100G ZR Single-Fiber Dual-Laser QSFP28 DCO Transceiver: 100G-Q28-DCO-ZRSF
100G ZR Single-Fiber Dual-Laser QSFP28 DCO Overview
The 100G-Q28-DCO-ZRSF is a tunable 100G ZR dual-laser coherent QSFP28 DCO module built for single-fiber transmission. Its transmit laser and receive local oscillator tune independently across the full C-band on a 50GHz grid (channels 13.5-61, 96 channels total) at 27.95 GBd DP-DQPSK, so each direction can run on its own wavelength and share a single strand of SMF through an external circulator or a single-fiber DWDM mux at each end. This is not a BiDi module in the traditional WDM sense: there is no built-in optical filter and no Side A/B designation, and the port itself is duplex LC. Single-fiber coherent modules of this kind are nonetheless sometimes marketed as a "BiDi DCO," since they achieve bidirectional transmission over one fiber using two independently tunable lasers rather than a filter. Reach is up to 80km unamplified, 120km amplified, and up to 300km with amplification and the extended chromatic-dispersion mode enabled (6.0 ns/nm, +0.2W). OSNR tolerance is 16.5dB/12.5GHz and end-to-end latency is 24 microseconds or less. Application (100GBASE-ZR or OTU4) is selected via CMIS, and the module meets IEC 62368-1 and is aligned with ITU-T G.698.2. The host port must support 7W QSFP28 modules, CMIS, and the module's extended front section (QSFP-DD Type 2A profile outside the cage). Compatibility with specific host platforms is available on request.
- Media Type: Single-Mode Fiber (SMF)
- Connector: Double LC/UPC
- Fiber Count: Duplex
- Maximum Distance: 300 km
- Average Link Budget: 23.5 dB
- Tx Wavelength: DWDM 96Ch (C-band 50Ghz)
- Supported Data Rate: 103.125 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Built-in FEC
- Temperature Range: Standard 0°-70°C
100G ZR Coherent QSFP28 DCO Pricing
SKU:100G-Q28-DCO-ZRSF-MS100G-Q28-DCO-ZRSF-MS
Special Order - Up to 4 WeeksSpecial Order - Up to 4 Weeks100G ZR Single-Fiber Dual-Laser QSFP28 DCO Transceiver Specification
Form Factor | QSFP28 |
Modulation | DP-DQPSK (Dual Polarization Differential Quadrature Phase Shift Keying) |
Media Type | Single-Mode Fiber (SMF) |
Connector | Double LC/UPC |
Fiber Count | Duplex |
Maximum Distance | 300 km |
Average Link Budget | 23.5 dB |
TX Wavelength | C-Band DWDM (Ch.13.5-61, 50GHz) |
RX Wavelength | C-Band DWDM (Ch.13.5-61, 50GHz) |
Supported Data Rate | 103.125 Gbps |
Supported Ethernet Applications | 100G Ethernet (103.125 Gbps) |
Optical Transport Network (OTN) Applications | OTU4 (112 Gbps) |
DDM/DOM | Supported |
Forward Error Correction (FEC) | Built-in FEC |
Transmitter Type | Dual tunable laser |
Tx Wave Bandwidth | 50 GHz grid (±1.8 GHz tuning accuracy) |
Average Launch Power (Min) Each Lane | -8 dBm |
Average Launch Power (Max) Each Lane | -5 dBm |
Receiver Type | ICR |
RX Wave Bandwidth | 50 GHz grid (±1.8 GHz tuning accuracy) |
Average Receiver Sensitivity (Min) Each Lane | -31.5 dBm |
Average Receiver Sensitivity (Max) Each Lane | 1 dBm |
Receiver Overload | 3 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 7 W |
Power | +3.3V single power supply |
Compliance | RoHS, IEEE 802.3-2022 100GBASE-ZR, ITU-T G.709.2, Class 1 FDA and IEC60825-1 Laser Safety Compliant, CMIS V5.2, OIF Coherent CMIS |
100G ZR Single-Fiber Dual-Laser QSFP28 DCO Transceiver Datasheet
v7Complete technical specifications and product details
100G ZR Single-Fiber Dual-Laser QSFP28 DCO Transceiver Description
The coherent engine pairs two independently tunable C-band lasers (transmitter + receiver local oscillator) with a coherent receiver, modulating DP-DQPSK at 27.95 GBd with built-in staircase FEC per the IEEE 802.3-2022 100GBASE-ZR specification. Average launch power spans −8 to −5 dBm per lane, and receiver sensitivity is −31.5 dBm per lane, the basis for the 23.5 dB average link budget. Receiver overload is capped at 3 dBm, so amplified spans may need inline attenuation.
OSNR tolerance is 16.5 dB over a 12.5 GHz reference bandwidth, the limiting factor on amplified and extended-reach spans as accumulated noise narrows the margin. End-to-end latency stays at 24 microseconds or less, relevant for latency-sensitive coherent links such as data center interconnect. The extended chromatic-dispersion mode is optional and disabled by default; when enabled, it raises tolerance to 6.0 ns/nm at the cost of an additional 0.2W, removing the dispersion limit on amplified spans so the link can reach the 300km tier.
Application mode, 100GBASE-ZR (103.125 Gbps) or OTU4 (112 Gbps), is selected via CMIS 5.2 and OIF Coherent CMIS, so the same hardware supports either an Ethernet or an OTN deployment. The module runs over 0 to 70°C at up to 7W from a single +3.3V rail, and meets IEEE 802.3-2022 100GBASE-ZR, ITU-T G.709.2, RoHS, and Class 1 laser safety under FDA and IEC 60825-1. The host cage must accept 7W QSFP28 modules, support CMIS, and clear the extended front section, following the QSFP-DD Type 2A outline beyond the cage opening.
This module carries EDGE Optical Solutions' standard 5-year warranty against defects in materials and workmanship. Host platform compatibility is available on request; for platform-specific pairing questions, contact our sales team.
Frequently Asked Questions
Is the 100G-Q28-DCO-ZRSF a BiDi transceiver?
Not in the classic sense. Classic BiDi modules use a built-in WDM filter, fixed wavelengths and Side A/B pairs. This module uses two tunable lasers and a duplex LC port; single-fiber operation is done with an external circulator or mux. It's sometimes called a "BiDi DCO" in the market for that reason.
How does a duplex LC module support single-fiber transmission?
The transmit laser and the receive local oscillator tune independently to different ITU-T DWDM channels, so each direction of the link runs on its own wavelength. An external circulator or a single-fiber DWDM mux at each end combines and separates those wavelengths onto one strand of single-mode fiber.
Can the transmit and receive sides tune to different DWDM channels?
Yes. Both the transmit laser and the receive local oscillator (two independently tunable C-band lasers) tune independently across the C-band on a 50 GHz grid, ITU-T channels 13.5 to 61, 96 channels in total, with a tuning accuracy of plus or minus 1.8 GHz. That independent tuning is what lets transmit and receive run on separate wavelengths over a shared fiber.