1,CATV Fiber Optic 1550nm Transmitter 2,Direct Modulated 3,SBS restrain>=17dBm 4,CSO<=-57dB CNR>=50dB 5,Can be used in FTTx HT1500BC (CATV wavelength)HT1500BU (ITU standard wavelength)CATV Direct Modulated Fiber Optic 1550nm Transmitter Product descriptionExternal modulation technology for HT1500B 1550nm transmitter, with the laser working in direct current, has the advantages of no laser chirp, low dispersion distortion, large extinction ratio, and high speed. 1550nm transmitter also has the disadvantages of high cost and high difficulty in manufacturing.Direct modulation will lead to high laser chirp (Laser's bias current is modulated by signal and the optical spectrum shifts and shakes). Laser chip will interact with dispersion effect caused by standard single mode fiber (SMF-28), which will generate serious distortion in the place of 1550nm. This kind of distortion will become more serious with the increase of transmission distance, bandwidth and channel number.At present, international high performance direct modulation 1550nm transmitter has no obvious performance inferior while transmitting an analog and digital multiplexing full channel signal with transmission distance≤15Km or transmitting digital load with transmission distance≤40Km.Huatai HT1500B is a direct modulation 1550nm transmitter with high index and without AGC function. It adopts high linearity and low chirp DFB laser, built-in pre-distortion compensation and AGC, APC, ATC closed loop control, which improves the system index obviously. The 1550nm transmitter can be used in FTTx (≤10Km) of second-grade service area (Sub-HE), and can also be used in WDM narrow-band multiplexing and IP/QAM.HT1500BC 1550nm transmitter: CATV wavelength.HT1500BU 1550nm transmitter: ITU standard wavelength. Product featureLow chirp, high linearity DFB laser.Dual module RF driver, high efficient laser pre-distortion adjustment.Intuitionistic modulation status display.Perfect APC, ATC closed loop control.Built-in dual back-up power supply, switch automatically.Casing temperature auto-control Technical Index

Performance			Index	Supplement
Optic feature	Wavelength	(nm)	1548~1563	HT1500BC: CATV wavelength
			1530~1563	HT1500BU: ITU wavelength
	Linewidth	(MHz)	≤1	FWHM
	Side mode suppression ratio	(dB)	≥45	SMSR
	Extinction ratio	(dB)	≥20	Xp
	Equivalent noise intensity	(dB/Hz)	≤-160	RIN (20~1000MHz)
	Output power	(dBm)	6	Optional 3, 10
	Return loss	(dB)	≥55
	optical fiber connector		FC/APC	Optional SC/APC
RF feature	Work bandwidth	(MHz)	45-862
	Input level	(dBmV)	20	±2
	Flatness	(dB)	≤±0.75	45~862MHz
	Return loss	(dB)	>16
	Input impedance	(Ω)	75	RF/INPUT
	RF test	(dB)	0±1
Link feature	Transmit channel		PAL-D/59CH	NTSC/77CH
	CNR	(dB)	≥50	-1dBm receive
	CTB	(dB)	≤-63
	CSO	(dB)	≤-57
	SBS restrain	(dBm)	≥17
General feature	Network management interface		RJ45, RS232	Support I.E. & SNMP
	Power supply	(V)	90~265 city power	-48VDC optional
	Power Consume	(W)	≤50	Single power works
	Work temp.	(°C)	-5~65
	Storage temp.	(°C)	-40~85
	Operating relative humidity	(%)	5~95
	Size (W)x(D)x(H)		19×14.2×1.75 ( " ) 483×360×44 ( mm )

Direct Modulated Fiber Optic 1550nm Transmitter without AGC HT1500B