Optical Communications Mainframe - Laser Transmitter Module

Transcription

1 About the Product The LTM13 Multi Quantum Well (MQW) Distributed Feedback (DFB) laser transmitter module has been designed for cable television and HFC broadband applications. The LTM13 module easily fits into the OCM chassis with plug and play technology to suit a variety of applications. The laser transmitter module is available in optical power levels from 2 dbm to 15 dbm. The unit offers superior frequency response, distortion and noise characteristics. The LTM13 incorporates specialised circuitry to deliver the best possible CTB and CSO performance up to 1000 MHz. There is also a return path version of this transmitter with a bandwidth of 5 MHz to 220 MHz. The return path transmitter includes a 4.5 MHz pilot tone generator for system alignment. The LTM13 employs the latest in broadband linear amplifier technology. In addition, it is a leading edge optoelectronic design for the delivery of high-quality transmission, in both analogue and digital formats, over fibre optic networks. Microprocessor based status monitoring and control is available for operation from the local OCM keypad or remotely via the network, using the PBN NMS3 network management software. All module settings are retained in NV memory to ensure trouble free operation. Copyright 2011 Pacific Broadband Networks (PBN). All rights reserved. Reproduction without consent is prohibited. 1/6

2 Features Plug-and-play OCM module. High quality 1310 nm cooled MQW DFB cable television laser with superior RF driver circuitry. RF amplifier gain blocks with advanced GaAs technology for better performance. Suits CENELEC and NTSC standards up to 110 channels (both analogue and digital). Frequency response of 45 MHz to 1000 MHz for forward path transmitter, or 5 MHz to 220 MHz for return path transmitter. Remote monitoring and laser shutdown facilities via network management system or module status port. Local laser shutdown via the OCM keypad or the module status port. Alarm monitoring via module status port and network management system. Automatic gain control for constant optical modulation index (OMI). Automatic Peltier thermo-cooler control for constant laser temperature. Automatic laser power control for constant optical output. Copyright 2011 Pacific Broadband Networks (PBN). All rights reserved. Reproduction without consent is prohibited. 2/6

3 System Block Diagram Forward Path Laser Transmitter Module System Block Diagram Return Path Laser Transmitter Module Copyright 2011 Pacific Broadband Networks (PBN). All rights reserved. Reproduction without consent is prohibited. 3/6

4 Specifications Optical Performance Operating wavelength: Output power: Optical return loss: Optical connectors: Laser RIN: Standard 1311 nm with options for 1291/1331/1351/1371 nm 2 dbm to 15 dbm (see order options) > 60 db SC/APC, E2000/APC, FC/APC -156 db/hz to -160 db/hz RF Performance RF bandwidth LTM13-[W]-200-[Y]-[Z]: LTM13-[W]-1000-[Y]-[Z]: RF input level: RF flatness: AGC gain control range (RF in): RF impedance: RF test points: Pilot tone level: 5 MHz to 220 MHz 45 MHz to 1000 MHz 25 dbmv for 4% OMI 0.75 db -10 db to +10 db db -10 db from nominal carrier level (LTM13-[W]-200-[Y]-[Z]) Link Performance General Power: 64 PAL B/G, D channels 42 CENELEC channels 79 NTSC channels (as per EN ) 54~550 MHz with digital channels 550~ dbc CNR: > 52.5 db (5 MHz RNB) > 52.5 db (5 MHz RNB) > 52.5 db (4 MHz RNB) CSO: > 63 dbc > 63 dbc > 63 dbc CTB: > 67 dbc > 67 dbc > 67 dbc Measured with PBN FPRM optical receiver module, with 10 km single mode optical fibre, 0 dbm input, 4% OMI. Operating temperature: Dimensions (H x W x D: Weight: Via OCM back plane 0 C to 45 C 160 x 44 x 360 mm 1.5 kg Ship size (H x W x D): 280 x 70 x 570 mm Volume 11.2 dm 3 Ship weight: Network management: 2 kg NMS3-NetCraft or NMS3-Enterprise-II Copyright 2011 Pacific Broadband Networks (PBN). All rights reserved. Reproduction without consent is prohibited. 4/6

5 Order Details LTM13-[W]-[X]-[Y]-[Z] Laser Transmitter Module 1310 nm Options: W Optical Output Power mw (2 dbm) optical power mw (4 dbm) optical power 04 4 mw (6 dbm) optical power 06 6 mw (8 dbm) optical power 08 8 mw (9 dbm) optical power mw (10 dbm) optical power mw (11 dbm) optical power mw (12 dbm) optical power mw (13 dbm) optical power mw (14 dbm) optical power ** mw (15 dbm) optical power ** X RF Bandwidth MHz to 220 MHz, return path transmitter MHz to 1000 MHz, forward path transmitter Y SC E FC Optical Connector Type SC/APC E2000/APC FC/APC Z Optical Wavelength nm wavelength nm wavelength *** nm wavelength nm wavelength nm wavelength ** Laser transmitters for 25 mw or 31 mw are available to special manufacturing order with extended lead times and somewhat reduced performance parameters. Call for details. *** Default wavelength if none is specified. Suffix Z is not appended to the order code for modules with the 1311 nm default wavelength. Copyright 2011 Pacific Broadband Networks (PBN). All rights reserved. Reproduction without consent is prohibited. 5/6