8-Channel Double Fiber 100 GHz DWDM Coherent Mux/Demux: DDMD-8COH
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DDMD-8COH-2128-L
8-Channel Double Fiber 100 GHz DWDM Coherent Mux/Demux Overview
The DDMD-8COH is an 8-channel double fiber 100 GHz DWDM multiplexer/demultiplexer for coherent transceivers such as 400G ZR, ZR+ and OpenZR+, covering the ITU-T G.694.1 C-band grid from Ch.21 to Ch.60, sold as one of five fixed 8-channel band groups (Ch.21-28, Ch.29-36, Ch.37-44, Ch.45-52, Ch.53-60). Its wide-passband flat-top thin film filters keep a flat passband of at least 45 GHz and a −3 dB width of at least 75 GHz on every channel, so ~60 GBd coherent signals pass without spectral clipping. It ships in LGX housing with LC/UPC connectors, a duplex monitor port and an EXP expansion port for cascading further coherent mux/demux units.
- xWDM Technology: DWDM
- Package Type: LGX Cassette
- Number of Data Streams: 8
- Number of Optical Channels: 8
- Connector: LC/UPC
- Filter Technology: Wide-Passband Flat-Top TFF
- Insertation Loss (Passband): 3 dB
- Operating Temperature: 0 °C - 70 °C
- MTBF: 1000000 hours
DDMD-8COH Configurator & Pricing
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- Channel (DWDM)
- Ch.21-28 (-2128)Ch.21-28 (-2128)
DDMD-8COH-2128 Modular DWDM Pricing
SKU:DDMD-8COH-2128-LDDMD-8COH-2128-L
Special Order - Up to 4 WeeksSpecial Order - Up to 4 Weeks8-Channel Double Fiber 100 GHz DWDM Coherent Mux/Demux Specification
Product Type | DWDM MUX/DEMUX Unit |
Package Type | LGX Cassette |
Number of Data Streams | 8 |
Number of Optical Channels | 8 |
Connector | LC/UPC |
Operating Wavelengths | 8 of 40 selectable 100 GHz DWDM channels (ITU-T C-band, Ch.21 to Ch.60, 1529.55-1560.61nm), offered in 5 fixed 8-channel bands: Ch.21-28, Ch.29-36, Ch.37-44, Ch.45-52, Ch.53-60 |
Channel Spacing | 100 GHz (0.8 nm) |
Passband | ≥0.36 nm (45 GHz) at −0.5 dB, ≥0.60 nm (75 GHz) at −3 dB |
Filter Technology | Wide-Passband Flat-Top TFF |
Insertation Loss (Passband) | 3 dB |
Insertion Loss (Upgrade/Expansion) | 1.8 dB |
Insertion Loss (1% Monitor Port) | 23 dB |
Monitoring Port Type | 1% Monitoring Port |
Isolation Adjacent Channels | 30 dB |
Isolation Non-Adjacent Channels | 45 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 |
8-Channel Double Fiber 100 GHz DWDM Coherent Mux/Demux Datasheet
v3Complete technical specifications and product details
8-Channel Double Fiber 100 GHz DWDM Coherent Mux/Demux Description
The DDMD-8COH is an 8-channel, 100 GHz, passive coherent DWDM multiplexer/demultiplexer for double fiber (duplex) deployment, with all 8 channels on one fiber pair. It covers 8 of the 40 selectable 100 GHz ITU-T G.694.1 C-band channels from Ch.21 to Ch.60 (1529.55 to 1560.61 nm), sold as one of 5 fixed 8-channel bands: Ch.21-28, Ch.29-36, Ch.37-44, Ch.45-52 and Ch.53-60. 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 wide-passband flat-top thin film filter (TFF) technology: the passband is at least 45 GHz (0.36 nm) wide at −0.5 dB and at least 75 GHz (0.60 nm) at −3 dB, compared with about 27 GHz on a standard DWDM filter. Insertion loss is below 3 dB through the passband and below 1.8 dB through the EXP expansion path. Adjacent channel isolation is at least 30 dB, non-adjacent at least 45 dB. Return loss is 45 dB, polarization dependent loss is 0.3 dB, polarization mode dispersion is 0.1 ps. Connectors are LC/UPC.
Housing is LGX. A duplex 1% monitoring port taps both line directions for non-intrusive power and spectrum checks, with about 23 dB insertion loss on the monitor path. An EXP expansion port is included for cascading further units onto the same fiber pair; for 400G channels, connect only COH units on EXP.
Operating temperature is -40 to 85°C at 5 to 95% humidity, storage range is -40 to 85°C. The unit is CE, ISO and RoHS compliant, built to ITU-T G.694.1. For help choosing between the DDMD-4COH, DDMD-8COH and DDMD-40COH, contact our sales team.
Frequently Asked Questions
What is the difference between the DDMD-8COH and the standard DDMD-8?
Both are 8-channel double fiber 100 GHz units on the same channel grid. The DDMD-8COH uses wide flat-top filters (at least 45 GHz at −0.5 dB and 75 GHz at −3 dB) for ~60 GBd coherent signals. The standard DDMD-8 passband (above 0.22 nm, about 27 GHz) is designed for 10G NRZ signals and clips 400G coherent signals.
Which transceivers does the DDMD-8COH support?
400G ZR, ZR+ and OpenZR+ DCO modules, 100G to 300G coherent modules, and standard 10G/25G DWDM transceivers on the channels of the selected band.
Can I connect a standard DDMD unit to the EXP port?
Yes, for 10G channels on other bands. For 400G coherent channels, every mux/demux in the path, including units on the EXP port, must be a COH unit.
Which DWDM channel band should I choose?
Five fixed 8-channel bands are available: Ch.21-28, Ch.29-36, Ch.37-44, Ch.45-52, Ch.53-60. The band is set at manufacture and cannot be tuned in the field. Choose the band that matches the transceiver channels and use a unit with the same band at both ends.
Are connector types other than LC/UPC available?
LC/UPC is standard. SC and APC are available as special order through our sales team.