DWDM Network Expansion: 40-CH MUX, EDFA & OCM for Multi-Terabit Fiber Capacity

Time: 2026-06-18 16:34:54

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SOLUTION

DWDM Network Expansion: 40-CH MUX, EDFA & OCM for Multi-Terabit Fiber Capacity

When fiber pairs are exhausted and laying new cable is not an option, DWDM unlocks 40 wavelengths per fiber pair. Apex delivers a complete passive + active DWDM solution — MUX/DEMUX, EDFA amplification, dispersion compensation, and optical channel monitoring — engineered for rapid deployment on existing fiber plant.

40λCHANNELS PER FIBER PAIR

100 GHzGRID SPACING

32 TbpsMAX CAPACITY (800GX40)

1The Challenge

Fiber exhaust is the most expensive capacity bottleneck in optical networking:

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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.

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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.

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Span Loss Budgeting

Every DWDM channel adds insertion loss through the MUX. Amplification and dispersion compensation must be engineered per span.

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Channel Visibility

Without optical channel monitoring, a degrading wavelength takes hours to locate. OCM provides per-channel power telemetry in real time.

2DWDM Architecture

┌───────────────────────────────────────────────────────┐
│ Step 1: Multiplex │
│ 40× 800G/400G/100G Transceivers → 40-CH DWDM MUX │
│ C-band, 100 GHz grid, 1528.77 – 1567.13 nm │
├───────────────────────────────────────────────────────┤
│ Step 2: Amplify │
│ EDFA Booster → Fiber Span → EDFA Pre-Amplifier │
│ Compensate 20-30 dB span loss per 80 km │
├───────────────────────────────────────────────────────┤
│ Step 3: Compensate (optional, > 80 km spans) │
│ Dispersion Compensation Module (DCM) │
│ Correct chromatic dispersion for 10G-100G channels │
├───────────────────────────────────────────────────────┤
│ Step 4: Monitor │
│ Optical Channel Monitor (OCM) │
│ Real-time per-λ power, OSNR, and wavelength drift │
├───────────────────────────────────────────────────────┤
│ Step 5: Demultiplex │
│ 40-CH DWDM DEMUX → Individual λ to transceivers │
└───────────────────────────────────────────────────────┘

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

3Key Benefits

40x

Capacity multiplication on one fiber pair

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

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.

4Deployment Scenario: 4-Site Metro DWDM Ring

A telecom operator connecting four metro sites with a single fiber pair per span, 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[email protected]

WHATSAPP / PHONE+852 9821 3834

WEBSITEapexallinone.com

Article Tags：

DWDM expansion 40-channel MUX EDFA amplifier dispersion compensation optical channel monitor fiber exhaust C-band DWDM 100 GHz grid multi-terabit DCM OSNR monitoring

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