Solutions & Applications
Telecom Network Sync · 5G Infrastructure · Data Center Connectivity · Optical Networks · Critical Networks
40λChannels Per Fiber Pair
100 GHzGrid Spacing
32 TbpsMax Capacity (800G×40)
1. The Challenge
Fiber Exhaust
Running out of fiber pairs between sites. Laying new fiber costs $50,000–250,000 per km with 12–18 month permitting timelines.
Underutilized Strands
A single 10G or 100G link per fiber strand wastes 99% of the fiber's theoretical THz bandwidth. DWDM fills the unused spectrum.
Span Loss Budgeting
Every DWDM channel adds insertion loss through the MUX. Amplification and dispersion compensation must be engineered per span.
Channel Visibility
Without optical channel monitoring, a degrading wavelength takes hours to locate. OCM provides per-channel power telemetry in real time.
2. DWDM Architecture
Multiplex: 40× 800G/400G/100G Transceivers → 40-CH DWDM MUX (C-band, 100 GHz grid, 1528.77–1567.13 nm)
Amplify: EDFA Booster → Fiber Span → EDFA Pre-Amplifier. Compensate 20–30 dB span loss per 80 km
Compensate (optional, >80 km spans): Dispersion Compensation Module (DCM). Correct chromatic dispersion for 10G–100G channels
Monitor: Optical Channel Monitor (OCM). Real-time per-λ power, OSNR, and wavelength drift
Demultiplex: 40-CH DWDM DEMUX → Individual λ to transceivers
3. Product Selection Matrix
| Function | Product | Form Factor | Key Spec |
|---|---|---|---|
| Mux/Demux | 40-CH DWDM MUX/DEMUX | 1RU passive | 100 GHz grid, IL < 5.5 dB, C-band |
| Amplifier | EDFA Booster Amplifier | 1RU active | 20 dBm output, gain 15–25 dB |
| Amplifier | EDFA Pre-Amplifier | 1RU active | -30 dBm input sensitivity, gain 25–35 dB |
| DCM | Dispersion Compensation Module | 1RU passive | -340 to -1360 ps/nm, G.652 matched |
| Monitoring | Optical Channel Monitor (OCM) | 1RU active | ±0.5 dB accuracy, per-λ power + OSNR |
| Transceivers | 800G ZR+ / 400G DCO / 100G DWDM | QSFP-DD / CFP2 / QSFP28 | DWDM-tunable, 50/100 GHz grid |
4. Key Benefits
40× capacity multiplication on one fiber pair
$0 new fiber trenching cost — all passive, no civil works
32 Tbps theoretical max with 40×800G ZR+ per fiber pair
2 days typical rack-and-stack deployment time
5. Why Apex
| Capability | Why Apex |
|---|---|
| Pre-wired LGX panels | 40-CH MUX/DEMUX ships pre-terminated on LGX cassettes with LC/UPC adapters. Rack, plug patch cords, light — no field splicing. |
| Span budget calculator | Free DWDM link budget spreadsheet: input fiber length, loss per km, connector count — outputs EDFA gain settings and channel power. |
| Full passive + active portfolio | Single supplier for MUX, EDFA, DCM, OCM, and DWDM transceivers. One compatibility matrix, one support contact. |
| In-stock delivery | 40-CH MUX, EDFA, and DCM ship from inventory. 800G ZR+ DWDM-tunable transceivers available for same-day dispatch. |
6. Deployment Scenario: 4-Site Metro DWDM Ring
A telecom operator connecting four metro sites, upgrading from 10×10G to 40×100G DWDM:
| Parameter | Before (10×10G) | After (40×100G DWDM) | Delta |
|---|---|---|---|
| Total capacity per span | 100 Gbps | 4 Tbps | 40× |
| Fiber pairs used | 10 | 1 | −9 pairs freed |
| Active equipment | 20× SFP+ LR | 40× 100G DWDM QSFP28 + 1× 40-CH MUX + 2× EDFA | Consolidated |
| Per-wavelength visibility | None (switch port only) | Real-time OCM per λ | 40× monitoring points |
Running out of fiber capacity?
Our DWDM engineers will audit your fiber plant, compute span budgets, and deliver a complete MUX+EDFA+DCM BOM with channel power plan — typically within 48 hours.
Email: Info@apexallinone.com | WhatsApp/Phone: +852 9821 3834
