4 Channels Double Fiber Passive DWDM Line Termination Unit

# Key Highlights
  • Line Termination of 4 Links
  • Fully Passive: No Power Supply or Cooling
  • MTBF: 100+ Years
  • Protocol & Data Rate neutral
  • Low Insertion Loss – 1.5 dB
  • Compact: LGX Type B package
  • Easy Installation & Expansion
  • 5 Year Warranty
# Pricing & Ordering


Standard recommended retail price without VAT.

Lead Time: Below 1 Week in EU Countries
# Quality Assurance

Because of our comprehensive Testing Program, we are confident on quality of our products. Such approach empower us to cover all our products with:

DDLT-4 Front Panel

# Key Technical Data
Product Type:

DWDM One Side (Line Termination) OADM

Number of Data Streams:


Number of Optical Channels:

4 DWDM Channels According ITU-T ITU G.694.1

DWDM Add/Drop Channels:

Ch 21/22/23/24, Ch 25/26/27/28, Ch 29/30/31/32, Ch 33/34/35/36, Ch 37/38/39/40, Ch 41/42/43/44, Ch 45/46/47/48, Ch 49/50/51/52, Ch 53/54/55/56, Ch 57/58/59/60

Filter Technology:

TFF (Thin Film Filter)


± 0.1 nm (λ center)

Channel Spacing:

0.8 nm

Insertation Loss (Add/Drop Channels):

1.5 dB

Insertation Loss (Express):

1.0 dB

Isolation Adjacent Channels:

25 dB

Isolation Non-Adjacent Channels:

30 dB

Channel Pass-band Ripple:

0.75 dB

Polarization Dependent Loss (PDL):

Max: 0.5 dB

Polarization Mode Dispersion (PMD):

Max: 0.5 ps/nm


Min: 21 dB

Return Loss:

Min: 40 dB

Maximum Power Handling:

23 dBm on common port


LC Adapters for use with TIA/EIA 604-10 compliant LC UPC Connectors

Operating Temperature:

-5~+70 (°C)

Storage Temperature:

-40~+85 (°C)

Relative Humidity:

0 – 90%


CE, ISO, ITU-T G.694.1, RoHS, Telecordia GR-20

# Product Documentation
# Product Description

4 Channels Double Fiber Passive DWDM Line Termination Unit – DDLT-4 is member of EDGE Optics xWDM Series product line. We designed EDGE Optics xWDM Series products to allow easy, gradual, logical and cost efficient expansion of network bandwidth using industry leading passive WDM technology. Main advantage of xWDM is its passive nature – no power supply or cooling necessary, robustness – no special micro-climate requirements and as passive element, it has MTBF 100+ Years. xWDM is – it is fully data rate or line protocol neutral – it is possible to use with colored transceivers supporting such applications as 1G/10G Ethernet, SDH/SONET and 8/4/2/1G Fiber Channel. It’s simple to install, requires no configuration or maintenance.
DDLT-4 is passive double fiber 1-side Optical Add-Drop Multiplexer (OADM) package based on Thin-Film Filter (TFF) technology, allowing extract 4 data streams from ITU-T G.694.1 compatible Dense Wavelength Division Multiplex (DWDM). DDLT-4 acts as one side termination unit, meaning that link with is extracted in site where DDLT-4 is installed, is not added towards other side of DWDM link. DDLT-4 is manufactured as LGX type B module, installed in 19” 1U sub rack fitting any standard equipment rack.