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

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 from the manufacturer lynx-technik : 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 from the manufacturer lynx-technik : 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

Overall Optical link with fiber length of 1 m

Lynx-technik technical provided us more technical specifications about the optical link. However,

sorry, we don't have any values for phase noise.
And unfortunately we also don't have the tools to measure it in our lab.

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
RF Loss @ 20°C	-	0.9	-	dB/100m	5 MHz
	-	2.7	-		50 MHz
	-	3.8	-		100 MHz
	-	5.4	-		200 MHz
	-	7.7	-		400 MHz
	-	11	-		800 MHz
	-	11.5	-		862 MHz
	-	12.1	-		950 MHz
	-	14.6	-		1350 MHz
	-	16.7	-		1750 MHz
	-	18.7	-		2150 MHz
	-	22.3	-		3000 MHz
IIP3	50	-	-	dBm	Estimation

IIP3 is only an estimation to be compared with optical link : this value is deemed quite conservative due to the fact the cable is a passive component.

2.4 References¶

lynx-technik