100G QSFP28 Coherent Transceiver – C-Band, up to 120 km
This 100G QSFP28 coherent transceiver is designed for high-capacity optical transport in modern C-band networks, combining long reach, flexible wavelength tuning, and advanced coherent modulation. Using DP-DQPSK modulation and full C-band tunability, the module enables efficient 100G transmission over distances of up to 120 km on single-mode fiber using EDFA amplification only, without the need for dispersion compensation.
The transceiver complies with QSFP28 standards and supports multiple host interface modes and FEC options, making it suitable for a wide range of applications including metro transport, regional networks, and data center interconnects. With low and predictable latency, strong tolerance to optical impairments, and moderate power consumption, it is well suited for deployment in compact, high-density platforms.
General Specifications
• Form factor: QSFP28 pluggable, SFF-8661 compatible
• Transmission rate: up to 100 Gbps
• Modulation: 28 GBd DP-DQPSK
• Tunable wavelength range: full C-band (191.20–196.15 THz)
• Optical reach: up to 120 km over SMF with EDFA only
• Power consumption: = 5.5 W
• Operating case temperature: 0 °C to 70 °C
• Storage temperature: -40 °C to +85 °C
Transmitter Specifications
• Line bit rate: 111.8 Gbps
• Symbol rate: 27.9525 GBd (±20 ppm)
• Modulation format: DP-DQPSK (IEEE 802.3, Clause 153)
• Optical output power: -8 to -4 dBm
• Power consistency: = 1.5 dB
• Transmitter off power: = -35 dBm
• Side-mode suppression ratio (SMSR): = 30 dB
• Laser linewidth: 500 to 1000 kHz
• Frequency deviation: = 1.8 GHz
• Channel tuning time: = 30 seconds
• Channel grid: ITU-T G.694.1, 50 GHz / 100 GHz spacing, 6.25 GHz flexible grid supported
Receiver Specifications
• Line bit rate: 111.8 Gbps
• Symbol rate: 27.9525 GBd (±20 ppm)
• Input optical power range: -27 to 0 dBm
• Overload level: 3 dBm
• Sensitivity (B2B, power-limited): BER 4.62 × 10³, OSNR 35 dB
• Sensitivity (B2B, OSNR-limited): BER 4.62 × 10³, OSNR 16.5 dB at -16 dBm
• Chromatic dispersion tolerance: up to 2400 ps/nm
• Differential group delay tolerance: 20 ps
• Polarization rotation tolerance: 50 krad/s
• Polarization-dependent loss (PDL) tolerance: 2 dB
• Crosstalk tolerance: 16 dB (inter-channel), 25 dB (interferometric)
FEC and Host Interfaces
• Line FEC support:
o SC-FEC (G.709.2 Annex A/B, 7% overhead)
o GFEC (G.709, 7% overhead)
• Host interface modes:
o CAUI-4 with RS(528,514) KR FEC (optional)
o 100GAUI-4 with RS(544,514) KP FEC
o OTL4.4 with GFEC
Latency
• SC-FEC datapath latency (Tx + Rx): 19.75 µs (CAUI-4 mode)
• GFEC datapath latency (Tx + Rx): 1.6 µs (CAUI-4 mode)
• Latency variation: ±5 ns
Electrical and Mechanical
• Supply voltage: 3.135 to 3.465 V
• ESD protection: 500 V (HBM, Class 1B)
• Pinout: QSFP28 standard (SFF-8679)
• Dimensions: 119.0 × 18.35 × 13.5 mm (L × W × H)
Typical Applications
• 100G coherent metro and regional transport networks
• Data center interconnect (DCI)
• EDFA-only long-reach links up to 120 km
• High-capacity DWDM infrastructure in the C-band