# US 2011/0299852 A1 · Optical transmission and reception system, optical transmitting and receiving apparatus, and optical transmission and reception method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2011/0299852 A1 - Document ID: US20110299852A1 - Status: Published application - Kind: A1 - Application number: 13/202,001 - Filed: 2009-04-13 - Published: 2011-12-08 - Earliest claimed: 2009-04-13 - Assignees: Mitsubishi Electric Corporation - Inventors: Takashi Mizuochi - Web page: https://patentgrep.com/patent/US20110299852A1 ## CPC - H04L 27/2096: {Arrangements for directly or externally modulating an optical carrier (optical modulation H04B10/503)} - H04B 10/5561: {Digital phase modulation} - H04B 10/677: {for differentially modulated signal, e.g. DPSK signals} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract An optical transmission and reception system in which a plurality of tributary signals are converted into multilevel modulated light for transmission and reception. An apparatus for transmitting multilevel modulated light includes: FECs which perform error correction processing including addition of a tributary identifier; and a GEAR BOX which performs rate conversion on the processed signals. An apparatus for receiving multilevel modulated light includes: a 20G DQPSK REC which separates received multilevel modulated light into received tributary signals and outputs the signals to respective output systems; the GEAR BOX which performs rate conversion on the received tributary signals; the FECs which extract tributary identifiers from the received tributary signals; a TIM which compares tributary identifiers defined for the respective output systems in advance with the tributary identifies extracted; and a tributary selector which gives an instruction to change correspondence between the received tributary signals and the output systems if the result of comparison is a mismatch. ## Claims ### Claim 1 An optical transmission and reception system including a transmitting apparatus for converting a plurality of tributary signals into a single beam of multilevel modulated light for transmission, and a receiving apparatus for receiving multilevel modulated light and converts it into a plurality of tributary signals, the transmitting apparatus comprising: error correction processing means for applying error correction coding processing to each individual one of the tributary signals, the error correction coding processing including addition of a tributary identifier for identifying a tributary; transmission-side rate conversion means for performing rate conversion by adding predetermined data to the signals given the error correction coding processing so that the signals have the same transmission rate; and multilevel modulation means for converting the signals rate-converted by the transmission-side rate conversion means into a single beam of multilevel modulated light, the receiving apparatus comprising: multilevel modulated light receiving means for receiving multilevel modulated light, separating a received signal into tributary signals, and outputting the separated signals as received tributary signals to respective different output systems; reception-side rate conversion means for performing rate conversion by deleting the predetermined data from the received tributary signals; error correction decoding processing means for performing error correction decoding processing on the received tributary signals rate-converted by the reception-side rate conversion means and extracting the tributary identifiers from the received tributary signals or the rate-converted received tributary signals output system by output system; tributary detection means for retaining tributary identifiers defined for the respective output systems in advance as output system tributary identifiers, comparing the output system tributary identifier of each output system with the tributary identifier that is extracted from the received tributary signal output to the output system, and making a notification as to a match or mismatch as a result of comparison; and tributary select means for giving an instruction to change correspondence between the received tributary signals output from the multilevel modulated light receiving means and the output systems if the result of comparison is a mismatch, the multilevel modulated light receiving means changing the correspondence between the received tributary signals to output and the output systems based on the instruction from the tributary select means. ### Claim 2 An optical transmission and reception system including a first transmitting apparatus and a second transmitting apparatus each of which is a transmitting apparatus for converting a plurality of tributary signals into a single beam of multilevel modulated light for transmission, and a first receiving apparatus and a second receiving apparatus each of which is a receiving apparatus for receiving multilevel modulated light and converts it into a plurality of tributary signals, the optical transmission and reception system comprising: a polarization multiplexing apparatus for multiplexing the multilevel modulated light transmitted by the first transmitting apparatus and the multilevel modulated light transmitted by the second transmitting apparatus so that the beams of multilevel modulated light are polarized orthogonal to each other, and transmitting the resultant as a multiplexed signal; a frequency offset apparatus for controlling to a predetermined value a difference in wavelength between the multilevel modulated light transmitted by the first transmitting apparatus and the multilevel modulated light transmitted by the second transmitting apparatus; and an optical splitting apparatus for, when receiving a multiplexed signal, splitting the multiplexed signal and outputs the split signals to the first receiving apparatus and the second receiving apparatus, respectively, the transmitting apparatus comprising: error correction processing means for applying error correction coding processing to each individual one of the tributary signals, the error correction coding processing including addition of a tributary identifier for identifying a tributary; transmission-side rate conversion means for performing rate conversion by adding predetermined data to the signals given the error correction coding processing so that the signals have the same transmission rate; and multilevel modulation means for converting the signals rate-converted by the transmission-side rate conversion means into a single beam of multilevel modulated light, the receiving apparatus comprising: multilevel modulated light receiving means for receiving multilevel modulated light, separating a received signal into tributary signals, and outputting the separated signals as received tributary signals to respective different output systems; reception-side rate conversion means for performing rate conversion by deleting the predetermined data from the received tributary signals; error correction decoding processing means for performing error correction decoding processing on the received tributary signals rate-converted by the reception-side rate conversion means and extracting the tributary identifiers from the received tributary signals or the rate-converted received tributary signals output system by output system; tributary detection means for retaining tributary identifiers defined for the respective output systems in advance as output system tributary identifiers, comparing the output system tributary identifier of each output system with the tributary identifier that is extracted from the received tributary signal output to the output system, and making a notification as to a match or mismatch as a result of comparison; and tributary select means for giving an instruction to change correspondence between the received tributary signals output from the multilevel modulated light receiving means and the output systems if the result of comparison is a mismatch, the multilevel modulated light receiving means changing the correspondence between the received tributary signals to output and the output systems based on the instruction from the tributary select means. ### Claim 3 (depends on 1) The optical transmission and reception system according to claim 1, wherein with one of the tributary signals that has a maximum transmission rate as a fastest tributary signal, the reception-side rate conversion means adds the predetermined data to the tributary signal other than the fastest tributary signal so that the tributary signal other than the fastest tributary signal has the same transmission rate as that of the fastest tributary signal, and assume the fastest tributary signal as a rate-converted tributary signal without adding the predetermined data. ### Claim 4 (depends on 3) The optical transmission and reception system according to claim 3, wherein the multilevel modulated light receiving means outputs a reception-side tributary signal that is to be output to the output system corresponding to the output system tributary identifier that represents the fastest tributary signal, to the error correction decoding processing means as a rate-converted reception-side tributary signal without intervention of the reception-side rate conversion means. ### Claim 5 (depends on 1) The optical transmission and reception system according to claim 1, wherein the multilevel modulated light is differential quadrature phase shift keying light. ### Claim 6 (depends on 2) The optical transmission and reception system according to claim 2, wherein the multilevel modulated light is differential quadrature phase shift keying light. ### Claim 7 (depends on 3) The optical transmission and reception system according to claim 3, wherein the multilevel modulated light is differential quadrature phase shift keying light. ### Claim 8 (depends on 4) The optical transmission and reception system according to claim 4, wherein the multilevel modulated light is differential quadrature phase shift keying light. ### Claim 9 (depends on 1) The optical transmission and reception system according to claim 1, wherein the multilevel modulated light is quadrature phase shift keying light. ### Claim 10 (depends on 2) The optical transmission and reception system according to claim 2, wherein the multilevel modulated light is quadrature phase shift keying light. ### Claim 11 (depends on 3) The optical transmission and reception system according to claim 3, wherein the multilevel modulated light is quadrature phase shift keying light. ### Claim 12 (depends on 4) The optical transmission and reception system according to claim 4, wherein the multilevel modulated light is quadrature phase shift keying light. ### Claim 13 (depends on 1) The optical transmission and reception system according to claim 1, wherein at least one of the tributary signals is used as an STM-64 signal, and at least one of the tributary signals is used as a 10-Gigabit Ethernet™ signal. ### Claim 14 (depends on 1) The optical transmission and reception system according to claim 1, wherein the tributary signals are used as multiplexed signals of two or more low-rate signals. ### Claim 15 (depends on 14) The optical transmission and reception system according to claim 14, wherein the low-rate signals are used as 1-Gigabit Ethernet (registered trademark) signals, and the multiplexed signals are used as GFP multiplex signals. ### Claim 16 (depends on 1) The optical transmission and reception system according to claim 1, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 17 (depends on 13) The optical transmission and reception system according to claim 13, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 18 (depends on 14) The optical transmission and reception system according to claim 14, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 19 (depends on 15) The optical transmission and reception system according to claim 15, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 20 An optical transmitting and receiving apparatus for functioning as a transmitting apparatus and a receiving apparatus in an optical transmission and reception system that includes the transmitting apparatus and the receiving apparatus, the transmitting apparatus converting a plurality of tributary signals into a single beam of multilevel modulated light for transmission, the receiving apparatus receiving multilevel modulated light and converting it into a plurality of tributary signals, the optical transmitting and receiving apparatus comprising: error correction processing means for applying error correction coding processing to each individual one of the tributary signals, the error correction coding processing including addition of a tributary identifier for identifying a tributary; multilevel modulated light receiving means for receiving multilevel modulated light, separating a received signal into tributary signals, and outputting the separated signals as received tributary signals to respective different output systems; rate conversion means for performing transmission-side rate conversion by adding predetermined data to the signals given the error correction coding processing so that the signals have the same transmission rate, and performing reception-side rate conversion by deleting the predetermined data from the received tributary signals; multilevel modulation means for converting the signals given the transmission-side rate conversion into a single beam of multilevel modulated light; tributary detection means for retaining tributary identifiers defined for the respective output systems in advance as output system tributary identifiers, comparing the output system tributary identifier of each output system with the tributary identifier that extracted from the received tributary signal output to the output system, and making a notification as to a match or mismatch as a result of comparison; and tributary select means for giving an instruction to change correspondence between the received tributary signals output from the multilevel modulated light receiving means and the output systems if the result of comparison is a mismatch, the error correction processing means performing error correction decoding processing on the received tributary signals given the reception-side rate conversion and extracting the tributary identifiers from the received tributary signals or the rate-converted received tributary signals output system by output system, the multilevel modulated light receiving means changing the correspondence between the received tributary signals to output and the output systems based on the instruction from the tributary select means. ### Claim 21 An optical transmission and reception method of an optical transmission and reception system, the system including a transmitting apparatus for converting a plurality of tributary signals into a single beam of multilevel modulated light for transmission and an optical receiving apparatus whose receiving apparatus receives multilevel modulated light and converts it into a plurality of tributary signals, the method comprising: an error correction processing step of causing the transmitting apparatus to apply error correction coding processing to each individual one of the tributary signals, the error correction coding processing including addition of a tributary identifier for identifying a tributary; a transmission-side rate conversion step of causing the transmitting apparatus to perform rate conversion by adding predetermined data to the signals given the error correction coding processing so that the signals have the same transmission rate; a multilevel modulation step of causing the transmitting apparatus to convert the signals rate-converted in the transmission-side rate conversion step into a single beam of multilevel modulated light; a multilevel modulated light receiving step of causing the receiving apparatus to receive multilevel modulated light, separate a received signal into tributary signals, and output the separated signals as received tributary signals to respective different output systems; a reception-side rate conversion step of causing the receiving apparatus to perform rate conversion by deleting the predetermined data from the received tributary signals; an error correction decoding processing step of causing the receiving apparatus to perform error correction decoding processing on the received tributary signals rate-converted in the reception-side rate conversion step and extract the tributary identifiers from the received tributary signals or the rate-converted received tributary signals output system by output system; a tributary detection step of causing the receiving apparatus to retain tributary identifiers defined for the respective output systems in advance as output system tributary identifiers, compare the output system tributary identifier of each output system with the tributary identifier that is extracted from the received tributary signal output to the output system, and make a notification as to a match or mismatch as a result of comparison; a tributary select step of causing the receiving apparatus to give an instruction to change correspondence between the received tributary signals output in the multilevel modulated light receiving step and the output systems if the result of comparison is a mismatch; and an output change step of causing the receiving apparatus to change the correspondence between the received tributary signals to output and the output systems based on the instruction given in the tributary select step. ### Claim 22 (depends on 2) The optical transmission and reception system according to claim 2, wherein at least one of the tributary signals is used as an STM-64 signal, and at least one of the tributary signals is used as a 10-Gigabit Ethernet (registered trademark) signal. ### Claim 23 (depends on 2) The optical transmission and reception system according to claim 2, wherein the tributary signals are used as multiplexed signals of two or more low-rate signals. ### Claim 24 (depends on 23) The optical transmission and reception system according to claim 23, wherein the low-rate signals are used as 1-Gigabit Ethernet (registered trademark) signals, and the multiplexed signals are used as GFP multiplex signals. ### Claim 25 (depends on 2) The optical transmission and reception system according to claim 2, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 26 (depends on 22) The optical transmission and reception system according to claim 22, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 27 (depends on 23) The optical transmission and reception system according to claim 23, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier. ### Claim 28 (depends on 24) The optical transmission and reception system according to claim 24, wherein Trace Identifier Mismatch standardized by the ITU-T is used as the tributary identifier.