Optical Node Unit (ONU) for RFoG networks
About the Product
The Light Link® DPON-SD2 is the Optical Node Unit (ONU) for new “RFoG” (RF over Glass) Fibre-to-the-Home (FTTH) architecture, and is optimized to work over PON standards-compliant FTTH networks. The Society of Cable Telecommunications Engineers has issued their standard document IPS SP 910 to cover the subject and set implementation guidelines.
Rolling out RFoG makes it possible for a cable operator to continue the deployment of DOCSIS-compliant cable modems for Internet and Telephony delivery, together with Video on Demand systems which need an RF return path to operate. The DPON-SD2 optical node looks just like an HFC network for all of the traditional customer premises equipment.
The DPON-SD2 is designed for 1550 nm forward-path RF signals, with return-path RF signals converted to optical at either 1310 nm or 1610 nm in a 1x32 split FTTH network topology.
The DPON-SD2 incorporates an isolated DFB optical laser to modulate the return-path signal from DOCSIS modem onto the fiber. The photodiode featured on the duplex model provides a 1550 nm CATV receiver with a forward path frequency response up to 1003 MHz.
An optional CWDM combines these forward and return-path signals across a 1310/1490 nm EPON/GPON network, offering a transitional platform to migrate existing HFC two-way STB and DOCSIS modem technology to PON FTTH.
Employing leading edge system design, the DPON-SD2 is a must-have in any FTTx/CATV solution. The power of having a Passive Optical Network (PON), but still allowing an RF overlay, offers a multi-functional PON delivering more services over the same infrastructure.
|Forward Path Optical|
|Input level||-6 dBm to 0 dBm
Nominal network design input level:
|Optical input return loss||> 45 dB|
|Forward Path RF|
|RF output level||20 dBmV (1), 36 dBmV|
|RF bandwidth||70 ~ 1218 MHz
85 ~ 1218 MHz
105 ~ 1218 MHz
204 ~ 1218 MHz
|RF flatness||≤ ±1.0 dB|
|RF slope||4 ±1 dB|
|RF output return loss||> 16 dB|
|RF output test point||-20 dB|
|CNR||> 47 dB|
|CSO||< -60 dBc|
|CTB||< -60 dBc|
|Equivalent input noise
|< 5 pA/√Hz|
|Optical ALC range||-6 +3 dBm|
|Optical input indicator
|within range green, out of range red|
|Forward Path CNR (1)|
(1) Measured in a typical 1550 nm transmission system with PBN A-FT5S optical transmitter and 5 km of single-mode fiber to the DPON-SD2, aligned for the recommended nominal optical input power of -5 dBm, with 42 Cenelec carriers and 4% OMI.
Relative Noise Bandwidth (RNB) 5 MHz for PAL television channels. CNR performance for NTSC television channels with 4 MHz RNB is 1 dB better.
Through loss for 1310 and 1490 nm is less than 1 dB.
|Return Path Optical|
|Wavelength||1610 nm (Default)
|Output level||1.5 dBm ±1 dB
3 dBm ±1 dB
5 dBm ±1 dB
|Return loss||> 45 dB|
|Relative intensity noise
|< 145 dB/Hz|
|Return Path RF|
|RF bandwidth||12 ~ 55 MHz
5 ~ 65 MHz or 12 ~ 65 MHz
5 ~ 85 MHz or 12 ~ 85 MHz
5 ~ 105 MHz or 12 ~ 105 MHz
|RF flatness||±1.0 dB|
|RF input return loss||> 18 dB|
|RF input test point||-20 dB|
|RF input range||10 ~ 40 dBmV (3)|
|RF threshold for ACS||< 15 dBmV|
|Power at which the
R-ONU must turn on
|laser must on: 10 ±2 dBmV
laser must off: -4 ±2 dBmV
|External power supply||11 ~ 16 Vdc (4)
450 mA @ 12 Vdc
|Power/RF connectors||SCTE F-type|
|Power connector||2.1 mm DC socket|
|Operating temperature||-20 ºC to +55 ºC|
|Operating humidity||5 % to 95 % (non-condensing)|
|Dimensions (H x W x D)||115 mm x 163 mm x 38 mm|
|Unit weight||0.38 kg|
|Power supply weight||0.22 kg|
|Shipping carton dimensions (contains 10 units)||170 mm x 530 mm x 380 mm|
|Shipping carton weight (contains 10 units)||7.7 kg (5)|
(2) With Active Carrier Suppression enabled, laser optical power level is < -15 dBm when no RF input signal is applied.
(3) Internal adjustment optioned for installer. Factory set at 10% OMI with a 30 dBmV input.
(4) A universal mains plug-pack is supplied with the DPON unit. The plug-pack is suitable for 95 ~ 265 Vac, 50 ~ 60 Hz and has mains pins for AU/CN/EU/UK/US.
(5) DPON-SD2 optical receivers are supplied in bulk pack cartons of 10 units. Individual packaging can be provided on request at additional cost.
|A-RRAG-Q-S-20||AIMA Analog Quad Return RX, RFoG, SC/APC.|
|F-FCHA-4U||FIMA 19” Chassis, 4RU, 16 Slots.|
|F-OSF-1x08-L||FIMA 1:8 Way optical splitter.|
|F-WDMM-08-0-2-xx-S||FIMA DWDM MUX, 8 Ports, start ITUxx, 200 GHz, SC/APC.|
|F-WDMM-16-0-2-xx-L||FIMA DWDM MUX, 16 Ports, start ITUxx, 200 GHz, LC/APC.|
|CWDM19-24RFOG61-LC||1RU CWDM, 24x RFoG/(G/E)PON with 1610 nm RFoG return and 1550 nm CATV overlay filters, LC/APC.|
|DPON-SD2-[U][VVV]-[WW][X]-[Y]-[ZZ]||Optical Node Unit (ONU) for RFoG Network - Single Dwelling Unit (SDU)|
|0||No optical bypass port|
|G||Optical bypass port for external EPON or GPON ONU on 1310/1490 nm|
|X||Optical bypass port for external EPON, GPON,10G EPON or 10G GPON ONU on 1270/1310/1490/1577 nm|
|0||Forward-path receiver only, no diplexer|
|65A||5~65 / 85~1218 MHz RF diplexer|
|85A||5~85 / 105~1218 MHz RF diplexer|
|24A||5~204 / 258~1218 MHz RF diplexer|
|55B||12~55 / 70~1218 MHz RF diplexer|
|65B||12~65 / 85~1218 MHz RF diplexer|
|85B||12~85 / 105~1218 MHz RF diplexer|
|24B||12~204 / 258~1218 MHz RF diplexer|
|WW||Return Path Laser Transmitter|
|0||Forward-path receiver only, no return-path transmitter|
|29||Isolated DFB laser 1290 nm|
|33||Isolated DFB laser 1330 nm|
|35||Isolated DFB laser 1350 nm|
|37||Isolated DFB laser 1370 nm|
|39||Isolated DFB laser 1390 nm|
|41||Isolated DFB laser 1410 nm|
|43||Isolated DFB laser 1430 nm|
|45||Isolated DFB laser 1450 nm|
|47||Isolated DFB laser 1470 nm|
|51||Isolated DFB laser 1510 nm (1)|
|53||Isolated DFB laser 1530 nm (1)|
|59||Isolated DFB laser 1590 nm (1)|
|61||Isolated DFB laser 1610 nm|
|X||Return Path Optical Power Output|
|1||1.5 dBm ±1 dB|
|3||3 dBm ±1 dB|
|5||5 dBm ±1 dB|
|Y||Forward Path RF Output Level|
|1||20 dBmV at 1218 MHz|
|2||36 dBmV at 1218 MHz|
|ZZ||Power Supply (2)|
|6C||35-95 Vac to 12 Vdc power supply, coaxial cable in and coaxial cable out|
|EU||95~265 Vac to 12 Vdc power supply, European adaptor|
|US||95~265 Vac to 12 Vdc power supply, American adaptor|
|UK||95~265 Vac to 12 Vdc power supply, United Kingdom adaptor|
|AU||95~265 Vac to 12 Vdc power supply, Australian adaptor|
|CN||95~265 Vac to 12 Vdc power supply, Chinese adaptor|
|CH||95~265 Vac to 12 Vdc power supply, Switzerland adaptor|
(1) Will not BOSA laser technology, the price will different with other wavelength.
(2) Additional country-specific adapters are available upon request.