HT8500A (40~862MHz RFTV) 1550nm External Modulation CATV Optical Transmitter

Product description

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 of IPTV. Adopting EPON or P2P access mode to realize triple-play, FTTx. RFTV broadcasting network in 1550nm optical wavelength still plays an important role, 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. Followed by amplifier when apply in large area coverage of over-long trunk and local networks. Adopting WDM is the development trend of CATV network to transmit optical channels with multi-wavelength through one fiber, it is the development trend of current fiber CATV networking.

Guangtai HT8500 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.

HT8500A: Standard type, 0.65MHz narrow laser line width, ITU standard wavelength optional, SBS 13~19dBm adjustable, SNMP network management, dual fiber output, apply to the head end of CATV station, trunk network.

Product feature High performance: External module technology, no laser chirp, low dispersion distortion,

high extinction ratio. Perfect index: Unique creation technology, offers excellent CNR, CTB, CSO & SBS. Flexibility: Original SBS critical value 13~19 adjustable at spot, it can fit for different network, OMI adjustable optimized at spot, AGC mode is optional at spot. Reliability: 1+1 backup power supply, 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).

Main application

Applied in over-long trunk of central station.

Analog digital mixture transmission >200Km (with dispersion compensation).

Pure digital transmission (without dispersion compensation) >400Km, (with dispersion compensation) >700Km.

Applied in second transmission of sub-station(FTTx), supply with IPTV, VOD increment business.

Technical index

Performance Index Supplement

Optic feature

wavelength range (nm) 1555±5 ITU-TG.692 Standard wavelength

Linewidth (MHz) ≤1 FWHM(λ)

Side mode suppression ratio (dB) ≥45 SMSR

Equivalent noise intensity (dB/Hz) ≤-160 RIN (20~1000MHz)

Output power (dBm) 2×7 Optional 2×5, 2×6, 2×9, 2×10

Return loss (dB) ≥50

optical fiber connector SC/APC Optional LC/APC,FC/APC

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

RF port F-Female

Link feature

Transmit channel PAL-D/60CH NTSC/80CH

CNR1 (dB) ≥53 Back to back

CNR2 (dB) ≥52 65Km optical fiber, 0dBm receive

CTB (dB) ≤-65

CSO (dB) ≤-65

SBS restrain (dBm) 13 ~ 18 Adjustable

General feature

Network interface port RJ45, RS232 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)

Product series

Model Output Power(dBm) SBS Restrain(dBm)System index(59 routes PAL-D)

CNR1 CNR2 CTB CSO

HT8523A Dual fiber 2×3

13~18 Adjustable

≥53 ≥52 ≤-65 ≤-65

HT8524A Dual fiber 2×4 ≥53 ≥52 ≤-65 ≤-65

HT8525A Dual fiber 2×5 ≥53 ≥52 ≤-65 ≤-65

HT8526A Dual fiber 2×6 ≥53 ≥52 ≤-65 ≤-65

HT8527A Dual fiber 2×7 ≥53 ≥52 ≤-65 ≤-65

HT8529A Dual fiber 2×9 ≥53 ≥52 ≤-65 ≤-65

HT8520A Dual fiber 2×10 ≥53 ≥52 ≤-65 ≤-65

HT8521A Dual fiber 2×11 ≥53 ≥52 ≤-65 ≤-65

Test condition: CNR1: Tx to Rx, 0dBm receiving. CNR2: 16dBm EDFA (NF4.5~5.5dB), 65km fiber, 0dBm receiving.

Copyright © 2006-2007 Hangzhou Huatai Optic Tech Co., Ltd. All rights reserved.

Zhejiang ICP keep on record: 05003023