CN202374268U - OLT (Optical Line Terminal) module optical power detection circuit - Google Patents
OLT (Optical Line Terminal) module optical power detection circuit Download PDFInfo
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- CN202374268U CN202374268U CN2011205577553U CN201120557755U CN202374268U CN 202374268 U CN202374268 U CN 202374268U CN 2011205577553 U CN2011205577553 U CN 2011205577553U CN 201120557755 U CN201120557755 U CN 201120557755U CN 202374268 U CN202374268 U CN 202374268U
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Abstract
The utility model provides an OLT (Optical Line Terminal) module optical power detection circuit which comprises a PD (Photodiode), a current mirror device, a booster, a sampling retainer and a current increasing circuit, wherein the PD is used for receiving an uplink optical signal; the current mirror device comprises an input end and first and second current output ends; a cathode of the PD is connected with the first current output end; an anode of the PD is connected with a TIA (Totally Integrated Automation) amplifier; the booster is connected with the input end of the current mirror device; an input end of the sampling retainer is connected with the second current output end of the current mirror device; an output end of the sampling retainer is connected with an AD (Analog to Digital) converter; a first end of the current increasing circuit is connected with the cathode of the PD; and a second end of the current increasing circuit is grounded. Due to the arrangement of the current increasing circuit, the proportion of effective values in AD sampling values is high, so that the errors generated during the detection to a small optical power can be reduced.
Description
Technical field
The utility model relates to the optical line terminal integrated module of optical transceiver (the Optical Line Terminal Transceiver in passive optical network PON (the Passive Optical Network) system; Hereinafter to be referred as the OLT module), relate in particular to a kind of OLT module luminous power testing circuit.
Background technology
In the PON system; The OLT module is on the one hand to ONU transmitting downstream light signal; Receive uplink optical signal on the other hand, and report luminous power and the expanded function (as: luminous power alarm) thereof that receives to network system from optical network unit ONU (Optical Network Unit).But because the circuit substrate space finite sum cost factor of OLT module, luminous power can not adopt the such complicated element circuit of similar light power meter when detecting.The luminous power testing circuit of an existing OLT module often photoelectric current with photodiode passes through current mirror device and the big or small voltage signal of sampling retainer output sign luminous power; Convert thereof into digital signal by analog to digital converter then, thereby obtain the luminous power size.This luminous power testing circuit is owing to exist inevitable modulus sampling noiset; When the input optical power of OLT module during less than-25 dBm (3.16uW); The modulus sampled value is little and shake is big; Make the shared proportion of modulus effective value little and unstable, this has just caused when detecting little luminous power and has had very large error, especially when detecting burst.
Summary of the invention
For overcoming above shortcoming, the utility model provides the OLT module luminous power testing circuit of the high detection luminous power of a kind of accuracy of detection.
For reaching above goal of the invention, the utility model provides a kind of OLT module luminous power testing circuit, and comprising: one is used to receive the PD photodiode of uplink optical signal; One current mirror device comprises an input, first, second current output terminal, and said PD photodiode cathode connects this first current output terminal, and anode connects a TIA amplifier; One stepup transformer connects said current mirror device input; One sampling retainer, its input connects said current mirror device second current output terminal, and its output connects an AD analog to digital converter, also comprises an incremental circuit, and its first end is connected with said PD photodiode cathode, the second end ground connection.
Said PD photodiode can be PIN or APD photodiode.
Said incremental circuit can adopt an incremental resistance or a constant-current source.
The incremental current value range of said incremental circuit is 10uA ~ 1000uA.
Owing to be provided with incremental circuit in the above-mentioned OLT module luminous power testing circuit, the output voltage of sampling retainer is also correspondingly increased, the AD sampled value also increases thereupon.When the OLT module receives up luminous power hour, as-25dBm～-during 30dBm, the effective value proportion in the AD sampled value is still bigger, detecting little luminous power time error will reduce.
Description of drawings
Fig. 1 representes the utility model OLT module luminous power testing circuit block diagram.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
OLT module luminous power testing circuit as shown in Figure 1 comprises: one is used to receive the PD photodiode 10 of uplink optical signal, and this photodiode can be PIN or APD photodiode.One current mirror device 20 comprises an input 21, first, second current output terminal 22,23, and PD photodiode 10 negative electrodes connect this first current output terminal 22, and anode connects a TIA amplifier; One stepup transformer 30 connects current mirror device 20 inputs 21; One sampling retainer 40, its input connects current mirror device 20 second current output terminals 23, and its output connects an AD analog to digital converter 50, also comprises an incremental circuit 60, and its first end is connected with PD photodiode 10 negative electrodes, the second end ground connection.Incremental circuit 60 adopts other modes such as an incremental resistance R or a constant-current source to realize in the present embodiment.
Operation principle explanation: it is the input 21 that tens volts of direct currents export current mirror device 20 to that stepup transformer 30 boosts 3.3 volts or 5 volts of DC power supplys, passes through its first current output terminal 22 output current I again
22To PD photodiode 10 photoelectric current Ipd and incremental circuit 60 incremental electric current I r.PD photodiode 10 is under certain specified reverse bias voltage effect, and its photoelectric current Ipd and input optical power Pi (1mW below) are proportional, i.e. Ipd=Pi*C, and wherein C is expressed as the responsiveness constant of PD photodiode 10.Sampling retainer 40 obtains the AD modulus sampled value corresponding with PD photodiode 10 input optical power Pi through current mirror device 20 sampling output voltage to AD analog to digital converters 50 are carried out analog-to-digital conversion.Again through several known input optical powers being carried out AD modulus sampling, thereby obtain the functional relation of input optical power Pi and AD modulus sampled value.Current mirror device 20 first current output terminals 22 output current I
22With first current output terminal, 23 output current I
23Relation in direct ratio: I
22=I
23* n, wherein n is the natural number more than or equal to 1, and I
22=Ipd+Ir.Because the existence of incremental electric current I r is arranged; When even photoelectric current Ipd is minimum, as luminous power Pi be-25dBm～-30dBm, the AD sampled value is still enough big; Effective value proportion in the AD sampled value is bigger; The influence of AD sampling noiset is small, and it is minimum to detect PD photodiode 10 input optical power Pi time errors, and precision is high.For example: at PD photodiode 10 input optical power Pi be-during 30dBm, about 116 (AD sampled value full scale is 4095) of AD sampled value.Experiment showed, when PD photodiode 10 input optical power Pi for-6dBm～-during 25dBm, detect PD photodiode 10 input optical power Pi errors less than ± 0.3dBm; When luminous power be-25dBm～-during 30dBm, detect PD photodiode 10 input optical power Pi errors less than ± 0.5dBm, all can finely satisfy requirement in the optical fiber communication network equipment.
Claims (4)
1. OLT module luminous power testing circuit, comprising: one is used to receive the PD photodiode (10) of uplink optical signal; One current mirror device (20) comprises an input (21), first, second current output terminal (22,23), and said PD photodiode (10) negative electrode connects this first current output terminal (22), and anode connects a TIA amplifier; One stepup transformer (30) connects said current mirror device (20) input (21); One sampling retainer (40); Its input connects said current mirror device (20) second current output terminals (23); Its output connects an AD analog to digital converter (50), it is characterized in that, also comprises an incremental circuit (60); Its first end is connected the second end ground connection with said PD photodiode (10) negative electrode.
2. OLT module luminous power testing circuit according to claim 1 is characterized in that said PD photodiode (10) can be PIN or APD photodiode.
3. OLT module luminous power testing circuit according to claim 2 is characterized in that said incremental circuit (60) can adopt an incremental resistance or a constant-current source.
4. OLT module luminous power testing circuit according to claim 3 is characterized in that the current value range of said incremental circuit (60) is 10uA ~ 1000uA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205577553U CN202374268U (en) | 2011-12-28 | 2011-12-28 | OLT (Optical Line Terminal) module optical power detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205577553U CN202374268U (en) | 2011-12-28 | 2011-12-28 | OLT (Optical Line Terminal) module optical power detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202374268U true CN202374268U (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205577553U Expired - Lifetime CN202374268U (en) | 2011-12-28 | 2011-12-28 | OLT (Optical Line Terminal) module optical power detection circuit |
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| Country | Link |
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| CN (1) | CN202374268U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188012A (en) * | 2011-12-28 | 2013-07-03 | 深圳新飞通光电子技术有限公司 | Optical power detection circuit for OLT module |
| CN103259591A (en) * | 2013-04-24 | 2013-08-21 | 深圳市极致兴通科技有限公司 | GPON OLT module RSSI fast sampling circuit |
-
2011
- 2011-12-28 CN CN2011205577553U patent/CN202374268U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188012A (en) * | 2011-12-28 | 2013-07-03 | 深圳新飞通光电子技术有限公司 | Optical power detection circuit for OLT module |
| CN103259591A (en) * | 2013-04-24 | 2013-08-21 | 深圳市极致兴通科技有限公司 | GPON OLT module RSSI fast sampling circuit |
| CN103259591B (en) * | 2013-04-24 | 2016-02-10 | 深圳市极致兴通科技有限公司 | GPON OLT module RSSI quick sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170531 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Patentee after: Shenzhen Apat Optoelectronics Components Co., Ltd. Address before: South South technology twelve road 518057 in Guangdong Province, Shenzhen high tech Industrial Park, No. 8 Frestech. Patentee before: Shenzhen Neo Photonic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |