• Table of contents
• 2.3 Main Parameters
  • 2.3.1 Optical link
  • 2.3.2 Coaxial cable

2.3 Main Parameters¶

This part lists the main specifications and highlights the main parameters to compare an optical link with a coaxial cable

2.3.1 Optical link¶

The optical link consists of :

• Optical transmitter OTX1910 : it modulates the intensity of the optical 1320 nm wavelength with the RF input signal ;
• Monomode fiber 9/125 OS2 (to avoid dispersion effect) to optical signal on a distance up to 10 kilometers ;
• Optical Receiver ORX1900 : it detects optical wavelength intensity modulation and outputs the RF modulating signal.

Optical transmitter OTX1910

Optical transmitter OTX1910	min	typ	max	Unit	comments
Supply	9	12	14	V
Current consumption	-	-	450	mA
RF Input Connector	75 Ohm F-type
RF Return Loss	14	-	-	dB
RF Maximum Input Level	-	-	15	dBm
RF Input Dynamic Range	-65	-	-10	dBm
RF Input Frequency	700	-	2300	MHz
Optical Connecctor	LC/PC single mode
Optical signal wavelength	-	1310	-	nm
Optical power level	-	1	-	dBm

Fiber Monomode 9/125 OS2 (G.652.D ITU-T compliant), low dispersion at 1320 nm

Fiber Optic	min	typ	max	Unit	comments
Optical Loss	-	0.3	-	dB/km	1320 nm

Optical receiver ORX1900

Optical receiver ORX1900	min	typ	max	Unit	comments
Supply	9	12	14	V
Current consumption	-	240	-	mA
Optical Input Connector	LC/PC single mode
Optical input signal wavelength range	1270	1310	1610	nm
Optical input signal level range	-6	-	4	dBm
RF Output Connector	75 Ohm F-type
RF Input Frequency	700	-	2300	MHz

Optical link with fiber length of 1 m

Optical link with fiber length of 1 m	min	typ	max	Unit	comments
Noise Figure	-	-	31	dB
Carrier to Noise Ratio	55	-	-	dB	Pin=-13 dBm, Fiber=1 m
SFDR	102	-	-	dB/Hz2/3	Pin=-13 dBm, IM3=50 dBc
IIP3	12	-	-	dBm	Pin=-13 dBm, IM3=50 dBc

2.3.2 Coaxial cable¶

The optical link is a replacement of a coaxial cable EN50117-6 11PATC/PH 1.7/6.9 Class A 3GHz (B93) 17/13 139m.

COAXIAL CABLE	min	typ	max	Unit	comments
/12 RF Loss @ 20°C	-	0.9	-	/12 dB/100m	5 MHz
-	2.7	-	50 MHz
-	3.8	-	100 MHz

- 5,4 - dB/ 100m 200 MHz
- 7,7 - dB/ 100m 400 MHz	- 11 - dB/ 100m 800 MHz	- 11,5 - dB/ 100m 862 MHz	- 12,1 - dB/ 100m 950 MHz	- 14,6 - dB/ 100m 1350 MHz	- 16,7 - dB/ 100m 1750 MHz	- 18,7 - dB/ 100m 2150 MHz	- 22,3 - dB/ 100m 3000 MHz