HT1504

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.

HT1504 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. HT1504 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.

◉ Low chirp, high linearity DFB laser, chirp compensation

◉ Provide IPTV, VOD value-added service in second-grade service area (sub-headend).

          Analog digital mixed transmit <15Km (common distance ≤ 10km).

          Pure digital load <40Km.

◉ WDM narrow band multiplex >70Km.