40 Channels Double Fiber Passive 100 GHz DWDM Coherent Mux/Demux: DDMD-40COH
Panel preview
Schematic representation showing exact port count and wavelength configuration. Front panel updates as you configure.
DDMD-40COH-U
40-Channel 100GHz Coherent DWDM Mux/Demux Overview
The DDMD-40COH is a 40-channel double fiber 100 GHz DWDM multiplexer/demultiplexer for coherent transceivers such as 400G ZR, ZR+ and OpenZR+. It covers the full ITU-T G.694.1 C-band grid from Ch.21 to Ch.60 (1560.61 to 1529.55 nm) with flat-top athermal AWG (AAWG) filters, keeping at least 50 GHz within 1 dB and at least 76 GHz within 3 dB on every channel. It mounts in a 19 inch 1U rack space with LC/UPC connectors, needs no power, and has a line port and a duplex monitor port.
- xWDM Technology: DWDM
- Package Type: 1U Rack Mount
- Number of Data Streams: 40
- Number of Optical Channels: 40
- Connector: LC/UPC
- Filter Technology: Flat-Top AAWG (athermal)
- Insertation Loss (Passband): 5.5 dB
- Operating Temperature: 0 °C - 70 °C
- MTBF: 1000000 hours
DDMD-40COH Configurator & Pricing
Configure your product below — the price, SKU and images update with every choice.
Review your configuration
- Channel (DWDM)
- Ch.21-60 (-2160)Ch.21-60 (-2160)
DDMD-40 100GHz DWDM Pricing
SKU:DDMD-40COH-UDDMD-40COH-U
Special Order - Up to 4 WeeksSpecial Order - Up to 4 Weeks40 Channels Double Fiber Passive 100 GHz DWDM Coherent Mux/Demux Specification
Product Type | DWDM MUX/DEMUX Unit |
Package Type | 1U Rack Mount |
Number of Data Streams | 40 |
Number of Optical Channels | 40 |
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 | ≥0.40 nm (50 GHz) at −1 dB, ≥0.61 nm (76 GHz) at −3 dB |
Filter Technology | Flat-Top AAWG (athermal) |
Insertation Loss (Passband) | 5.5 dB |
Insertion Loss (1% Monitor Port) | 23 dB |
Monitoring Port Type | 1% Monitoring Port |
Isolation Adjacent Channels | 25 dB |
Isolation Non-Adjacent Channels | 30 dB |
Channel Pass-band Ripple | 0.5 dB |
Polarization Dependent Loss (PDL) | 0.3 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, RoHS, ITU-T G.694.1 |
40 Channels Double Fiber Passive 100 GHz DWDM Coherent Mux/Demux Datasheet
v2Complete technical specifications and product details
40 Channels Double Fiber Passive 100 GHz DWDM Coherent Mux/Demux Description
The DDMD-40COH is a 40-channel, 100 GHz, passive coherent DWDM multiplexer/demultiplexer for double fiber (duplex) deployment, covering the full ITU-T G.694.1 C-band grid from Ch.21 to Ch.60 (1560.61 to 1529.55 nm). It is built for coherent DCO transceivers such as 400G ZR, ZR+ and OpenZR+, which carry a signal about 60 GHz wide in each 100 GHz channel.
Filtering uses a flat-top athermal AWG: at least 50 GHz (0.40 nm) within 1 dB and at least 76 GHz (0.61 nm) at −3 dB per channel, with passband ripple of 0.5 dB or less. Insertion loss is below 5.5 dB and nearly uniform across all 40 channels. Adjacent channel isolation is at least 25 dB, non-adjacent at least 30 dB. Connectors are LC/UPC.
Housing is 19 inch 1U. A duplex 1% monitoring port taps both line directions for non-intrusive power and spectrum checks. There is no EXP port, since the unit already covers the full C-band grid. A Mux + Demux pair adds up to 11 dB, so the DDMD-40COH suits amplified links and high channel counts; for short unamplified links with a few channels, the DDMD-4COH or DDMD-8COH has lower loss.
Frequently Asked Questions
What is the difference between the DDMD-40COH and the standard DDMD-40?
Both cover Ch.21-60 on one 1U chassis. The DDMD-40COH uses a flat-top AWG wide enough for ~60 GBd coherent signals (at least 76 GHz at −3 dB); the standard DDMD-40 uses a Gaussian AWG designed for 10G NRZ. The DDMD-40COH has higher insertion loss (below 5.5 dB vs 3.7 dB).
Is the DDMD-40COH suitable for unamplified links?
On short links, yes, if the module power budget allows it: a Mux + Demux pair adds up to 11 dB before fiber loss. For unamplified links with a few channels, the DDMD-4COH or DDMD-8COH has lower loss. On amplified links the higher loss is not a concern.
Why AAWG instead of TFF?
AWG loss does not grow with channel count, so all 40 channels have nearly the same insertion loss. A 40-filter TFF cascade would have higher loss on the last channels. For 4 or 8 channels, TFF has lower loss, which is why the DDMD-4COH and DDMD-8COH use it.
Does the DDMD-40COH have an EXP expansion port?
No. The unit already covers the full C-band grid from Ch.21 to Ch.60, so no EXP port is needed.
Are connector types other than LC/UPC available?
LC/UPC is standard. SC and APC are available as special order through our sales team.