波模块的第三端口和第四端口连接有光吸收装置，用于吸收剩余的光载波。
结合第一方面或者第一方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第一方面的第四种可能的实现方式中， 微环谐振腔组由M个微环谐振腔串联组成，其中，M小于或等于微环谐振腔组的自由光谱范围所容纳的微环谐振峰的个数。
结合第一方面或者第一方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第一方面的第五种可能的实现方式中，微环谐振腔作为电光调制器使用。
第二方面，提供一种分段式微环谐振腔级联装置，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接；
L段微环谐振腔级联设备中第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接；第一段微环谐振腔级联设备中的滤波模块的第二端口与光纤连接；
其中，光纤传输的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块选出第K段微环谐振腔级联设备对应的子波带，经第K段微环谐振腔级联设备中的滤波模块的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行滤波和输出；
其中，第K段微环谐振腔级联设备对应的子波带的宽度小于等于第K段微环谐振腔级联设备对应的微环谐振腔组中任一微环谐振腔的自由光谱范围，每段微环谐振腔级联设备对应的子波带不同，各段微环谐振腔级联设备对应的子波带组合后覆盖光纤传输的载波的带宽，L和K为大于0的正整数，L大于等于K。
通过上述分段式微环谐振腔级联装置进行滤波和输出，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效滤波，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。
结合第二方面，在第二方面的第一种可能的实现方式中，滤波模块为光栅辅助定向耦合器。
通过光栅辅助定向耦合器代替滤波模块，可以快速的选出每段微环谐振腔级联设备对应的子波带。
结合第二方面，在第二方面的第二种可能的实现方式中，滤波模块包括光栅、第一环形器和第二环形器；
光栅包括第一端口和第二端口，第一环形器包括第一端口、第二端口、第三端口，第二环形器包括第一端口、第二端口、第三端口；
光栅的第一端口与滤波模块的第三端口连接，光栅的第二端口与第一环形器的第二端口连接；
第一环形器的第一端口与第二环形器的第三端口连接，第一环形器的第三端口与滤波模块的第一端口连接；
第二环形器的第一端口与滤波模块的第四端口连接，第二环形器的第二端口与滤波模块的第二端口连接。
通过光栅和两个环形器的结合代替滤波模块，可以快速的选出每段微环谐振腔级联设备对应的子波带。
结合第二方面或者第二方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第二方面的第三种可能的实现方式中，第K段微环谐振腔级联设备中的微环谐振腔组中每个微环谐振腔的第一输出端为微环谐振腔组的输出端，用于输出经过每个微环谐振腔滤波后的载波。
结合第二方面或者第二方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第二方面的第四种可能的实现方式中，微环谐振腔组由M个微环谐振腔组成，其中，第一个微环谐振腔的输入端为微环谐振腔组的输入端，第j个微环谐振腔的输入端与第j－1个微环谐振腔的第二输出端连接，M小于或等于微环谐振腔组的自由光谱范围所容纳的微环谐振峰的个数，j为大于1的正整数，M大于等于j。
结合第二方面或者第二方面的第一种可能的实现方式至第二种可能的实现方式中任意一种可能的实现方式，在第二方面的第五种可能的实现方式中， 微环谐振腔作为可调滤波器使用。
本发明实施例提供的分段式微环谐振腔级联装置，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接，第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接，第K段微环谐振腔级联设备中的微环谐振腔组的输出端与第K－1段微环谐振腔级联设备中的滤波模块的第四端口连接，其中，梳妆谱光源发出的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块选出第K段微环谐振腔级联设备对应的子波带，经滤波模块的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行调整并合波。通过上述分段式微环谐振腔级联装置进行调制和合波，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效调制，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍。
图1为现有技术中提供的一种微环谐振腔级联装置的示意图；
图2为现有技术中提供的一种载波调制的示意图；
图3为本发明实施例提供的一种系统架构的示意图；
图4为本发明实施例中提供的一种分段式微环谐振腔级联装置的示意图；
图5为本发明实施例中提供的第K段微环谐振腔级联设备的示意图；
图6为本发明实施例中提供的一种GADC的装置示意图；
图7为本发明实施例中提供的第K段微环谐振腔级联设备的示意图；
图8为本发明实施例中提供的一种分段式微环谐振腔级联装置的示意图；
图9为本发明实施例中提供的一种滤波模块的示意图；
图10为本发明实施例中提供的一种分段式微环谐振腔级联装置的示意图；
图11为本发明实施例中提供的第K段微环谐振腔级联设备的示意图；
图12为本发明实施例中提供的一种微环谐振腔的装置示意图；
图13为本发明实施例中提供的一种微环谐振腔组的装置示意图；
图14为本发明实施例中提供的第K段微环谐振腔级联设备的示意图；
图15为本发明实施例中提供的一种分段式微环谐振腔级联装置的示意图；
图16为本发明实施例中提供的一种滤波模块的示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图及实施例对本发明作进一步地详细描述。
图3示出了本发明实施例提供的一种系统架构，该系统架构包括激光器301、发射机302、接收机303。激光器通过光纤与发射机相连，用于为该发射机提供光源，发射机通过光纤与接收机相连，发射机中级联的每个微环谐振腔完成其中一个载波上的调制之后，自动合波通过光纤发送到接收机，接收机再通过相应的微环谐振腔实现分波，并输入到PD进行光电转换。
本发明实施例提供的分段式微环谐振腔级联装置位于上述发射机或接收机，基于上述描述，图4示出了本发明实施例提供的一种分段式微环谐振腔级联装置，该级联装置可以位于发射端。
如图4所示，该级联装置具体包括：
L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块401和一个微环谐振腔组402，该滤波模块401的第一端口与微环谐振腔组402的输入端连接。
在上述L段微环谐振腔级联设备中，如图5所示，第K段微环谐振腔级联设备中的滤波模块401的第二端口与第K－1段微环谐振腔级联设备中的滤波模块401的第三端口连接，第K段微环谐振腔级联设备中的微环谐振腔组402的输出端与第K－1段微环谐振腔级联设备中的滤波模块401的第四端口连接，第K段的滤波模块401的第一端口与第K段的微环谐振腔组402的输入端连接，其中，L为大于0的正整数，K为大于1的正整数，L大于等于K。
在进行光通信时，梳妆谱光源发出的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块401选出该第K段微环谐振腔级联设备对应子波带，经该第K段微环谐振腔级联设备中的滤波模块401的第一端口输入到该第K段微环谐振腔级联设备中的微环谐振腔组402的输入端进行调制并合波。
具体的，当K＝1时，第一段微环谐振腔级联设备中的滤波模块401的第二端口与梳妆谱光源连接，梳妆谱光源发出N个载波，该N个载波被分为L个子波带，微环谐振腔串被分为L个微环谐振腔组402，每一组微环谐振腔对应一个子波带。梳妆谱光源发出的L个子波带，经过第一段微环谐振腔级联设备中的滤波模块401的第二端口进入到该分段式微环谐振腔级联装置，此时该L个子波带经过第一段的滤波模块401之后，会将第一个子载波选出来，该第一子波带经过该第一段的滤波模块401的第一端口进入到该第一段的微环谐振腔组402中。
在本发明实施例中子波带的宽度小于等于微环谐振腔组402中任一微环谐振腔的自由光谱范围，每段微环谐振腔级联设备对应的子波带不同，各段微环谐振腔级联设备对应的子波带组合后覆盖梳妆谱光源发出的载波的带宽。通过上述分段式微环谐振腔级联装置进行调制和合波，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效调制，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资 源被浪费的问题。
上述微环谐振腔组402是由M个微环谐振腔串联组成，如图5所示，图5中的M个微环谐振腔串联，第一个微环谐振腔的输入端与滤波模块401的第一端口连接，第一个微环谐振腔的输出端与第二个微环谐振腔的输入端连接，第二个微环谐振腔的输出端与第三个微环谐振腔的输入端连接，依次类推，第M个微环谐振腔的输出端与滤波模块401的第四端口连接。其中，M小于或等于微环谐振腔组402的自由光谱范围所容纳的微环谐振峰的个数。
为了使得本发明实施例中分段式微环谐振腔级联装置能够实现载波输出，第一段微环谐振腔级联设备中的微环谐振腔组402的输出端为本发明实施例中分段式微环谐振腔级联装置的输出端。也就是说，第一子波带经过该第一段的滤波模块401的第一端口进入到该第一段的微环谐振腔组402中进行调整并合波之后，将合波通过该第一段微环谐振腔级联设备中的微环谐振腔组402的输出端进行输出。而后续第二段、第三段一直到第L段的微环谐振腔级联设备中的微环谐振腔组402的输出端都各自经过其前一段的微环谐振腔级联设备之后传输到第一段的微环谐振腔级联设备中的微环谐振腔组402的输出端。
优选地，上述第L段微环谐振腔级联设备中的滤波模块401的第三端口和第四端口连接有光吸收装置，用于吸收剩余的光载波，以免形成反射噪声。
为了更好的实现本发明的技术方案，上述滤波模块401可以为GADC(Grating assisted Directional Coupler，光栅辅助定向耦合器)。如图6所示，该GADC是具有两根波导的布拉格光栅装置，包括有第一端口、第二端口、第三端口和第四端口，该GADC的第一端口为Drop(下波)端口，第二端口为Input(输入)端口，第三端口为Through(导通)端口，第四端口为Add(累加)端口。
如图7所示，第K段的GADC的第一端口连接第K段的微环谐振腔组402的输入端，第K段的GADC的第二端口连接第K－1段的GADC的第三 端口，第K段的微环谐振腔组402的输出端连接第K－1段的GADC的第四端口，依次类推。也就是说，第K段的GADC的Drop端口连接第K段的微环谐振腔组402的输入端，第K段的GADC的Input端口连接第K－1段的GADC的Through端口，第K段的微环谐振腔组402的输出端连接第K－1段的GADC的Add端口。图8为使用GADC替代滤波模块401的分段式微环谐振腔级联装置。
在本发明实施例中，不同的GADC对应不同的子波带，每个GADC对应的子波带在Drop端口下波，在Through端口被阻止。梳妆谱光源经过GADC-1后，Drop端滤出子波带1(包含载波1～M)，输入到微环谐振腔组4021～M分别进行调制并合波。子波带的宽度与微环谐振腔的自由光谱范围相匹配。剩余的载波从Through端继续传到GADC-2，Drop端滤出子波带2(包含载波M+1～2M)，输入到下一个微环谐振腔组4021～M进行调制，接入GADC-1的Add端口完成合波。以此类推，GADC-L在Drop端滤出子波带L，最终完成N个载波的完全调制与合波(N＝L*M)，并从最终的第一段的微环谐振腔组402的输出端输出。
以分段式微环谐振腔级联装置的第K段为例，微环谐振腔组402的输入端与GADC K的Drop端相连，输出端与上一级GADC K－1的Add端相连。GADC K的Input端口与上一级GADC K－1的Through端相连。子波带K从上一级GADC K－1的Through端输出，进入GADC K的Input端口。子波带K中的M个载波在Drop端下波并输入到相应的M个微环谐振腔中各自完成调制并合波，然后从GADC K－1的Add端口输出。需要指出的是，子波带K中调制后的载波会直接从最终的第一段的微环谐振腔组402的输出端输出，不会被其他子段的微环谐振腔再调制，也不会被其他GADC阻断。
为了更好的实现本发明的技术方案，上述滤波模块401可以包括光栅、第一环形器和第二环形器。如图9所示，该光栅包括第一端口和第二端口，该第一环形器包括第一端口、第二端口、第三端口，该第二环形器包括第一 端口、第二端口、第三端口。该光栅的第一端口为该滤波模块401的第三端口，该光栅的第二端口与该第一环形器的第二端口连接，该第一环形器的第一端口与该第二环形器的第三端口连接，该第一环形器的第三端口为该滤波模块401的第一端口，该第二环形器的第一端口为该滤波模块401的第四端口，该第二环形器的第二端口为该滤波模块401的第二端口。
在本发明实施例中，只是在每一段微环谐振腔级联设备中滤波模块401被光栅和两个环形器替代。分段式微环谐振腔级联装置的每个子段由光栅、2个环形器和微环谐振腔组402组成。比如，滤波模块401包括两个三口环形器，分别为环形器a和环形器b，环形器a包括1端口、2端口、3端口等三个端口，环形器b包括1端口、2端口、3端口等三个端口。微环谐振腔组402的输入端与环形器a的3端口相连，微环谐振腔组402的输出端与环形器b的1端口相连。环形器a的1端口与环形器b的3端口相连。在工作时：子波带K从上一段的微环谐振腔级联设备的环形器b的3端进入第K段的环形器a的1端口，经第K段的环形器a的2端口进入光栅K完成子波带K中M个载波的滤波，反射后从第K段的环形器a的3端口下波，输入到微环谐振腔组402中依次完成调制与和合波，并接入第K段的环形器b的1端口输出。其中的环形器和光栅可以是基于光纤的器件，也可以与级联的微环谐振腔单片集成。
在本发明实施例中，每一段中的微环谐振腔组402中的微环谐振腔可以作为电光调制器使用，通过该微环谐振腔可以调制载波。
本发明实施例提供的分段式微环谐振腔级联装置，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接，第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接，第K段微环谐振腔级联设备中的微环谐振腔组的输出端与第K－1段微环谐振腔级联设备中的滤波模块的第四端口连接，其 中，梳妆谱光源发出的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块选出第K段微环谐振腔级联设备对应的子波带，经滤波模块的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行调整并合波。通过上述分段式微环谐振腔级联装置进行调制和合波，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效调制，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。
基于相同的技术构思，图10示出了本发明实施例提供的一种分段式微环谐振腔级联装置，该级联装置可以位于接收端。
如图10所示，该级联装置具体包括：
L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块1001和一个微环谐振腔组1002，该滤波模块1001的第一端口与该微环谐振腔组1002的输入端连接。
在本发明实施例中，如图11所示，该第K段微环谐振腔级联设备中的滤波模块1001的滤波模块1001的第一端口与该第K段微环谐振腔级联设备中的微环谐振腔组1002的输入端，第K段微环谐振腔级联设备中的滤波模块1001的第二端口与第K－1段微环谐振腔级联设备中的滤波模块1001的第三端口连接。
在本发明实施例中每个微环谐振腔的装置如图12所示，包含有两根波导，载波从输入端进入后经过滤波从第一输出端输出，剩余载波经过第二输出端进入后续的微环谐振腔。结合图12和图13所示，第K段微环谐振腔级联设备中的微环谐振腔组1002中每个微环谐振腔的第一输出端为微环谐振腔组1002的输出端，用于输出经过每个微环谐振腔滤波后的载波。微环谐振腔组1002由M个微环谐振腔组1002成，其中，第一个微环谐振腔的输入端为微环谐振腔组1002的输入端，第j个微环谐振腔的输入端与第j－1个微环谐振腔的第二输出端连接，M小于或等于微环谐振腔组1002的自由光谱范围所容 纳的微环谐振峰的个数，j为大于1的正整数，M大于等于j。第一段微环谐振腔级联设备中的滤波模块1001的第二端口与光纤连接。微环谐振腔可以做为可调滤波器使用。
在本发明实施例中，光纤传输的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块1001选出第K段微环谐振腔级联设备对应的子波带，经第K段微环谐振腔级联设备中的滤波模块1001的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组1002的输入端进行滤波和输出。其中，子波带的宽度小于等于微环谐振腔组1002中任一微环谐振腔的自由光谱范围，每段微环谐振腔级联设备对应的子波带不同，各段微环谐振腔级联设备对应的子波带组合后覆盖光纤传输的载波的带宽，L和K为大于0的正整数，L大于等于K。
为了更好的实现本发明的技术方案，上述滤波模块1001可以为GADC。如图6所示，该GADC是具有两根波导的布拉格光栅装置，包括有第一端口、第二端口、第三端口和第四端口，该GADC的第一端口为Drop端口，第二端口为Input端口，第三端口为Through端口，第四端口为Add端口。
如图14所示，第K段的GADC的第一端口连接第K段的微环谐振腔组1002的输入端，第K段的GADC的第二端口连接第K－1段的GADC的第三端口，依次类推。也就是说，第K段的GADC的Drop端口连接第K段的微环谐振腔组1002的输入端，第K段的GADC的Input端口连接第K－1段的GADC的Through端口。图15为使用GADC替代滤波模块1001的分段式微环谐振腔级联装置。
在本发明实施例中，不同的GADC对应不同的子波带，每个GADC对应的子波带在Drop端口下波，在Through端口被阻止。光纤传输的载波经过GADC-1后，Drop端口滤出子波带1(包含载波1～M)，输入到微环谐振腔组10021～M分别进行滤波和输出。子波带的宽度与微环谐振腔的自由光谱范围相匹配。剩余的载波从Through端口继续传到GADC-2，Drop端口滤出子 波带2(包含载波M+1～2M)，输入到下一个微环谐振腔组10021～M进行滤波和输出。以此类推，GADC-L在Drop端口滤出子波带L，最终完成N个载波的滤波。
以分段式微环谐振腔级联装置的第K段为例，微环谐振腔组1002的输入端与GADC K的Drop端口相连。GADC K的Input端口与GADC K－1的Through端口相连。子波带K从GADC K－1的Through端口输出，进入GADC K的Input端口。子波带K中的M个载波在Drop端口下波并输入到相应的M个微环谐振腔中各自完成滤波和输出。
为了更好的实现本发明的技术方案，上述滤波模块1001可以包括光栅、第一环形器和第二环形器。如图16所示，该光栅包括第一端口和第二端口，该第一环形器包括第一端口、第二端口、第三端口，该第二环形器包括第一端口、第二端口、第三端口。该光栅的第一端口为滤波模块1001的第三端口，光栅的第二端口与第一环形器的第二端口连接，第一环形器的第一端口与第二环形器的第三端口连接，第一环形器的第三端口为滤波模块1001的第一端口，第二环形器的第一端口为滤波模块1001的第四端口，第二环形器的第二端口为滤波模块1001的第二端口。
在本发明实施例中，只是在每一段微环谐振腔级联设备中滤波模块1001被光栅和两个环形器替代。分段式微环谐振腔级联装置的每个子段由光栅、2个环形器和微环谐振腔组1002组成。比如，滤波模块1001包括两个三口环形器，分别为环形器a和环形器b，环形器a包括1端口、2端口、3端口等三个端口，环形器b包括1端口、2端口、3端口等三个端口。微环谐振腔组1002的输入端与环形器a的3端口相连。环形器a的1端口与环形器b的3端口相连。在工作时：子波带K从上一段的微环谐振腔级联设备的环形器b的3端进入第K段的环形器a的1端口，经第K段的环形器a的2端口进入光栅K完成子波带K中M个载波的选波，反射后从第K段的环形器a的3端口下波，输入到微环谐振腔组1002中依次完成滤波和输出。其中的环形器 和光栅可以是基于光纤的器件，也可以与级联的微环谐振腔单片集成。
在本发明实施例中，微环谐振腔可以作为可调滤波器使用，通过该微环谐振腔可以进行滤波。
本发明实施例提供的分段式微环谐振腔级联装置，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，滤波模块的第一端口与微环谐振腔组的输入端连接，第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接，其中，光纤传输的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块选出第K段微环谐振腔级联设备对应的子波带，经滤波模块的第一端口输入到第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行滤波和输出。通过上述分段式微环谐振腔级联装置进行滤波和输出，可以保证子波带中的每个载波都可以通过该段中的微环谐振腔实现有效滤波，解决了当梳妆谱光源的带宽大于微环谐振腔的自由光谱范围，超出自由光谱范围的载波资源被浪费的问题。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。显然，本领域的技术人员可以对本发明各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (10)

  1. 一种分段式微环谐振腔级联装置，其特征在于，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，所述滤波模块的第一端口与所述微环谐振腔组的输入端连接；
    所述L段微环谐振腔级联设备中第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接，第K段微环谐振腔级联设备中的微环谐振腔组的输出端与所述第K－1段微环谐振腔级联设备中的滤波模块的第四端口连接；第一段微环谐振腔级联设备中的微环谐振腔组的输出端为所述分段式微环谐振腔级联装置的输出端，用于输出各子波带的合波；第一段微环谐振腔级联设备中的滤波模块的第二端口与所述梳妆谱光源连接；
    其中，所述第K段微环谐振腔级联设备中的滤波模块，用于在梳妆谱光源发出的载波经过所述第K段微环谐振腔级联设备时，选出所述第K段微环谐振腔级联设备对应的子波带，经所述第K段微环谐振腔级联设备中的滤波模块的第一端口输入到所述第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行调制并合波；
    其中，所述第K段微环谐振腔级联设备对应的子波带的宽度小于等于所述第K段微环谐振腔级联设备中的微环谐振腔组中任一微环谐振腔的自由光谱范围，每段所述微环谐振腔级联设备对应的子波带不同，各段微环谐振腔级联设备对应的子波带组合后覆盖所述梳妆谱光源发出的载波的带宽，L为大于2的正整数，K为大于1的正整数，L大于等于K。
  2. 如权利要求1所述的分段式微环谐振腔级联装置，其特征在于，所述滤波模块为光栅辅助定向耦合器。
  3. 如权利要求1所述的分段式微环谐振腔级联装置，其特征在于，所述滤波模块包括光栅、第一环形器和第二环形器；
    所述光栅包括第一端口和第二端口，所述第一环形器包括第一端口、第 二端口、第三端口，所述第二环形器包括第一端口、第二端口、第三端口；
    所述光栅的第一端口与所述滤波模块的第三端口连接，所述光栅的第二端口与所述第一环形器的第二端口连接；
    所述第一环形器的第一端口与所述第二环形器的第三端口连接，所述第一环形器的第三端口与所述滤波模块的第一端口连接；
    所述第二环形器的第一端口与所述滤波模块的第四端口连接，所述第二环形器的第二端口与所述滤波模块的第二端口连接。
  4. 如权利要求1至3任一项所述的分段式微环谐振腔级联装置，其特征在于，第L段微环谐振腔级联设备中的滤波模块的第三端口和第四端口连接有光吸收装置，用于吸收剩余的光载波。
  5. 如权利要求1至3任一项所述的分段式微环谐振腔级联装置，其特征在于，所述微环谐振腔组由M个微环谐振腔串联组成，其中，M小于或等于所述微环谐振腔组的自由光谱范围所容纳的微环谐振峰的个数。
  6. 一种分段式微环谐振腔级联装置，其特征在于，包括L段微环谐振腔级联设备，其中每段微环谐振腔级联设备包括一个滤波模块和一个微环谐振腔组，所述滤波模块的第一端口与所述微环谐振腔组的输入端连接；
    所述L段微环谐振腔级联设备中第K段微环谐振腔级联设备中的滤波模块的第二端口与第K－1段微环谐振腔级联设备中的滤波模块的第三端口连接；第一段微环谐振腔级联设备中的滤波模块的第二端口与所述光纤连接；
    其中，光纤传输的载波经过第K段微环谐振腔级联设备时，第K段微环谐振腔级联设备中的滤波模块选出所述第K段微环谐振腔级联设备对应的子波带，经所述第K段微环谐振腔级联设备中的滤波模块的第一端口输入到所述第K段微环谐振腔级联设备中的微环谐振腔组的输入端进行滤波和输出；
    其中，所述第K段微环谐振腔级联设备对应的子波带的宽度小于等于所述第K段微环谐振腔级联设备对应的微环谐振腔组中任一微环谐振腔的自由光谱范围，每段所述微环谐振腔级联设备对应的子波带不同，各段微环谐振 腔级联设备对应的子波带组合后覆盖所述光纤传输的载波的带宽，L和K为大于0的正整数，L大于等于K。
  7. 如权利要求6所述的分段式微环谐振腔级联装置，其特征在于，所述滤波模块为光栅辅助定向耦合器。
  8. 如权利要求6所述的分段式微环谐振腔级联装置，其特征在于，所述滤波模块包括光栅、第一环形器和第二环形器；
    所述光栅包括第一端口和第二端口，所述第一环形器包括第一端口、第二端口、第三端口，所述第二环形器包括第一端口、第二端口、第三端口；
    所述光栅的第一端口与所述滤波模块的第三端口连接，所述光栅的第二端口与所述第一环形器的第二端口连接；
    所述第一环形器的第一端口与所述第二环形器的第三端口连接，所述第一环形器的第三端口与所述滤波模块的第一端口连接；
    所述第二环形器的第一端口与所述滤波模块的第四端口连接，所述第二环形器的第二端口与所述滤波模块的第二端口连接。
  9. 如权利要求6至8任一项所述的分段式微环谐振腔级联装置，其特征在于，第K段微环谐振腔级联设备中的微环谐振腔组中每个微环谐振腔的第一输出端为所述微环谐振腔组的输出端，用于输出经过每个微环谐振腔滤波后的载波。
  10. 如权利要求6至8任一项所述的分段式微环谐振腔级联装置，其特征在于，所述微环谐振腔组由M个微环谐振腔组成，其中，第一个微环谐振腔的输入端为所述微环谐振腔组的输入端，第j个微环谐振腔的输入端与第j－1个微环谐振腔的第二输出端连接，M小于或等于所述微环谐振腔组的自由光谱范围所容纳的微环谐振峰的个数，j为大于1的正整数，M大于等于j。
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