| 1, Description
OPR1001K RFOG optical receiver is the bidirectional ONU equipment that is specially developed for HFC structure bidirectional metropolitan area broadband network. Rely on several years’ research experience for CATV HFC fiber transmitting equipment. Take full account of the FTTH (Fiber to the Home) network topology, the engineering technology problem of CATV bidirectional return channel noise collection and the high reliability network security transmission requirements of modern CATV business. The return path adopts the burst mode (open the laser when have return signal), which greatly reduced the noise collection.
1) Laser control circuit adopts unique design; the work is reliable and stable.
2) Excellent AGC characteristic, when the input optical power range is -7～+2dBm, the output level remain unchanged, CTB and CSO basically unchanged.
3) Optimizing circuit design, SMT production process, optimizing the whole signal path, makes the photoelectronic signal transmission more stable, RF linear indicators higher.
4) Professional RF attenuator circuit, with good attenuation linear and high precision.
5) GaAs amplifier device, with good index, low distortion and high reliability.
7) The shell adopts aluminum die casting, cooling effect is good and the appearance is exquisite.
3. Technique Parameters
3.1 Link testing conditions
The performance parameters of this manual according to the measuring method of GY/T 194-2003 < Specifications and methods of measurement on optical node used in CATV systems >, and tested in the following conditions.
Test condition:
1. Forward optical receive part: with 10km standard optical fiber, passive optical attenuator and standard optical transmitter composed the testing link. Set 59 PAL-D analog TV channel signal at range of 47/85MHz ～550MHz under the specified link loss. Transmit digital modulation signal at range of 550MHz ～862/1003MHz, the digital modulation signal level (in 8 MHz bandwidth) is 10dB lower than analog signal carrier level. When the input optical power of optical receiver is -1dBm, the RF output level is 92dBμV, measure the C/CTB, C/CSO and C/N.
2. Backward optical transmit part: Link flatness and NPR dynamic range are the link indexes which is composed of backward optical transmitter and backward optical receiver.
Note: When the rated output level is the system full configuration and the receiving optical power is -2dBm, equipment meets the maximum output level of link index. When the system configuration reduce (that is, actual transmission channels reduce), the output level of equipment will be increased.
|
Burst Mode (Select this mode, see below) |
|
Optical Output Power
(Close the burst mode) |
dBm |
-30 |
|
Laser Turn On Threshold |
dBμV |
≥70 |
|
Laser Turn Off Threshold |
dBμV |
≤62 |
|
Laser Turn On Time (t1) |
us |
0.5≤ t1 ≤1 |
|
Laser Turn Off Time (t2) |
us |
0.5≤ t2 ≤1.5 |
3.2 Technique Parameters
|
Item |
Unit |
Technique Parameters |
|
OPR-1001K |
|
Forward Optical Receive Part |
|
Optical Parameters |
|
Receiving Optical Power |
dBm |
-7 ~ +2 |
|
Suggested Use Range |
dBm |
-3 ~ +1 |
|
Optical Return Loss |
dB |
> 45 |
|
Optical Receiving Wavelength |
nm |
1100 ~ 1600 |
|
|
|
FC/APC, SC/APC (or specified by the user) |
|
Optical Fiber Type |
|
Single mode |
|
Link Performance |
|
C/N |
dB |
≥ 51 received optical power (-1dBm) |
|
C/CTB |
dB |
≥ 68 |
|
C/CSO |
dB |
≥ 65 |
|
RF Parameters |
|
Frequency Range |
MHz |
47/54/70/85～862(1003) |
|
Flatness in Band |
dB |
±0.75 |
|
Rated Output Level |
dBμV |
≥ 92 |
|
Max Output Level |
dBμV |
≥ 92 |
|
Output Return Loss |
dB |
≥16 |
|
Output Impedance |
Ω |
75 |
|
Reverse Optical Transmit Part |
|
Optical Parameters |
|
Optical Transmit Wavelength |
nm |
1310±10, 1550±10 or specified by the user |
|
Laser Type |
|
DFB or FP laser |
|
Optical Output Power |
mW |
0.5, 1, 2 |
|
Optical Connector Type |
|
SC/APC (or specified by the user) |
|
RF Parameters |
|
Frequency Range |
MHz |
5 ~30/42/55/65, (or specified by the user) |
|
Flatness in Band |
dB |
±0.75 |
|
Input Level |
dBμV |
75～85（Suggested input 80） |
|
Input Return Loss |
dB |
≥ 16 |
|
Output Impedance |
Ω |
75 |
|
NPR dynamic range |
dB |
≥15 (NPR≥30 dB) |
≥10 (NPR≥30 dB) |
|
Use DFB laser |
Use FP laser |
|
General Performance |
|
Power Voltage |
V |
DC12V |
|
Operating Temperature |
℃ |
－30～＋70 |
|
Storage Temperature |
℃ |
－30～＋70 |
|
Relative Humidity |
％ |
Max 95% no condensation |
|
Consumption |
W |
≤6 |
|
Dimension |
mm |
154（L）x 116（W）x 26（H） |
4. Block Diagram
|
