1 Channel Double Fiber Passive DWDM Line Termination Unit: DDLT-1
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Schematic representation showing exact port count and wavelength configuration. Front panel updates as you configure.
DDLT-1-21-31-M
1-Channel Double Fiber DWDM Line Termination Overview
DDLT-1 is a passive one-sided Optical Add-Drop Multiplexer (OADM) extracting a single 100 GHz DWDM channel from a double-fiber DWDM link; the channel is not added back on the far side. The unit configures by housing (mini-LGX or LGX), DWDM channel (any ITU-T G.694.1 100 GHz channel from Ch.21 to Ch.60), and an optional 1310nm window port, with LC/UPC connectors throughout. Each configuration resolves to its own orderable SKU and price.
- xWDM Technology: DWDM
- Number of Data Streams: 1
- Number of Optical Channels: 1
- Connector: LC/UPC
- Filter Technology: TFF (Thin Film Filter)
- Insertation Loss (Passband): 1 dB
- Operating Temperature: 0 °C - 70 °C
- MTBF: 1000000 hours
DDLT-1 Configurator & Pricing
Configure your product below — the price, SKU and images update with every choice.
Review your configuration
- Housing
- mini-LGX Type (-M)mini-LGX Type (-M)
- Channel (DWDM)
- Ch.21 (-21)Ch.21 (-21)
- Window Port
- YesYes
- EXP Expansion Port
- NoNo
- Window Port Insertion Loss
- 1.0 dB1.0 dB
- Added Passband Insertion Loss
- +0.3 dB+0.3 dB
DDLT-1 DWDM Line Termination Pricing
SKU:DDLT-1-21-31-MDDLT-1-21-31-M
Special Order - Up to 4 WeeksSpecial Order - Up to 4 Weeks1 Channel Double Fiber Passive DWDM Line Termination Unit Specification
Product Type | OADM Unit |
Number of Data Streams | 1 |
Number of Optical Channels | 1 |
Connector | LC/UPC |
Operating Wavelengths | 40 DWDM Channels 100 GHz Ch 21-60 (1560.61-1529.55nm) |
Channel Spacing | 100 GHz (0.8 nm) |
Passband | >0.22 nm |
Filter Technology | TFF (Thin Film Filter) |
Insertation Loss (Passband) | 1 dB |
Isolation Adjacent Channels | 30 dB |
Isolation Non-Adjacent Channels | 40 dB |
Channel Pass-band Ripple | 0.5 dB |
Polarization Dependent Loss (PDL) | 0.1 dB |
Polarization Mode Dispersion (PMD) | 0.1 ps |
Return Loss | 45 dB |
Maximum Power Handling | 500 mW |
Operating Temperature | 0 °C - 70 °C |
Operating Humidity | 5 % - 95 % |
Storage Temperature | -40 °C - 85 °C |
MTBF | 1000000 hours |
Compliance | CE, ISO, ITU-T G.694.1, RoHS |
1 Channel Double Fiber Passive DWDM Line Termination Unit Datasheet
v5Complete technical specifications and product details
1 Channel Double Fiber Passive DWDM Line Termination Unit Description
DDLT-1-CFG is a passive, one-sided DWDM line termination unit that drops a single wavelength from a double-fiber DWDM link. The selected channel is extracted at the installation site only; it is not added back onto the express, through-path fiber toward the far side. This one-sided behavior is what separates the DDLT-1 from a two-sided optical add-drop multiplexer, which adds and drops channels at both ends of the same span.
The unit selects one channel from the ITU-T G.694.1 fixed grid, 40 channels at 100 GHz spacing across Ch.21 through Ch.60, 1560.61 nm to 1529.55 nm. Filtering uses thin film filter (TFF) technology with a passband greater than 0.22 nm, 25 dB isolation on adjacent channels, 35 dB on non-adjacent channels, 0.5 dB passband ripple, 0.1 dB PDL, 0.1 ps PMD and 45 dB return loss.
Two configuration choices are made at the time of order. Housing is mini-LGX or LGX, a mechanical and footprint decision that does not change the optical specifications. An optional 1310 nm window port is also available for out of band monitoring. Without the window port, insertion loss stays below 1.0 dB on the main path and below 0.8 dB on the express path. Adding the window port raises insertion loss to below 1.3 dB on the main path and below 1.0 dB on the express path. An expansion port is not offered on this configuration; connectors are LC/UPC throughout.
As a passive wavelength selective filter, the DDLT-1 has no electronics and needs no power; the selected channel is fixed at the time of configuration, and transmission is independent of the data rate or protocol carried on the fiber. Maximum power handling is 500 mW. Operating range is 0 to 70°C at 5 to 95 percent humidity, storage is −40 to 85°C, and MTBF is 1,000,000 hours. Compliance covers CE, ISO, ITU-T G.694.1 and RoHS.
Frequently Asked Questions
What is the difference between the DDLT-1 and a two-sided DWDM OADM?
The DDLT-1 is a one-sided line termination unit. It drops the selected channel at the site where it is installed, and that channel is not added back onto the express, through-path fiber toward the far side. A two-sided DWDM OADM adds and drops channels at both ends of the same span, giving bidirectional add and drop at a single location. Confirm which behavior a deployment needs before ordering, since a one-sided unit dropped in place of a two-sided OADM will not re-insert the channel toward the far end.
Which DWDM channels can be selected on the DDLT-1, and what standard defines the grid?
The DDLT-1 is configured to one of 40 individually selectable channels on the ITU-T G.694.1 fixed 100 GHz grid, spanning Ch.21 through Ch.60, 1560.61 nm to 1529.55 nm. Only one channel is active per unit. The channel is fixed at the time of order and is not field-selectable afterward.
Should I choose mini-LGX or LGX housing for the DDLT-1?
Housing is a mechanical and footprint decision only. Mini-LGX and LGX versions of the DDLT-1 share identical optical specifications, including passband, insertion loss and isolation. The choice depends on the rack or panel space available, not on optical performance.
Does adding the 1310 nm window port change insertion loss?
Yes. Without the window port, insertion loss stays below 1.0 dB on the main path and below 0.8 dB on the express, through path. Adding the optional 1310 nm window port raises insertion loss to below 1.3 dB on the main path and below 1.0 dB on the express path. The window tap adds this fixed loss penalty regardless of housing choice.
Does the DDLT-1 require power to operate?
No. The DDLT-1 is a passive device built on thin film filter (TFF) technology, with no electronics and no power input. The channel it drops is fixed by the filter selected at the time of configuration, and the unit continues to operate as long as optical power on the fiber stays within its 500 mW maximum power handling rating.