CN201682594U - Optical line terminal of gigabit passive light network - Google Patents
Optical line terminal of gigabit passive light network Download PDFInfo
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- CN201682594U CN201682594U CN2009202409718U CN200920240971U CN201682594U CN 201682594 U CN201682594 U CN 201682594U CN 2009202409718 U CN2009202409718 U CN 2009202409718U CN 200920240971 U CN200920240971 U CN 200920240971U CN 201682594 U CN201682594 U CN 201682594U
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- data recovery
- clock data
- line terminal
- recovery circuit
- reset
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Abstract
The utility model discloses an optical line terminal (OLT) of gigabit passive light network, comprising a light module, a clock data recovery circuit and a reset circuit, wherein the electric signal output end of the light module is connected to the signal input end of the clock data recovery circuit via a matching capacitor, the output end of the reset circuit is arranged on the connecting line between the matching capacitor and the signal input end of the clock data recovery circuit, and the input end of the reset circuit is connected to the reset signal input end. When a reset signal is received, residual signals on the input end of the clock data recovery circuit are cleared up, so as to solve the matching problem between the light module and clock data recovery circuit, accelerate the reset of bursting receive data and increase the GPON performance.
Description
Technical field
The utility model relates to the optical communication technique field, specifically, relates to a kind of optical line terminal of gigabit passive optical network, more specifically, relates in the described optical line terminal burst be received the structure that data reset.
Background technology
Gigabit passive optical network (GPON) is because its networking mode, bandwidth availability ratio and digital easily network management function and be subjected to the favor of telecom operators more and more efficiently flexibly, at present, this kind networking mode has been widely used in areas such as North America and Europe, the domestic in recent years pace of construction that also quickens the GPON network.In order to satisfy optical-fiber network of future generation to two-forty, big capacity, multiple services demand, the asymmetric EPON (Asymmetrical 10GGPON) of ten gigabit capacity of future generation has appearred at present on the market, the bandwidth of its down link has been brought up to 10.3125Gb/s, and up link has also been brought up to 2.5Gb/s.In 1 minute 128 tunnel system, the transmission range of this network can reach 20km.This provides strong technical support for the broadband services of develop rapidly.
With 10G GPON system is example, clock data recovery circuit (CDR) in the optical line terminal (OLT) is for the performance that directly influences whole system recovery time of uplink burst signal, therefore, the matching problem between CDR input interface and the optical module output interface is most important.The used chip of the CDR that can support 2.5Gb/s burst to receive at present is few in number, and its input interface adopts the mode of similar electric current common mode logic level (CML) mostly; And the output level of industry 10G GPON OLT optical module does not have unified standard yet at present, and most of producers adopt low-power consumption positive emitter coupling logic level (LVPECL), and just there is the matching problem of varying level standard between an optical module and the CDR in this.
At above-mentioned CDR that in the OLT of GPON system, exists and the matching problem between the optical module, if adopt the direct current coupling, not only difficulty is bigger, and because the difference of the structure of chip used between the two interface inside, cause in some application scenarios, can't realizing that the direct current mode mates, thereby limited the raising of GPON systematic function.
Summary of the invention
Problem in the optical module that the utility model exists at the optical line terminal of GPON system in the prior art and the level match of clock data recovery circuit existence, a kind of optical line terminal of gigabit passive optical network is provided, solved the mutual matching problem of optical module and clock data recovery circuit, and accelerated the recovery time of burst reception data, improved the performance of GPON system.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of optical line terminal of gigabit passive optical network comprises optical module and clock data recovery circuit, and the electrical signal of described optical module is connected with the signal input part of described clock data recovery circuit by matching capacitance; Described optical line terminal also includes reset circuit, its output is connected on the connecting line between the signal input part of described matching capacitance and described clock data recovery circuit, its input connects the reset signal input, when receiving reset signal, remove the residue signal on the described clock data recovery circuit signal input part.
According to the utility model, described reset circuit can be arranged between described optical module and the described clock data recovery circuit, is independent of described optical module and described clock data recovery circuit; It is inner or be integrated between the described clock data recovery circuit also can be integrated in described optical module, to reduce system bulk, the simplified system layout.
According to the utility model, for simplifying circuit structure, described reset circuit comprises the chip that resets, the input of the described chip that resets connects the reset signal input of optical line terminal, and its output is connected on the connecting line between the signal input part of described matching capacitance and described clock data recovery circuit.
Wherein, described reset signal is sent by the mac controller in the optical line terminal, does not need extra circuits to produce described reset signal.
According to the utility model, the signal of telecommunication of described optical module output is a differential voltage signal, is connected with the differential signal input of described clock data recovery circuit by a matching capacitance respectively.
Especially, gigabit passive optical network described in the utility model is 10G GPON.
Compared with prior art, advantage of the present utility model and good effect are: on the one hand, by exchanging level match between optical module and the clock data recovery circuit matching capacitance being set, solved the matching problem between the output level of the incoming level of clock data recovery circuit and optical module well, and applicable to the coupling between the level of arbitrary form; On the other hand, by between described matching capacitance and described clock data recovery circuit, setting up reset circuit, can accelerate to happen suddenly receives the recovery time of data, has remedied because of matching capacitance discharges and recharges elongated problem recovery time that causes, and improves the ascending performance of GPON system.
Description of drawings
Fig. 1 is the theory diagram of an embodiment of optical line terminal of the utility model gigabit passive optical network.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
The optical line terminal of gigabit passive optical network described in the utility model is for the mutual coupling between the incoming level of the output level of realizing optical module easily and system clock data recovery circuit, between optical module and clock data recovery circuit, add electric capacity and exchange level match, implementation method is simple, and can realize the coupling between any level.
Owing to introduced matching capacitance, the discharging and recharging the reception recovery time that effect can influence uplink data significantly of electric capacity, thus directly have influence on the ascending performance of gigabit passive optical network.For this reason, the utility model is provided with a reset circuit between described matching capacitance and described clock data recovery circuit, and the reset signal of the input drawing-in system by reset circuit, described reset signal are the notification signals that next data arrives.When reset circuit receives this reset signal, in time remove the residue signal level on the clock data recovery circuit input, to guarantee accurate reception to next bursty data.
Figure 1 shows that the theory diagram of an embodiment of the utility model.
This embodiment is an example with 10G GPON, in 10G GPON optical line terminal, include optical module and clock data recovery circuit, the output level of described optical module is low-power consumption positive emitter coupling logic level LVPECL, and the incoming level of described clock data recovery circuit is common mode logic level CML.
The differential voltage signal output of described optical module is connected with matching capacitance C1 and matching capacitance C2 respectively, on the connecting line between the differential signal input RD-of described capacitor C 1 and described clock data recovery circuit and the connecting line between the differential signal input RD+ of described capacitor C 2 and described clock data recovery circuit be provided with reset circuit.
The output of described reset circuit is connected on the connecting line between the differential signal input of described matching capacitance C1, C2 and described clock data recovery circuit, and its input is connected with reset signal input RX_RST, and described reset signal input RX_RST is also by a drop-down resistance R ground connection.Described reset signal can be the signal that is sent by the mac controller in the optical line terminal.
In optical module inside, the uplink optical signal that receives by optical assembly is converted into the signal of telecommunication, be input to the input of amplitude limiting amplifier circuit then, export by the differential voltage signal output of optical module through the signal that amplitude limiting amplifier circuit carries out after amplitude limit amplifies, and then exchange coupling with C2 through described matching capacitance C1, transfer to described clock data recovery circuit by the differential signal input.
Reset circuit is when the reset signal that the system mac controller of receiving sends, remove the residue signal level on the described clock data recovery circuit input fast, accelerate the recovery time of bursty data, to guarantee accurate reception to next bursty data, thereby remedy the prolongation of the recovery time of causing, guaranteed that 10G GPON photosystem is to the high speed of uplink data, reception accurately because of discharging and recharging of matching capacitance.
Described reset circuit can adopt the version of the reset circuit that is used for GPON system optical module inside in the prior art.Be to simplify circuit structure, described reset circuit also can adopt special use reset chip and its peripheral circuit composition, and the described special use chip that resets can adopt the chip of models such as 3305 of TI company to realize.
In this embodiment, described reset circuit can be arranged between described optical module and the described clock data recovery circuit, is independent of described optical module and described clock data recovery circuit; It is inner or be integrated between the described clock data recovery circuit also can be integrated in described optical module, to reduce system bulk, the simplified system layout.
Use the optical line terminal of gigabit passive optical network described in the utility model, not only can solve the matching problem between optical module output level and the clock data recovery circuit incoming level well, can also accelerate to happen suddenly and receive the recovery time of data, the high speed that has guaranteed the optical network system uplink data receives, and has improved the overall performance of optical network system.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1. the optical line terminal of a gigabit passive optical network comprises optical module and clock data recovery circuit, it is characterized in that, the electrical signal of described optical module is connected with the signal input part of described clock data recovery circuit by matching capacitance; Described optical line terminal also includes reset circuit, its output is connected on the connecting line between the signal input part of described matching capacitance and described clock data recovery circuit, its input connects the reset signal input, when receiving reset signal, remove the residue signal on the described clock data recovery circuit signal input part.
2. the optical line terminal of gigabit passive optical network according to claim 1 is characterized in that, described reset circuit is arranged between described optical module and the described clock data recovery circuit.
3. the optical line terminal of gigabit passive optical network according to claim 1 is characterized in that, described reset circuit is integrated in described optical module inside.
4. the optical line terminal of gigabit passive optical network according to claim 1 is characterized in that, described reset circuit is integrated between the described clock data recovery circuit.
5. according to the optical line terminal of each described gigabit passive optical network in the claim 1 to 4, it is characterized in that, described reset circuit comprises the chip that resets, the input of the described chip that resets connects the reset signal input of optical line terminal, and its output is connected on the connecting line between the signal input part of described matching capacitance and described clock data recovery circuit.
6. the optical line terminal of gigabit passive optical network according to claim 5 is characterized in that, described reset signal is sent by the mac controller in the optical line terminal.
7. the optical line terminal of gigabit passive optical network according to claim 1, it is characterized in that, the signal of telecommunication of described optical module output is a differential voltage signal, is connected with the differential signal input of described clock data recovery circuit by a matching capacitance respectively.
8. the optical line terminal of gigabit passive optical network according to claim 1 is characterized in that, described gigabit passive optical network is 10G GPON.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202409718U CN201682594U (en) | 2009-11-02 | 2009-11-02 | Optical line terminal of gigabit passive light network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202409718U CN201682594U (en) | 2009-11-02 | 2009-11-02 | Optical line terminal of gigabit passive light network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201682594U true CN201682594U (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202409718U Expired - Lifetime CN201682594U (en) | 2009-11-02 | 2009-11-02 | Optical line terminal of gigabit passive light network |
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| CN (1) | CN201682594U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437881A (en) * | 2011-10-14 | 2012-05-02 | 成都优博创技术有限公司 | Receiving state recovery device for optical line terminal (OLT) optical module |
| CN104618052A (en) * | 2015-03-09 | 2015-05-13 | 深圳市共进电子股份有限公司 | Gibabit-Capable (GPON) optical line terminal (OLT) light module interface circuit |
-
2009
- 2009-11-02 CN CN2009202409718U patent/CN201682594U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437881A (en) * | 2011-10-14 | 2012-05-02 | 成都优博创技术有限公司 | Receiving state recovery device for optical line terminal (OLT) optical module |
| CN102437881B (en) * | 2011-10-14 | 2016-04-27 | 成都优博创技术有限公司 | A kind of accepting state recovery device for OLT optical module |
| CN104618052A (en) * | 2015-03-09 | 2015-05-13 | 深圳市共进电子股份有限公司 | Gibabit-Capable (GPON) optical line terminal (OLT) light module interface circuit |
| CN104618052B (en) * | 2015-03-09 | 2017-08-04 | 深圳市共进电子股份有限公司 | A kind of interface circuit of GPON OLT optical modules |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101222 |