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40G QSFP+ ER4 40 km
Ascent QSFP+ ER4 is designed to operate over single-mode fiber system using 4 × 10 CWDM channels in 1310 band and links up to 40 km. The module converts 4 inputs channel of 10 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40 Gb/s optical transmission. On the receiver side, the module optically de-multiplexes a 40 Gb/s input into 4 CWDM channels signals, and converts them to 4 output channels of electrical data.
• Uncooled 4 × 10 Gb/s CWDM transmitter
• Supports 39.8 Gb/s to 44.6 Gb/s aggregate bit rates
• Up to 40 km transmission on SMF
• 18.5 dB link insertion loss budget
• Hot-pluggable QSFP+ form factor
• XLPPI electrical interface
• Duplex LC receptacles
• Built-in digital diagnostic functions, including optical power monitoring
• Compliant with QSFP+ MSA with LC connector
• RoHS-6 compliant
• Case operating temperature range: 0°C to +70°C
• Power dissipation < 3.5 W
General Product Characteristics
Item | Value | Notes |
Module Form Factor | QSFP+ | |
Number of Lanes | 4 Tx and 4 Rx | |
Maximum Aggregate Data Rate | 44.6 Gb/s | |
Maximum Data Rate per Lane | 11.2 Gb/s | |
Protocols Supported | Typical applications include OTN OTU3, 40G Ethernet, Infiniband, Fiber Channel, SATA/SAS3 | |
Electrical Interface and Pin‑out | 38‑pin edge connector | Pin‑out as defined by the QSFP+ MSA |
Maximum Power Consumption | 3.5 W | |
Management Interface | Serial, I2C‑based, 400 kHz maximum frequency | As defined by the QSFP+ MSA |
Data Rate Specifications
Item | Symbol | Min. | Typ. | Max. | Unit | Note |
Bit Rate per Lane | BR | 9.95 | 11.15 | Gb/sec | 1 | |
Bit Error Ratio | BER | 10‑12 | 2 | |||
Link distance on SMF‑28 | d | 0.002 | 40 | km | 3 |
Notes:
1. Compliant with 40GBASE‑ER4 and XLPPI per IEEE 802.3bm, OTU3 C4S1‑2D1 per ITU‑T Rec. G.695 and OTU3e1/OTU3e2 per ITU‑T G‑Series Rec. Supplement 43. Compatible with 1/10 Gigabit Ethernet and 1/2/4/8/10G Fibre Channel.
2. Tested with a PRBS 231‑1 test pattern.
3. Per 40GBASE‑ER4, IEEE 802.3bm. Links longer than 30km are considered to be engineered links, with losses less than the worst case specified for the fiber type.
Absolute Maximum Ratings
Item | Symbol | Min. | Typ. | Max. | Unit | Notes |
Maximum Supply Voltage | Vcc1, VccTx, VccRx | ‑0.5 | 3.6 | V | ||
Storage Temperature | Ts | ‑40 | 85 | °C | ||
Case Operating Temperature | Top | 0 | 70 | °C | ||
Relative Humidity | RH | 0 | 85 | % | 1 | |
Damage Threshold, per Lane | DT | 3.4 | dBm |
Electrical Characteristics (TOP = 0 to 70°C, VCC = 3.1 to 3.47 V)
Item | Symbol | Min. | Typ. | Max. | Unit | Notes |
Supply Voltage | Vcc1, VccTx, VccRx | 3.1 | 3.47 | V | ||
Supply Current | Icc | 1.13 | A | |||
Transmit Turn‑On Time | 2000 | ms | 2 | |||
Transmitter (per Lane) | ||||||
Single‑Ended Input Voltage Tolerance | VinT | ‑0.3 | 4.0 | V | ||
Differential Data Input Swing | Vin,pp | 120 | 1200 | mVpp | 3 | |
Differential Input Threshold | 50 | mV | ||||
AC Common Mode Input Voltage Tolerance (RMS) | 15 | mV | ||||
Differential Input Return Loss | Per IEEE P802.3ba, Section 86A.4.1.1 | dB | 4 | |||
J2 Jitter Tolerance | Jt2 | 0.17 | UI | |||
J9 Jitter Tolerance | Jt9 | 0.29 | UI | |||
Data Dependent Pulse Width Shrinkage | DDPWS | 0.07 | UI | |||
Eye Mask Coordinates {X1, X2, Y1, Y2} | 0.11, 0.31 95, 350 | UI mV | 5 | |||
Receiver (per Lane) | ||||||
Single‑Ended Output Voltage | ‑0.3 | 4.0 | V | |||
Differential Data Output Swing | Vout,pp | 0 | 800 | mVpp | 6, 7 | |
AC Common Mode Output Voltage (RMS) | 7.5 | mV | ||||
Termination Mismatch at 1 MHz | 5 | % | ||||
Differential Output Return Loss | Per IEEE P802.3ba, Section 86A.4.2.1 | dB | 4 | |||
Common Mode Output Return Loss | Per IEEE P802.3ba, Section 86A.4.2.2 | dB | 4 | |||
Output Transition Time, 20% To 80% | 28 | ps | ||||
J2 Jitter Output | Jo2 | 0.42 | UI | |||
J9 Jitter Output | Jo9 | 0.65 | UI | |||
Eye Mask Coordinates #1 {X1, X2, Y1, Y2} | 0.29, 0.5 150, 425 | UI mV | 5 | |||
Power Supply Ripple Tolerance | PSR | 50 | mVpp | |||
otes:
1. Maximum total power value is specified across the full temperature and voltage range.
2. From power‑on and end of any fault conditions.
3. After internal AC coupling. Self‑biasing 100 Ω differential input.
4. 10 MHz to 11.1 GHz range
5. Hit ratio = 5 x 10E‑5.
6. AC coupled with 100 Ω differential output impedance.
Optical Characteristics (TOP = 0 to 70°C, VCC = 3.1 to 3.47 V)
Item | Symbol | Min. | Typ. | Max. | Unit | Notes |
Transmitter (per Lane) | ||||||
Signaling Speed per Lane | 9.95 | 11.15 | GBd | 1 | ||
Lane Center Wavelengths (Range) | 1264.5‑1277.5 1284.5‑1297.5 1304.5‑1317.5 1324.5‑1337.5 | nm | ||||
Total Average Launch Power | Pout | 10.5 | dBm | |||
Average Launch Power per Lane | TXPx | ‑2.7 | 4.5 | dBm | 2 | |
Transmit OMA per Lane | TxOMA | 0.3 | 5.0 | dBm | ||
Difference in Power Between Any Two Lanes (OMA) | DPx | 4.7 | dB | |||
Transmitter Dispersion Penalty | TDP | 2.6 | dB | |||
Launch Power (OMA) Minus TDP per Lane | P‑TDP | ‑0.5 | dBm | |||
Optical Extinction Ratio | ER | 5.5 | ||||
Sidemode Suppression Ratio | SSRmin | 30 | dB | |||
Average Launch Power of OFF Transmitter, per Lane | ‑30 | dBm | ||||
Relative Intensity Tolerance | RIN | ‑128 | dB/Hz | 3 | ||
Optical Return Loss Tolerance | ORL | 20 | ||||
Transmitter Reflectance | ‑12 | dB | ||||
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3} | (0.25, 0.4, 0.45, 0.25, 0.28, 0.4) | |||||
Jitter Generation | Per OTL3.4 section 4.14.1 | |||||
Receiver (per Lane) | ||||||
Signaling Speed per Lane | 9.95 | 11.15 | GBd | 4 | ||
Lane Center Wavelengths (Range) | 1264.5‑1277.5 1284.5‑1297.5 1304.5‑1317.5 1324.5‑1337.5 | nm | ||||
Receive Power (OMA) per Lane | RxOMA | ‑4.0 | dBm | |||
Average Receive Power per Lane | RXPx | ‑21.2 | ‑4.5 | dBm | 5 | |
Receiver Sensitivity (OMA) per Lane | Rxsens | ‑19 | dBm | |||
Stressed Receiver | SRS | ‑16.8 | dBm | |||
Damage Threshold per Lane | PMAX | 3.8 | dBm | |||
Return Loss | RL | ‑26 | dB | |||
Jitter Tolerance | Per OTL3.4, G.8251 | |||||
Vertical Eye Closure Penalty, per Lane | 2.2 | |||||
Receive Electrical 3 Db Upper Cutoff Frequency, per Lane | 12.3 | GHz | ||||
LOS De‑Assert | LOSD | TBD | dBm | |||
LOS Assert | LOSA | TBD | dBm | |||
LOS Hysteresis | 1 | dB | ||||
Notes:
1. Transmitter consists of 4 lasers operating at up to 11.2 Gb/s each, ± 20 ppm
2. Minimum value is informative.
3. RIN is scaled by 10 * log(10/4) to maintain SNR outside of transmitter.
4. Receiver consists of 4 photodetectors operating at up to 11.15 Gb/s each, ±100 ppm
5. Minimum value is informative, equals min TxOMA with infinite ER and max channel insertion loss.
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