Operation Guide & Troubleshooting for Optical Transmitters & Amplifiers in Optical Equipment Series
1. Installation and Commissioning
(1) Unpacking Inspection
- Verify the integrity of outer packaging before unpacking. Contact your local distributor or carrier promptly if the package is damaged or stained with water marks.
- After unpacking, check all equipment and accessories against the packing list. Reach out to your local distributor or our company immediately if any shortage or damage is found.
- Do not power on the unit if visible damage is spotted after unpacking, to prevent further equipment damage or personal injury. Notify your distributor or our company right away.
(2) Required Instruments & Tools
- One optical power meter
- One digital multimeter
- One standard FC/APC or SC/APC fiber test patch cord
- An adequate supply of anhydrous alcohol and medical degreasing cotton
(3) Installation Procedures
- Read the User Manual thoroughly prior to installation and follow specified operating procedures strictly.Note: Our company shall bear no liability and reject free warranty for equipment damage or consequential faults caused by improper installation not in compliance with manual specifications.
- Take the device out of carton, fix it onto equipment rack and implement reliable earthing with grounding resistance below 4 Ω.
- Test supply voltage with digital multimeter to confirm compliance; ensure the power key switch stays at OFF position before connecting mains power.
- Connect optical input per on-screen prompts then switch on power. Check front-panel indicator lamps. The unit enters normal operation once the PUMP indicator turns green.Exception for V6.0F high-power optical amplifiers: output power rises gradually within approx. 30 seconds.Access all operating parameters via front-panel menu buttons after stabilization.
- Link optical power meter to equipment optical output via standard test patch cord. Confirm measured output matches panel reading and meets rated specification.Measurement prerequisites: set power meter to 1550 nm wavelength range, use qualified standard patch cord and ensure clean connector end-faces.Remove test cords and power meter, then integrate the amplifier into live network to finish commissioning.
Important Tip: Connect output test patch cord to power meter while equipment is powered off before switching on supply, to avoid burning output fiber end-faces due to misoperation (detailed in maintenance section below).
2. Fault Diagnosis & Troubleshooting
Fiber amplifier faults fall into two main categories: abnormal input optical power (dominant for system indicators) and abnormal output optical power.
(1) Abnormal Input Optical Power
Recommended input level: +6~+7 dBm for 1st-stage amplifiers; 0~+3 dBm for 2nd-stage amplifiers.Without an optical power meter, check real-time input power data on the amplifier’s built-in menu.Note: Menu location varies across firmware versions.
(2) Abnormal Output Optical Power
Subdivided into zero output power and insufficient output power; troubleshooting table as below:
表格
| Fault Symptom | Inspection Item | Judgment Criteria | Remedial Action |
|---|---|---|---|
| No optical output | Power supply status | Front-panel POWER LED lit green = normal; off = faulty. Built-in switching PSU also has indicator lamp for verification | Replace hot-pluggable switching power supply directly |
| Valid input optical signal | Menu shows input >+9.99 dBm or <-9.99 dBm = abnormal; test via power meter if available. No measured input may stem from damaged flange adapter | Replace faulty adapter; wipe internal & external fiber end-faces with alcohol after power-off | |
| Damaged output flange adapter | Test internal patch cord behind removable flange bracket without opening chassis | Replace output flange | |
| Pump source disabled via software (only V5.87 firmware, from accidental manual setting) | Access relevant menu option | Switch pump status to ON | |
| Low output power | Dirty output flange | Panel reading normal but actual measured output low with valid input power | Clean or replace flange |
| Contaminated internal output patch cord end-face | Clean fiber end-face (refer to Clause 3 for cleaning steps) | ||
| Dirty external test patch cord | Clean connector end-face | ||
| Burned internal output end-face | All above checks passed yet power remains insufficient | Open top cover, cut defective internal pigtail and re-splice new fiber pigtail with fusion splicer |
(3) Cleaning & Maintenance for Fiber Connectors
Low output power is frequently mistaken for equipment failure while the root cause lies in contaminated fiber connectors. Standard cleaning steps as follows:
- Cut off equipment power and carefully unscrew fiber connector from adapter.
- Wipe end-face with premium lens tissue or alcohol-dampened medical cotton; wait 1~2 minutes for full alcohol evaporation after alcohol cleaning.
- Reconnect cleaned connector to optical power meter to verify recovered output power.
- Install cleaned connector back into adapter with moderate force to avoid cracking adapter ceramic sleeve.
- Re-dismantle and clean the inner-side connector behind adapter if output remains abnormal after first cleaning; clean the adapter body if issue persists.Caution: Dismantle adapters gently to avoid damaging internal fiber.
- Clean adapter ceramic bore with compressed air spray or alcohol cleaning stick: inject compressed air straight into bore or feed alcohol stick through sleeve in consistent insertion direction for optimal cleaning effect.
Special Safety Precautions
a. Never point live optical connector toward human eyes or skin during cleaning; high-power laser may cause permanent eye injury.b. Apply moderate torque when fitting fiber plugs; cracked adapter ceramic tube causes severe power drop and drastic power fluctuation with slight connector rotation.c. Always shut down pump laser before any fiber handling; energized high-power output burns fiber end-face and triggers permanent output attenuation.
