Dvo700 P Fibre Optic Transmitter

Transcript

Product Specification Timo Rantanen DVO700 P September 24, 2002 1(5) DVO700 P FIBRE OPTIC TRANSMITTER DVO700 P is a high performance, extremely linear externally modulated 1550 nm transmitter for DVO fibre optic CATV link. This transmitter type has been optimised especially for an analog channel line up to 550 MHz and a digital loading can be transmitted above 550 MHz. DVO700 P is fully compatible with DVX Head End system. Features − − − − − − − − 1U 19” rack housing SBS suppression +16 dBm enables transmission distance up to 65 km Two optical outputs Built in preamplifier APC circuitry for constant loading Front panel display Front panel test point Remote control of all adjustments by using Commander software DVO700_P_spec_v11.DOC, created on September 23, 2002, printed on September 24, 2002 Product Specification Timo Rantanen September 24, 2002 DVO700 P 2(5) Technical specifications Parameter Specification Note Optical parameters Wavelength Optical line width Output power Relative intensity noise SBS suppression threshold OMI @ 1 ch Number of optical outputs 1550 ± 10 nm 500 kHz 2 x 7.5 dBm -160 dBc/Hz +16 dBm 3% 2 1 2 3 4 5 RF parameters Frequency range Input level Flatness RF impedance RF input return loss Spurious beats Test point 47…862 MHz 75…85 dBµV ±0.75 dB 75 Ω 18 dB -60 dB 75 dBµV 6 7 8 9 10 65 km fibre link, fibre amplifier, NTSC 77 chs C/N @ 0 dBm to receiver CTB CSO 52 dB 65 dB 65 dB 11 12 13 General Supply voltages Power consumption Connectors, RF DVX bus (RS485) Optical Dimensions Weight Enclosure classification Operating temperature range Storage temperature range Operating relative humidity 90…260 VAC / 50…60 Hz 45 W F female RJ-45 SC/APC 485 x 350 x 44.5 8 kg IP21 0...+50 °C -20...+60 °C 0…85% 14 15 DVO700_P_spec_v11.DOC, created on September 23, 2002, printed on September 24, 2002 Product Specification Timo Rantanen DVO700 P September 24, 2002 3(5) Notes 1) This is a variation range between various transmitters. 2) Typical line width of the source laser. The maximum value is 1 MHz. 3) Typical value. The minimum value is +6.5 dBm. 4) Minimum value. 5) Typical value for NTSC 77 chs loading. 6) NTSC 77 chs. The nominal value is 75 dBµV/ ch. 7) Maximum value. 8) Typical value. The minimum value is 16 dB. 9) Maximum value. 10) Typical value for NTSC 77 chs. 11) Typical value. The minimum value is 51.5 dB. The C/N influence of the optical input power of a receiver can be seen in the following example. The fibre link consists of… - DVO700 P transmitter - DVO716 S fibre amplifier - Fibre 40…60 km + optical attenuation, total 14…19 dB optical - Fibre optic CATV receiver (BXO, DXO, DVO, AC8000 etc.) C/N vs. link attenuation 53 C/N 52 51 50 49 2 1 0 -1 -2 -3 Input power of receiver (dBm) DVO700_P_spec_v11.DOC, created on September 23, 2002, printed on September 24, 2002 Product Specification Timo Rantanen DVO700 P September 24, 2002 4(5) Two optical fibre amplifiers can be needed if there are mounted optical splitters generating additional optical losses in a fibre link. The following figure shows the C/N influence of the optical input power of the 2nd fibre amplifier. The fibre link consists of… - DVO700 P transmitter - DVO716 S fibre amplifier - Fibre 0…20 km + optical attenuation, total 7…14 dB optical - DVO716 S fibre amplifier - Fibre 40 km + optical attenuation, total 16 dB optical - Fibre optic CATV receiver (BXO, DXO, DVO, AC8000 etc.) C/N vs. input power of 2nd fibre amplifier 52 C/N 51 50 49 9 8 7 6 5 4 3 2 Input power of 2nd fibre amplifier (dBm) 12) Minimum value. 13) Minimum value for the output 1. The minimum value for the output 2 is 63 dB. 14) Typical value. The maximum value is 100 W. 15) Width x depth x height. DVO700_P_spec_v11.DOC, created on September 23, 2002, printed on September 24, 2002 Product Specification Timo Rantanen September 24, 2002 DVO700 P 5(5) Monitored parameters and functions − − − − − − − − − − − − − Laser status (ON/ OFF) Laser temperature Laser bias current Optical output power Monitor current of monitor photodiode of laser Relative level of RF at modulator Status of CSO compensation circuit Status of SBS circuit Internal supply voltages: +24, +12, +5 and –5 VDC OMI control mode (CW or modulated channels) Level control mode (automatic or manual) Optical power unit selection (dBm or mW) DVX bus address Block Diagram TP IN PREDISTORTION CIRCUIT dB EXTERNAL MODULATOR LASER CONTROL SBS SUPPRESSION CIRCUIT OUTPUT 2 OUTPUT 1 CSO CONTROL CONTROLLER CONTROLLER DVX-BUS DVO700_P_spec_v11.DOC, created on September 23, 2002, printed on September 24, 2002