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- Page 1 Operation Manual / OTM-1550/1550L OTM-1550/1550L 1550 nm External Modulated Optical Transmitter Operation Manual 01-2010-v6...
- Page 2 Operation Manual / OTM-1550/1550L DECLARATION Our Company describes the manual of OTM-1550/1550L series 1550nm external modulated transmitter roundly precisely & in latest edition. But we apprizes clients prudently that our company reserves the authority to adjust the relevant content in the file. We will not take the responsibility for the result from the mistake of recommended material, printing &...
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Page 3: Table Of Contents
Operation Manual / OTM-1550/1550L Table of Contents I. Product summary ....................5 1.1 Product summarize ..................5 1.2 Product speciality ..................5 1.3 Technique index ..................5 II. Installation......................6 2.1 Goods receipt checking ................6 2.2 Installation notice..................6 2.2.1 Safety factor ..................... - Page 4 Operation Manual / OTM-1550/1550L V. Network design ....................14 5.1 SBS critical value ‘s choice................14 5.1.1The longest optic fiber distance of system transmission ......14 5.1.2 Fiber input optic power ................14 5.2 Correct connection between TX & EDFA............. 15 5.3 Incorrect connection between TX &...
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Page 5: Product Summary
Operation Manual / OTM-1550/1550L I. PRODUCT SUMMARY 1.1 Product summarize OTM-1550/1550L series external modulated CATV transmitter adopts low noise, narrow bandwidth, and continuous wave laser as its lig source. It uses high linearity LiNbO external modulator to modulate signal. It eliminates the Chirp Effect of 1550nm direct modulated laser. -
Page 6: Installation
Operation Manual / OTM-1550/1550L ≥16.0 SBS restrain (dBm) 13, 16, 18 optional Network interface port RJ45, R232 Support I.E. & SNMP Power supply (V) 90 ~ 265 city power -48VDC optional ≤50 Power Consume (W) Single power works Machine temp. control Work temp. -
Page 7: Static Sensitivity Speciality
If place the optic transmitter on the ground, the static charge will mostly decreased. 2.3 Installation preparation 2.3.1 Environment conditions According to the design request, OTM-1550/1550L series 1550nm optic transmitter can work under 0~50°C (32~122°F) temperature range. We recommend 25°C (77°F) environment temperature. -
Page 8: Equipment Setting
Operation Manual / OTM-1550/1550L 2.4 Equipment setting OTM-1550/1550L series 1550nmTX adopts 1U high，Standard 19″casing. We suggest to keeping 1.75-inch (about 4.5cm) space on the top & bottom of the machine, to ensure the ventilation & heat dispersion. 2.5 Electric connection (1) The machine should have good grounding, grounding resistance＜4Ω. -
Page 9: Operation
Operation Manual / OTM-1550/1550L • Analog signal transmitting quality turns bad • Digital signal wrong data rate will increase • Optic power will be decreased. • Optic receiver’s receipt optic power cannot reach the best range. • Dusty fiber optic connector will pollute other connected optic parts. -
Page 10: Rear Panel Connection
Operation Manual / OTM-1550/1550L 7. AGC status indicator This lamp on, it is in AGC status 8. MGC status indicator This lamp on, it is in MGC status. 9. OMI adjusting This function for user application In AGC status, OMI value adjustable sliglyly In MGC status, OMI value adjustable 3.2 Rear panel connection... -
Page 11: Startup Main Menu
Operation Manual / OTM-1550/1550L C. Press laser start-up keyswitch Front panel shows “KEY ON……”, Laser status lamp turns green from red, machine enters self-checking, after checking it enters working status, display “ Welcome to……” 3.4 Start-up menu Press Status button will display below menu in sequence. - Page 12 The equipment's gateway, it can be edited. last next edit Trap 1: XXX.XXX.XXX.XXXX last next edit The equipment's trap 1, it can be edited. Trap 2:XX.XXX.XXX.XXX last edit The equipment's trap 2, it can be edited. * edit only for OTM-1550 01-2010-v6...
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Page 13: Request For Rf Signal
Operation Manual / OTM-1550/1550L The method of edition: If any menu needs to change, press key into its display interface and press key, then the number will appear flash cursor, press key to set its value. When finished, press key to exit and enter into the next menu, the data will be saved automatically. -
Page 14: Network Design
Operation Manual / OTM-1550/1550L V. Network design 1550nm system can use EDFA to extend transmission distance, when signal is operated in 1550nm, the fiber should be considered of some factors, such as Chromatic Dispersion, SBS, SPM (Self Phase modulated) and other non-linearity effect of optic fiber. The network we designed for you has supplied some simple rules of using the transmitter. -
Page 15: Correct Connection Between Tx & Edfa
Operation Manual / OTM-1550/1550L The general CATV operator will use high power EDFA (such as 22dBm and higher one), and use optic splitter to arrange the power transmitting in the optic fiber & cable. It is no problem to do this, because the optic fiber patch cord is short. But it is necessary to notice that SBS restraint setup rest with the worse situation, for example, the longest distance &... -
Page 16: Sbs Adjustment Process
E: Press STATUS button again for confirmation. VI. EQUIPMENT OPERATION PRINCIPLE OTM-1550/1550L series 1550 nm optic transmitter principle frame as picture 18 stated. Input RF signal is verified at AGC circuit unit and affect on optic modulator to modulate the CW ligly, which is output from 1550nm laser module. -
Page 17: Fault Disposal
Operation Manual / OTM-1550/1550L The non-linearity of optic modulator is inherent. If there is no compensation, the distortion & intercrossing modulated of modulator will let the signal cannot be applied. Generally, the inherent distortion can be modified by adding DC deflected voltage on modulator crystal. For... -
Page 18: Warning Status
Operation Manual / OTM-1550/1550L 7.1 Warning status When TX is on warning status, the status LED will turn red and the brief note of status will be displayed on the screen. The warning will not stop the TX running, it only shows the relative parameter exceeding to normal scope sliglyly. -
Page 19: Alarm Status
Operation Manual / OTM-1550/1550L 7.2 Alarm status When the TX send out warning, it is stopped working generally. The alarm is because of some relative parameter exceeding its safety working scope or some situation causes damage to the laser. Some alarm could be eliminated by restart the power supply or reset the keyswitch. -
Page 20: Guaranteed Repair Range For Product
Operation Manual / OTM-1550/1550L In order to prevent this situation, please use the EDFA with optic isolator. Similarly, the TX output ligly also exists reflection or un-matching to the optic connector. Generally, the reflect ligly of entering optic TX output port can not exceed –25dBm. It is better if the reflect will be weaker. -
Page 21: Compensation Range
Operation Manual / OTM-1550/1550L confirmation from the user, then we go to repair the machine. c. The product after repair has the same quality guaranty term. It has guaranty treatment 90 days after receiving the goods. 8.3 Compensation range If the products meet below problem, we will compensate for the customer. We disobey the order, contact and other stipulation on the contract;...
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