External modulation technology, with the laser working in direct current, has the advantages of no laser chirp, low dispersion distortion, large extinction ratio, and high speed. It 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 1550nm direct modulation 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.
HT1500A is a 1550nm direct modulation optical transmitter with high index and 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. HT1500A direct modulated optical transmitter can be used in FTTx (≤10Km) of second-grade service area (Sub-HE), also can be used in WDM narrow-band multiplexing and IP/QAM.
1. Low chirp, high linearity DFB laser, chirp compensation.
2. Dual module RF driver , high efficient laser pre-distortion adjustment.
3. Full-automatic OMI control, AGC & MGC.
4. Intuitionistic modulation status display.
5. Built-in dual back-up power supply, switch automatically .
6. Casing temperature auto-control, ensure the long life of the laser.
1. Provide IPTV, VOD value-added service in second-grade service area (Sub-HE).
Analog digital mixed transmit <15Km (common distance ≤ 10km).
Pure digital load <40Km.
2. WDM narrow band multiplex >70Km.
| Performance | Index | Supplement | |||
Optical feature | Wavelength | (nm) | 1548~1563 | HT1500AC: CATV wavelength | |
| 1530~1563 | HT1500AU: ITU standard wavelength | ||||
| Linewidth | (MHz) | ≤1 | FWHM(△λ) | ||
| 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 | 3, 10 Options | ||
| Return loss | (dB) | ≥55 | |||
| Optical fiber connector | FC / APC | Optional SC / APC | |||
| RF feature | Work bandwidth | (MHz) | 47-862 | ||
| Input level | (dBmV) | 20±2 | AGC | ||
| Flatness | (dB) | ≤±0.75 | 47~862MHz | ||
| Return loss | (dB) | >16 | |||
| Input impedance | (Ω) | 75 | RF/INPUT | ||
| RF test | (dB) | 0±1 | |||
| Link feature | Transmit channel | PAL-D / 60CH | NTSC/80CH | ||
| 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) | 90~265city power | -48VDC optional | ||
| Power Consume | (W) | ≤50 | Single power works | ||
| Work temp. | (ºC) | -5~65 | Machine temp. control automatically | ||
| Storage temp. | (ºC) | -40~85 | |||
| Relative humidity | (%) | 5~95 | |||
| Size (W)x(D)x(H) | ( " ) | 19×10×1.75 | |||
1. What are the payment terms of payment?
Usually, we accept T/T, PayPal, Western Union, and Alibaba Trade Assurance. You can select the terms of payment which is more convenient for you.
2. What about the lead time?
Usually, if there's stock, we ship the goods within 5-7 working days after the deposit is confirmed. If it is out of stock, the lead time depends.
3. How about the shipping?
When the package is small, we will deliver the goods via international Express like FedEx , DHL,TNT and UPS and so on. Door to door delivery service will be provided; while the goods have high weight and volume, we suggest using air or sea shipment.
4. Can you do OEM for us?
Yes. if there is a certain order quantity, we can do OEM including printing, logo, and customized model for you.
5. What are the advantages of your products?
A. Good quality and competitive prices
B. Strict quality control during production process.
C. Professional operations in processes of production, sales, assembling, packaging and shipping
D. Good after-sale service. Professional online technical support can be provided. Moreover, if there is any problem of the goods, we will help to solve the problem or provide replacement of the goods
6. How about the Warranty?
There are 12 months for the warranty. While the warranty is not responsible for those broken by violence or updated with other brands.