Product Overview

The QAMnet EMLT-1550-HP series of laser transmitters are designed for use in HFC, deep fiber, and FTTH applications. The EMLT-1550-HP series transmitters are a cost-effective and high-power transmission solution for HFC/deep fiber networks, regardless of architecture. The EMLT-1550-HP transmitters utilize a zero-chirp external modulator and pre-distortion circuit which allows the transmission range to be extended up to 65 km, while maintaining a high OMI level and excellent CSO and CTB performance. The SBS suppression level can be adjusted from +13 dBm to +16 dBm.

The EMLT-1550-HP also features a built-in EDFA which produces up to +24 dBm optical output for greater distribution and larger network coverage. Designed to be digitally ready, EMLT-1550-HP transmitters can be loaded with 60 additional QAM modulated signal channels.

QAMnet EMLT-1550-HP are available in these output power level versions: +15 dBm, +18 dBm, +20 dBm, +23 dBm and +24 dBm.

Applications

• HFC
• FTTH
• Deep Fiber Applications

Features

• High power CW laser module
• Zero-chirp external modulator
• Built-in EDFA, with output up to +24 dBm
• Up to 65 km transmission range
• Adjustable SBS suppression level range of +13 dBm to +16 dBm
• Supports 75 channel NTSC plus 60 digital channels loading plan
• AGC (Automatic Gain Control) and MGC (Manual Gain Controls) RF input control
• -20 dB front panel RF test port
• 45 to 870 MHz modulation bandwidth

Feature Name	Description
Technical Specification
Laser Wavelength Range	1550 nm ± 15 nm, Specific Wavelength on ITU Grid optional
Transmission Range	Up to 65 km in SMF-28 Fiber
Output Power Level	15 dBm, 18 dBm, 20 dBm, 23 dBm, 24 dBm
Number of Optical Outputs	1 port standard, or customer can specify 2, 4, 8 or 16 ports
Noise Bandwidth	4 MHz
Carrier to Noise Ration (CNR)	51 dB typ. @ 0 dBm
Composite Second Order (CSO) Distortion	-63 dBc max.
Composite Triple Beat (CTB) Distortion	-63 dBc max.
Front Panel RF Gain / OMI Adjustment Range	+6 dB / -6 dB
SBS Suppression Level	Select from +13 dBm and +16 dBm
Input RF Power Level	13 to 25 dBmV per channel
Frequency Range	45 MHz to 870 MHz
Flatness in Frequency Range	±1.0 dB
Input Impedance	75 Ω
Input RF Return Loss	16 dB min.
Mechanical Specification
Operation Temperature Range	0°C to +50°C
Storage Temperature Range	-40°C to +70°C
Power Supply	80 – 240 V, 43 – 63 Hz AC
Power Consumption	50 W max.
Housing Dimensions	2U Rack: 19”(W) x 14”(D) x 3.5”(H)
Control / Monitoring	DFB laser / pump laser temperature and current
Display	Output Power Level, TEC temperature
Alarm	Over Temperature , Over Current
Optical Connectors	SC/APC or Customer Specified