CN102244540A - Optical module and method for protecting optical layer - Google Patents
Optical module and method for protecting optical layer Download PDFInfo
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- CN102244540A CN102244540A CN2010101702200A CN201010170220A CN102244540A CN 102244540 A CN102244540 A CN 102244540A CN 2010101702200 A CN2010101702200 A CN 2010101702200A CN 201010170220 A CN201010170220 A CN 201010170220A CN 102244540 A CN102244540 A CN 102244540A
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Abstract
The embodiment of the invention provides an optical module and a method for protecting an optical layer. The optical module comprises a control unit, at least two light-emitting units and at least two optical receiving units, wherein the control unit is connected with an external CPU (central processing unit) and connected with the at least two light-emitting units and the at least two optical receiving units respectively; and the at least two light-emitting units and the at least two optical receiving units are connected with external optical fibers respectively. According to the embodiment of the invention, the at least two light-emitting units and the at least two optical receiving units are placed in the optical module so as to form a main transmitting channel and a standby transmitting channel as well as a main receiving channel and a standby receiving channel respectively, thus being capable of flexibly switching to the standby channels when the main channels fail, thereby realizing the flexible and low-cost protection of the optical layer.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of optical module and optical layer protective method.
Background technology
Data equipment point-to-point optical interconnection can be realized by transmission equipment or bare fiber.In order to guarantee reliability of data transmission, need carry out optical layer protective to optical link.
The scheme of existing optical layer protective can comprise following two kinds: one is, realizing by bare fiber in the scheme of optical interconnection, do optical interconnection owing to use the SFP/SFP+/XFP optical module, the corresponding optical module of light path, the corresponding interface of optical module, the optical module of many thus increase by one road interfaces and this interface correspondence and light path are as reserve link, to realize optical layer protective; Wherein, SFP is Small Form-Factor Pluggable module (Small Form-factor Pluggable optical transceiver module), SFP+ is enhancement mode SFP, and XFP is 10,000,000,000 Small Form-Factor Pluggable modules (10-Gigabit small Form-factor Pluggabletransceiver optical module).Two are: realizing by transmission equipment in the scheme of optical interconnection that the transmission equipment networking that has the optical layer protective ability by use realizes the light protection.
In realizing process of the present invention, the inventor finds: in above-mentioned first kind of scheme, increased by one road interface, and interface is an important resource more, causes thus that cost is big, cost is high; In above-mentioned second kind of scheme, need set up the transmission equipment network, such as SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) or WDM (Wavelength Division Multiplex, wavelength division multiplexing), investment is big, the maintenance cost height.
Summary of the invention
The embodiment of the invention provides a kind of optical module and optical layer protective method, with realize flexibly, optical layer protective cheaply.
The embodiment of the invention provides a kind of optical module, comprising: control unit, at least two Optical Transmit Units and at least two light receiving units;
Described control unit is connected with outer CPU, and described control unit is connected with described light receiving unit with described Optical Transmit Unit respectively;
Described Optical Transmit Unit is connected with external fiber respectively with described light receiving unit;
Described control unit be used for will receive a road first signal drive and be two-way first signal at least, and described first signal of two-way at least is transferred to described at least two Optical Transmit Units respectively; Described control unit also is used for the indication information according to described outer CPU transmission, perhaps according to described indication information and described at least two light receiving units channel status of corresponding optical channel respectively, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least, and the described secondary signal that will receive transfer to external equipment.
The embodiment of the invention provides a kind of optical layer protective method, comprising:
The indication information that control unit sends according to outer CPU, perhaps according to the channel status of the optical channel of described indication information and at least two light receiving unit correspondences, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least, and the described secondary signal that will receive transfer to external equipment by an interface on the phy chip;
A road first signal that described control unit will receive from an interface drives and is two-way first signal at least, and transmits described first signals of two-way at least by at least two Optical Transmit Units respectively.
The optical module of the embodiment of the invention and optical layer protective method; by at least two Optical Transmit Units and light receiving unit are set in optical module; form active and standby two-way transmission channel and receive path respectively; make when main road breaks down; can switch to fully road flexibly, realize flexibly, optical layer protective cheaply.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of optical module embodiment one of the present invention;
Fig. 2 is the structural representation of optical module embodiment two of the present invention;
The schematic diagram of the optical module that Fig. 3 provides for one embodiment of the invention;
Fig. 4 is the flow chart of optical layer protective method embodiment one of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the structural representation of optical module embodiment one of the present invention, as shown in Figure 1, this optical module comprises: control unit 11, at least two Optical Transmit Units (Optical Transmit Unit 21 and Optical Transmit Unit 23) and at least two light receiving units (light receiving unit 31 and light receiving unit 33).
Need to prove, light receiving unit 31 and light receiving unit 33 are all in running order, all, when guaranteeing that thus the RX signal that receives at a light receiving unit breaks down, can switch to another light receiving unit at once and receive the RX signal receiving the RX signal.
In the present embodiment, two-way light transmission channel and light-receiving passage carry out optical layer protective by being provided with at least, and the flow process that the concrete optical module that passes through in the present embodiment carries out optical layer protective is:
Road TX signal that control unit will receive drives and is two-way TX signal at least, by at least two Optical Transmit Units this TX signal is transferred out then; Control unit receives the RX signal by switch control from a light receiving unit, and the interface of this RX signal by external equipment transferred to external equipment, the receive path of this light receiving unit correspondence can be regarded main road as, wherein, can in advance these two light receiving units be set to the key light receiving element respectively and be equipped with light receiving unit, the optical channel of key light receiving element correspondence is a main optical path, the optical channel that is equipped with the light receiving unit correspondence is for being equipped with optical channel, control unit preferentially receives the RX signal from the key light receiving element, and promptly control unit preferentially receives the RX signal from main optical path;
The indication information that control unit sends according to outer CPU, perhaps according to the indication information of outer CPU transmission and the channel status of optical channel, switching to fully from the key light receiving element, light receiving unit receives the RX signal, wherein, the judgement main body of light receiving unit can be an outer CPU to judge whether to switch to fully from the key light receiving element, also can be outer CPU and control unit; When the indication information that sends according to outer CPU switches, the channel status information of the main optical path that outer CPU reception control unit sends and other unit are (for example: the detection information of Fa Songing physical chip), to judge the channel status information of main optical path unusual or judge detection information that other unit send when unusual when outer CPU, outer CPU is judged main optical path and is broken down, then send indication information to control unit, switching to fully with the indication control unit, light receiving unit receives the RX signal; When the channel status of indication information that sends according to outer CPU and optical channel is switched, if it is unusual that control unit detects the channel status of main optical path, then can directly judge and switch to fully that light receiving unit receives the RX signal, if the channel status of main optical path is normal, but receive outer CPU when indication information that control unit sends, control unit switches to also fully that light receiving unit receives the RX signal.
Control unit switches to light receiving unit fully by switch, to receive the RX signal by being equipped with light receiving unit, has realized optical layer protective by active and standby two-way thus.
The embodiment of the invention forms active and standby two-way transmission channel and receive path respectively by at least two Optical Transmit Units and light receiving unit are set in optical module, make when main road breaks down, and can switch to road fully flexibly; The embodiment of the invention need not to increase the interface of external equipment; only existing optical module is just improved and to realize optical layer protective; and improved difficulty of optical module and complexity be far below the difficulty and the complexity that increase external apparatus interface, thus the embodiment of the invention realized flexibly, optical layer protective cheaply.
Fig. 2 is the structural representation of optical module embodiment two of the present invention, and on the basis of optical module embodiment one, as shown in Figure 2, control unit 11 can comprise: controller 111, memory 113, transducer 115 and selector switch 117.
Present embodiment is provided with at least two light receiving units and at least two Optical Transmit Units in optical module, at least two light receiving units, set in advance one and be the key light receiving element, and other are for being equipped with light receiving unit; The optical channel of key light receiving element correspondence is a main optical path, and the optical channel that is equipped with the light receiving unit correspondence is for being equipped with optical channel.Under normal condition, controller is selected the main optical path receiving optical signals by selector switch, take place when unusual when outer CPU detects main optical path, this CPU controls selector switch by controller, makes to switch to fully from main optical path by selector switch optical channel comes receiving optical signals; Perhaps take place when unusual when controller detects main optical path, controller switches to fully by selector switch from main optical path that optical channel comes receiving optical signals.When being equipped with light receiving unit and corresponding when being equipped with optical channel more than one, controller by selector switch from one of them receiving optical signals.Wherein, outer CPU detects the unusual situation of main optical path generation and can comprise: controller sends to outer CPU with the channel status of detected main optical path, and outer CPU is unusual by judging that channel status knows that main optical path takes place; Perhaps, outer CPU receives the detection signal that other unit (other unit except optical module) send, the signal of telecommunication of this main optical path correspondence that for example electric module sends, outer CPU detect this signal of telecommunication when unusual, and it is unusual also can to judge this main optical path.
The volume of optical module is less, in order in optical module, to increase standby light receiving unit and Optical Transmit Unit, need to adopt the optical device and the electronic switch of as far as possible little encapsulation, and under the prerequisite of compatible SFP/SFP+/XFP cage, and do not influence under the prerequisite of plug and rack fiber, optical module length can suitably extend, wherein, cage is meant the device of fixed light module, and profile and cage are similar, so be commonly referred to as cage.
In order in the less optical module of volume, to realize out at least 4 tail optical fibers, can will stretch out outside the body of optical module with the optical fiber that each light emission component and optical fiber receive module are connected one to one respectively, the end that these optical fiber stretch out the optical module body is connected with optical fiber interface; Promptly can adopt the method for direct whipping fibre to be implemented in the optical module of small size and go out at least 4 tail optical fibers.
In order in the less optical module of volume, to realize out at least 4 tail optical fibers, can also adopt MPO (Multi-Fiber Push-On, the multipath optical transmission) scheme, for example: the output of each Optical Transmit Unit links to each other with external fiber by the MPO interface with the input of light receiving unit, be specifically as follows: each light emission component links to each other with external fiber by the MPO interface with optical fiber receive module, and this MPO interface can be 4 cores or 8 cores.
Specifically describe the method flow that the optical module that uses present embodiment to provide carries out optical layer protective below in conjunction with Fig. 3; the schematic diagram of the optical module that Fig. 3 provides for one embodiment of the invention; wherein; controller is example with MCU; transducer and selector switch are example with first electric switch and second electric switch respectively; memory is example with EEPEOM; laser driver 211 and laser driver 231 are example with LDD1 and LDD2 respectively; amplifier 311 and amplifier 331 are example with LA1 and LA2 respectively; light emission component 213 and light emission component 233 are example with TOSA1 and TOSA2 respectively; optical fiber receive module 313 and optical fiber receive module 333 are example with ROSA1 and ROSA2 respectively, and concrete optical layer protective flow process is:
MCU controls the two-way of first electric switch and opens simultaneously, promptly first electric switch drives one road TX signal of telecommunication and is the two-way TX signal of telecommunication, and this two-way TX signal of telecommunication is transferred to LDD1 and LDD2 respectively, by LDD1 and LDD2 is respectively the TX light signal that TOSA can discern with the TX electrical signal conversion, and two-way TX light signal is transferred to TOSA1 and TOSA2 respectively, respectively two-way TX optical signal transmission is carried out optical communication to external fiber by TOSA1 and TOSA2; Wherein, first electric switch has two opens function, and the work of overall optical modular system is in the pattern of dual transmitting and receiving;
Second electric switch is subjected to MCU control, and when not switching, second electric switch receives RX signal (for example the optical channel of LA1 and ROSA1 correspondence is a main optical path, and the optical channel of LA2 and ROSA2 correspondence is for being equipped with optical channel) from LA1 and ROSA1; LA1 is converted to the RX signal of telecommunication with the RX light signal that ROSA1 receives, and by second electric switch RX signal of telecommunication is transferred to external equipment then;
MCU contacts with LA1, ROSA1 and LA2, ROSA2 respectively, MCU real-time or timing detection main optical path and the state that is equipped with optical channel, MCU can determine whether main optical path normally also can determine the availability of optical channel fully according to testing result, MCU with detected main optical path and the state storage that is equipped with optical channel in EEPEOM, so that outer CPU obtains main optical path by the I2C interface and is equipped with the state information of optical channel; When main optical path takes place when unusual, MCU can detect main optical path los (dropout, loss of signal) signal;
After MCU detects main optical path los signal, MCU judges main optical path by detection and breaks down, and control second electric switch and switch, perhaps, when outer CPU was judged main optical path and broken down, outer CPU sent indication information to MCU, switches so that MCU controls second electric switch, switch to optical channel fully from main optical path, promptly receive the RX signal by LA2 and ROSA2; Wherein, outer CPU judges that process that main optical path breaks down can receive the state information of the main optical path that MCU sends according to the query requests of outer CPU for: outer CPU, perhaps outer CPU receives the detection information that other unit send, and outer CPU judges that according to above-mentioned state information or detection information main optical path breaks down.Thus, takes place when unusual, can control electric switch and switch to optical channel fully, and it is lower to transform the cost of optical module at main optical path, realized low-cost, carry out optical layer protective flexibly.
In the flow process of above-mentioned optical layer protective, if when main optical path breaks down, it is also unusual that outer CPU or MCU detect the state of current optical channel fully, when promptly detecting the los signal that is equipped with optical channel, then reports warning and forbid active and standby switching.Outer CPU or MCU also can regularly inquire about the fully state of optical channel, when detecting that optical channel is unusual fully, report warning and forbid active and standby switching, so that operating personnel are known the state of active and standby optical channel timely.
In the embodiment of the invention, a main optical path and a plurality of alternate channel can be arranged, not limit the quantity of alternate channel, promptly not limit the Optical Transmit Unit and the quantity of light receiving unit fully fully at this.
The optical module of the embodiment of the invention by in an optical module active and standby path being set, makes when primary path breaks down, and can carry out the switching of active and standby path by electric switch, and detects the availability of primary channel in real time, guarantees the reliability of active and standby switching; And in an optical module, the failure rate of MCU and EEPROM is very low, and the optical device that easily lost efficacy is independent of each other, so the inefficacy of single channel passage is very little to the influence of another paths, has improved the reliability of optical layer protective thus; And present embodiment also need not to increase the interface of transmission equipment and external equipment, gets final product and only optical module is improved cheaply; Thus the optical module that provides of the embodiment of the invention can realize flexibly, optical layer protective cheaply.
Fig. 4 is the flow chart of optical layer protective method embodiment one of the present invention, and as shown in Figure 4, this method comprises:
The indication information that step 401, control unit send according to outer CPU, perhaps according to the channel status of the optical channel of indication information and at least two light receiving unit correspondences, from at least two light receiving units, select a light receiving unit to be used to receive secondary signal, and the secondary signal that receives is transferred to external equipment by an interface on the phy chip.
Control unit receives the RX signal by switch control from a light receiving unit, and this RX signal transferred to external equipment by the same physical interface on the same phy chip, this light receiving unit is the key light receiving element, the optical channel of key light receiving element correspondence can be regarded main road, i.e. main optical path as.
When main optical path broke down, control unit can switch to another light receiving unit by switch and receive the RX signal, can realize optical layer protective by active and standby two-way thus; This another light receiving unit is for being equipped with light receiving unit, and the optical channel that is equipped with the light receiving unit correspondence can be regarded road fully as, promptly is equipped with optical channel, and this handoff procedure specifically can comprise:
When control unit received the indication information of outer CPU transmission, control unit switched to light receiving unit reception RX signal fully from the key light receiving element; This situation can be to switch according to the indication information that outer CPU sends;
Perhaps, when control unit receives the channel status of the optical channel that indication information that outer CPU sends or control unit detect key light receiving element correspondence when unusual, control unit switches to fully from the key light receiving element that light receiving unit receives TX information; This situation can be to switch according to the indication information of outer CPU transmission or according to the state information of main optical path.
Wherein, control unit, at least two light receiving units and at least two Optical Transmit Units are positioned at optical module inside.
The two-way of the electric switch that control unit control is connected with Optical Transmit Unit is opened simultaneously, promptly the road TX signal that receives from a physical interface is driven to two-way TX signal by this electric switch, by two Optical Transmit Units this two-way TX signal is transferred out then.
Present embodiment does not limit the execution sequence of step 401 and step 402.
The optical module that present embodiment uses above-mentioned present embodiment to provide carries out optical layer protective, and concrete method flow can be referring to the description in the various embodiments described above.
The embodiment of the invention, at least two Optical Transmit Units and light receiving unit by being provided with in the optical module form active and standby two-way transmission channel and receive path respectively, make when main road breaks down, and can switch to road fully flexibly; The embodiment of the invention need not to increase the interface of external equipment; only existing optical module is just improved and to realize optical layer protective; and improved difficulty of optical module and complexity be far below the difficulty and the complexity that increase external apparatus interface, thus the embodiment of the invention realized flexibly, optical layer protective cheaply.
The embodiment of the invention also provides a kind of optical layer protective method, and on the basis of method embodiment one, at least two light receiving units comprise that a key light receiving element and at least one are equipped with light receiving unit, and control unit comprises: controller, transducer and selector switch; This method comprises:
Road first signal that control unit will receive drives and is two-way first signal at least, is specially: controller is by the control transformation device, makes a road first signal driving that transducer will receive be two-way first signal at least;
Control unit receives secondary signal from the key light receiving element, and the channel status of the optical channel of control unit detection of dynamic light receiving unit correspondence;
When the channel status of the optical channel of key light receiving element correspondence unusual, and current control unit to detect the optical channel state of light receiving unit correspondence fully normal, then control unit switches to and is equipped with light receiving unit from one and receives second information; Concrete, control unit switches to from being equipped with light receiving unit and receives second information and comprise: the indication information that controller sends according to outer CPU, perhaps the indication information that sends according to outer CPU and the channel status control selector switch of optical channel receive second information from being equipped with light receiving unit.When being equipped with light receiving unit, therefrom select one to be equipped with light receiving unit and to receive second information more than one.
Wherein, the flow process of optical layer protective method can be carried out the method flow description of optical layer protective referring to the use optical module in the various embodiments described above in the present embodiment, does not repeat them here.
The embodiment of the invention, the active and standby path by being provided with in the optical module makes when main road breaks down, and can carry out the switching of active and standby path by the software control electric switch, and detects the availability that is equipped with optical channel in real time, guarantees the reliability of active and standby switching; And in an optical module, the failure rate of MCU and EEPROM is very low, and the optical device that easily lost efficacy is independent of each other, so the inefficacy of single channel passage is very little to the influence of another paths, has improved the reliability of optical layer protective thus; And present embodiment also need not to increase transmission equipment.So the method that the embodiment of the invention provides can realize flexibly, optical layer protective cheaply.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. an optical module is characterized in that, comprising: control unit, at least two Optical Transmit Units and at least two light receiving units;
Described control unit is connected with outer CPU, and described control unit is connected with described light receiving unit with described Optical Transmit Unit respectively;
Described Optical Transmit Unit is connected with external fiber respectively with described light receiving unit;
Described control unit be used for will receive a road first signal drive and be two-way first signal at least, and described first signal of two-way at least is transferred to described at least two Optical Transmit Units respectively; Described control unit also is used for the indication information according to described outer CPU transmission, perhaps according to described indication information and described at least two light receiving units channel status of corresponding optical channel respectively, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least, and the described secondary signal that will receive transfer to external equipment.
2. optical module according to claim 1 is characterized in that, described control unit comprises: controller, transducer and selector switch;
Described controller is connected with described outer CPU, described transducer, described selector switch and described two light receiving units respectively at least; Described controller is used to obtain described at least two light receiving units channel status of corresponding optical channel respectively; Described controller also is used for the indication information according to described outer CPU transmission, perhaps, control described selector switch and from described two light receiving units, select a described light receiving unit to be used to receive secondary signal at least according to described indication information and described optical channel state;
Described transducer is connected with the input of described two Optical Transmit Units respectively at least, and described one tunnel first signal that is used for receiving drives and is described first signal of two-way at least; Described selector switch is connected with the output of described two light receiving units respectively at least.
3. optical module according to claim 1 and 2, it is characterized in that, stretch out outside the body of described optical module with the optical fiber that the input of the output of described Optical Transmit Unit and described light receiving unit is connected one to one respectively, the end that described optical fiber stretches out described optical module body is connected with optical fiber interface.
4. optical module according to claim 1 and 2 is characterized in that, the output of described Optical Transmit Unit links to each other with external fiber by the MPO interface with the input of described light receiving unit.
5. an optical layer protective method is characterized in that, comprising:
The indication information that control unit sends according to outer CPU, perhaps according to the channel status of the optical channel of described indication information and at least two light receiving unit correspondences, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least, and the described secondary signal that will receive transfer to external equipment by an interface on the phy chip;
A road first signal that described control unit will receive from an interface drives and is two-way first signal at least, and transmits described first signals of two-way at least by at least two Optical Transmit Units respectively.
6. optical layer protective method according to claim 5; it is characterized in that; described at least two light receiving units comprise that a key light receiving element and at least one are equipped with light receiving unit; the indication information that described control unit sends according to outer CPU; perhaps, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least and comprise according to the channel status of the optical channel of described indication information and at least two light receiving unit correspondences:
Described control unit receives described secondary signal from described key light receiving element;
When described control unit received described indication information, described control unit switched to a described light receiving unit that is equipped with from described key light receiving element and receives described secondary signal.
7. optical layer protective method according to claim 5; it is characterized in that; described at least two light receiving units comprise that a key light receiving element and at least one are equipped with light receiving unit; the indication information that described control unit sends according to outer CPU; perhaps, from described two light receiving units, select a light receiving unit to be used to receive secondary signal at least and comprise according to the channel status of the optical channel of described indication information and at least two light receiving unit correspondences:
Described control unit receives described secondary signal from described key light receiving element;
Detect the channel status of optical channel of described key light receiving element correspondence when unusual when described control unit receives described indication information or described control unit, described control unit switches to a described light receiving unit that is equipped with from described key light receiving element and receives described second information.
8. according to claim 6 or 7 described optical layer protective methods, it is characterized in that described control unit comprises: controller and selector switch; Described control unit switches to a described light receiving unit that is equipped with from described key light receiving element and receives described second information and comprise:
Described controller, is controlled described selector switch and is received described second information from a described light receiving unit that is equipped with perhaps according to described indication information and described channel status according to described indication information.
9. optical layer protective method according to claim 8 is characterized in that described control unit also comprises transducer; A road first signal that described control unit will receive from an interface drives to two-way first signal at least and comprises:
Described controller will drive described transducer from described one tunnel first signal that an interface receives and is described first signal of two-way at least by the described transducer of control.
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| CN2010101702200A CN102244540A (en) | 2010-05-11 | 2010-05-11 | Optical module and method for protecting optical layer |
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| CN2010101702200A CN102244540A (en) | 2010-05-11 | 2010-05-11 | Optical module and method for protecting optical layer |
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| CN105071853A (en) * | 2015-08-28 | 2015-11-18 | 武汉东方光昇科技有限公司 | Backup link based optical communication system and method |
| CN105763245A (en) * | 2014-12-18 | 2016-07-13 | 中兴通讯股份有限公司 | Optical transceiving module |
| WO2020244632A1 (en) * | 2019-06-06 | 2020-12-10 | 中国移动通信有限公司研究院 | Sending methof and receiving method for connection information, optical module and central processing device |
| CN113452446A (en) * | 2021-06-22 | 2021-09-28 | 青岛海信宽带多媒体技术有限公司 | Optical module and channel switching method |
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| CN104426598B (en) * | 2013-08-20 | 2018-07-13 | 上海斐讯数据通信技术有限公司 | The SFP protection switching devices and method of OLT |
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Application publication date: 20111116 |