1550nm External Modulation CATV Optic Transmitter

RFTV is a unidirectional analogue and digital video broadcast, it adopts high efficiency modulation mode for RF carrier wave, its economical efficiency, flexibility and bandwidth validity is beyond comparison for IPTV.
        In FTTx fiber access networks, adopting EPON or P2P access mode to realize triple-play, it needs to build a high quality RFTV broadcast network with 1550nm optical wavelength, AM1550nm External Modulation optical transmitter is the core equipment in this system.
        The remarkable advantage for External Modulation technology is no laser chirp, low dispersion distortion. External Modulator doesn’t generate CSO distortion after reasonable bias. It can be followed by amplifier for large area coverage of over-long trunk and local networks. Adopting WDM, it is the development trend of CATV network to transmit optical channels with multi-wavelength through one fiber. 
        This External Modulation CATV optic transmitter adopts low noise, narrow bandwidth, continuous wave laser as light source and American JDS-U LiNbO3 external modulator as signal modulation, which eliminates laser chirp effect which is caused by 1550nm laser Internal Modulation. Due to adopting owned system optimized control technology & using top grade key parts, its performance and index completely comply with international industrial standard.

《Product Feature》
No laser chirp, low dispersion distortion, high extinction ratio
Original system optimized control technology, offers excellent CNR, CTB, CSO & SBS index
Flexibility: Original SBS critical value 13, 16, 18 adjustable at spot, it can fit for different network, OMI adjustable optimized at spot, AGC mode is optional at spot
Reliability: build-in double power supplies, switch automatically.
                    Machine case temperature control automatically.
High quality: intuitionistic Optic Modulation Identity (OMI) display
                        Advanced network management function( each unit has separate IP address)

Performance			Index	Supplement
Optic feature	Laser wavelength	(nm)	1550±5	Accordable with ITU-TG.692 Standard wavelength
	Linearity width	(MHz)	≤1	(△λ)
	Side mode suppression ratio	(dB)	≥45	SMSR
	Equivalent noise intensity	(dB/Hz)	≤-160	RIN (20~1000MHz)
	Output power	(dBm)	2×7	2×5, 2×9, 1×7, 2×6
	Return loss	(dB)	≥60
	Optic fiber connector		FC/APC	SC/APC or E-2000
RF feature	Work bandwidth	(MHz)	45-862
	Input level	(dBmV)	18~28	AGC
	Flatness	(dB)	≤±0.75	45~862MHz
	Return loss	(dB)	>16	45~750MHz
	Input impedance	(Ω)	75
Link feature	Transmit channel		PAL-D/60CH	NTSC/80CH
	CNR1	(dB)	≥53	Back to back
	CNR2	(dB)	≥52	65Km optic fiber, 0dBm receive
	CTB	(dB)	≤-65
	CSO	(dB)	≤-65
	SBS restrain	(dBm)	≥16.0	13、16 Adjustable
General feature	Network interface port		RJ45, R232	Support I.E. & SNMP
	Power supply	(V)	90~265VAC	-48VDC optional
	Power Consume	(W)	≤50	Single power works
	Work temp.	(℃)	-5~65	Machine temp. control automatically
	Storage temp.	(℃)	-40~85
	Operating relative humidity	(%)	5~95
	Size	(")	19×14.5×1.75	(W)x(D)x(H)

Model	Output Power(dBm)	SBS Restrain(dBm)	System index(59 routes PAL-D)
			CNR1	CNR2	CTB	CSO
2*5	Dual fiber output≥5	13.16.18 Adjustable	≥53	≥52	≤-65	≤-65
2*6	Dual fiber output≥6		≥53	≥52	≤-65	≤-65
2*7	Dual fiber output≥7		≥53	≥52	≤-65	≤-65
2*9	Dual fiber output≥9		≥53	≥52	≤-65	≤-65
2*10	Dual fiber output≥10		≥53	≥52	≤-65	≤-65
2*11	Dual fiber output≥11		≥53	≥52	≤-65	≤-65