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Optical Transmitter
Fx-ES10XL	Optical Transmitter 1550 nm
Fx-ES26XL	Optical Transmitter 1550 nm
Fx-DS26	Optical Transmitter 1550 nm
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BaalFTTx - Series

Fx-DS26 OPTICAL CATV AND SAT-IF TRANSMITTER		print pdf version




Application Electrical to optical conversion of multichannel CATV signals like AM-VSB, FM and QAM signals Electrical to optical conversion of SAT-IF video signals by separate input The 1550 nm versions enable the usage of optical amplifiers (EDFAs) as boosters or repeaters in order to realize FTTx HFC networks Features SBS suppression with very high SBS threshold and 1550 nm pre-chirping technology Bandwidth of 47…870 MHz for CATV and 950 …2605 MHz for SAT-IF All-electronically adjustments for CATV input: slope, gain, output power, OMI, pre-chirping etc. Automatic load control (ALC) for constant OMI_totrms of CATV signals Linearity optimized versions either for European Cenelec 42 or for Japanese NTSC74 channel allocation Separate RF input for SAT-IF ITU-Grid wavelength, wavelength adjustable ±100 GHz Front panel RF test point –20 dB Dual, hot-plug-in power supply modules for 100…240 VAC, -48 VDC, +24 VDC Web and SNMP Interface LC display and LED status indication General purpose I/O interface for remote functions Very thin, only 1 U design for mounting into 19”, ETSI or JIS racks Block Diagram

General Technical Data
General	Unit
Wavelength	[nm]	Type 1310: 1290 … 1330 Type 1550 : 1540 … 1560 Type DWmm : according to ITU grid no. mm
Wavelength adjustment range	[GHz]	Type DWmm: -100 … +100 in steps of 50
Optical output power	[dBm]	Type 70: +7 … +10 Type 80: +8 ±0.5 Type 110: +11 ±0.5 Type 130: +13 ±0.5
Side mode suppression	[dB]	> 30
Relative intensity noise (optical return loss > 40 dB)	[dBc/Hz]	< -155
SBS suppression ^{1) 3) 4)} (measured for 25 km fiber length and NTSC74 or Cenelec42 input)	[dBm]	Type 1310: ≥ +16.0 Type 1550: ≥ +18.0 Type DWmm: ≥ +18.0
Opt. connector		Any type of high return loss connectors rear side mounted
Optical fibre		Standard single mode 9/125 µm
RF-connector/impedance		F-female, 75 Ohm, rear side mounted
Control interface		Ethernet 10/100 interface
Climatic specification
Operation Storage		ETS 300 019, class 3.1 ETS 300 019, class 1.2
EMI		EN50083-2, EN50083-2 /A1
Safety		EN 50083-1 and EN 60950, Laser class 1M according IEC 60825-1 (eyesafe for normal viewing)
Power supply Dual redundant, hot pluggable		100 ... 240 VAC, 36 ... 72 VDC or 23.5 ... 24.5 VDC
Power Consumption		110 VAC: < 25/34 VA (1/2 power supplies) 48 VDC: < 21/25 W (1/2 power supplies)
Enlosure dimensions		19” / 1 RU (optionally compatible to ETSI or JIS standards)
Weight	[kg]	9 (including two power supplies)

CATV Signal Data
CATV input impedance	[Ohm]	75
Frequency range	[MHz]	5 … 870
Frequency respons at 80 dBµV/5% 5 ... 7MHz 7 ... 47 MHz 47 ... 606 MHz 606 ... 870 MHz	[dB] [dB] [dB] [dB]	± 1.5 ± 0.75 ± 0.5 ± 0.75
Return loss 5 ... 47 MHz 47 ... 870 MHz	[dB] [dB]	≥ 18 ≥ 20 (at 47 MHz) – 1.5 dB/oct., min. 15
Input level (referred to OMI = 5%)	[dBµV]	73 minimum
Gain adjustment range	[dB]	0 … 24
Slope adjustment range (10…870 MHz)	[dB]	-3 (cable equivalent) … +16 (cable equalization)
Testpoint attenuation	[dB]	20

Version	Fx-DS26-	1310 -nnn-C42	1310 -nnn-N74	1550/DWmm -70-C42	1550/DWmm -70-N74
CNR ¹⁾
0 … 15 km fibre length 15 … 25 km fibre length	[dB] [dB]	51³⁾ 50³⁾	51⁴⁾ 50 ⁴⁾	50.5³⁾ 49³⁾	50.5⁴⁾ 49⁴⁾
CSO ¹⁾	[dB]	65³⁾	65⁴⁾	53 ²⁾³⁾ (f<600 MHz: 58)	58 ²⁾⁴⁾
CTB ¹⁾	[dB]	64³⁾	64 ⁴⁾	62 ³⁾	62 ⁴⁾

SAT-IF Signal Data
SAT-IF input impedance	[Ohm]	75
Frequency range	[MHz]	950 … 2605
Frequency response	[dB]	± 2
Return loss	[dB]	≥ 10
Version	Fx-DS26-	1310 -nnn-C42	1310 -nnn-N74	1550/DWmm -70-C42	1550/DWmm -70-N74
Nominal input level per FM video carrier	[dBµV]	92⁵⁾	90⁶⁾	92⁵⁾	90⁶⁾
CNR ¹⁾ referred to nominal FM video carrier	[dB]	27⁵⁾	25⁶⁾	27⁵⁾	25⁶⁾
Spurious signals referred to nominal FM video carrier	[dBc]	35⁵⁾	40⁶⁾	35⁵⁾	40⁶⁾

Test Conditions

¹⁾ P_opt,in= 0 dBm, appropriate receiver technology with I_eq= 7.0 pA/√Hz and η = 0.95 A/W (at 1550 nm)    used, CATV and SAT-IF signals transmitted together (see also test conditions 5 and 6 below)
²⁾ Internal prechirping parameter flc set according to connected fiber length: 0 …10km/flc=5km,    5…15km/flc=10km, 10…20km/flc=15km, 15…25km/flc=20km
³⁾ European Cenelec 42 channel allocation with OMI= 4.1% measured with noise bandwidth of 5 MHz
⁴⁾ Japanese NTSC74 channel allocation with OMI= 3.3% measured with noise bandwidth of 4 MHz
⁵⁾ 10 dB backoff of Satellite FM video carriers refered to CATV video carriers, OMI_SAT= 1.3% for SAT-IF    carriers, Cenelec42 carriers with OMI= 4.1%, 27 MHz noise bandwidth
⁶⁾ 10 dB backoff of Satellite FM video carriers refered to CATV video carriers,
   OMI_SAT= 1.0% for SAT-IF carriers, NTSC74 carriers with OMI= 3.3%, 27 MHz noise bandwidth

Ordering information
For more information on this product please contact BKtel communications. Properties for ordering optical transmitter Fx-DS26
Optical output power	70 80 110 130	+7.0 dBm +8.0 dBm +11.0 dBm +13.0 dBm
Freyuency plan *)	C42 N74	Cenelec 42 NTSC 74
I/O ports	0 1	No Yes
Wavelength	1310 1550 DWmm	1310 nm 1550 nm DDM ITU grid no. mm
Optical connector	1 2 3 4 5	E2000 SC/APC FC/APC-NTT FC/APC_JDS SC/APC with shutter
RF input / optical output	F R	on front side on rear side
Version	0 OEM	BKtel OEM
Power supply	230/230 48/48 230 48 24 230/48	2 x (100...240 VAC) 2 x (36...72 VDC) 1 x (100...240 VDC) 1x (36...72 VDC) 1 x (23.5 ... 25.5 VDC) mixed 230 VAC / 48 VDC
*) Other frequency plan on request!

Available Types
Fx-DS26-1310-80-C42,Fx- DS26-1310-110-C42 and Fx-DS26-1310-130-C42 Fx-DS26-1310-80-N74, Fx-DS26-1310-110-N74 and Fx-DS26-1310-130-N74 Fx-DS26-1550-70-C42 and Fx-DS26-1550-70-N74 Fx-DS26-DWmm-70-C42 and Fx-DS26-DWmm-70-N74 with mm=21, 23, … 45

BKtel communications GmbH - www.bktel.com - E-Mail: info@bktel.com
Specifications subject to change without notice


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