optical_io
by Andy Sun (achoenix@gmail.com)
Last update: 2025/10/04
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External Light Source for CPO
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Standards
CW-WDM
Version: June 4th, 2021
Wavelength grid specifications
Table 2–5 Grid specifications
| Description | Wavelength span (nm) | Number of channels | Channel spacing (GHz) | Channel bandwidth (GHz) |
|---|---|---|---|---|
| Grid definition | 9 | 8+1 | 200 | 100 |
| 9 | 16+1 | 100 | 50 | |
| 18 | 8+1 | 400 | 200 | |
| 18 | 16+1 | 200 | 100 | |
| 18 | 32+1 | 100 | 50 | |
| 36 | 8+1 | 800 | 400 | |
| 36 | 16+1 | 400 | 200 | |
| 36 | 32+1 | 200 | 100 |
Maximum output power classes
| Output power class | 9 nm span | 18 nm span | 36 nm span | Units |
|---|---|---|---|---|
| Type 1 | 20 | 20 | 14 | dBm |
| Type 2 | 14 | 14 | 8 | dBm |
| Type 3 | 26 | 26 | 20 | dBm |
OIF-ELSFP
Version: 02.0 (January 8, 2025)
ELSFP module example
ELSFP application in CPO systems
ELSFP differnet solutions
Optical power classes
| Optical Power Classes | Power/λ/Core (+/- 1.5dB) |
|---|---|
| Low Power - LP | 11 dBm |
| Medium Power - MP | 14 dBm |
| High Power - HP | 17 dBm |
| Very High Power - VHP | 20 dBm |
| Ultra High Power - UHP | 23 dBm |
| Super High Power - SHP | 26 dBm |
Selected Electrical power specifications
| Parameter | Symbol | Minimum | Nominal | Maximum | Unit |
|---|---|---|---|---|---|
| ELSFP power supply voltage | Vcc | 3.135 | 3.3 | 3.465 | V |
| Total VCC Supply Current* | Icc | 9 | A |
*: Utilization of the maximum ELSFP electrical power rating requires thermal design and validation at the system level to ensure the maximum connector temperature is not exceeded. An informative design practice is to heatsink the host board power pin pads with multiple vias to a thick copper power plane for conductive cooling.
IPEC-PELS
Optical power classes and power consumption
| Parameter | Min | Max | Unit | Power consumption |
|---|---|---|---|---|
| Optical power max per fiber @12ch | 17.5 | 19 | dBm | <9W |
| Optical power max per fiber 1:4 [DR4]@8ch | 19 | 21 | dBm | <15W |
| Optical power max per fiber 1:4 [FR4]@8ch | 20 | 22 | dBm | <15W |
| Optical power max per fiber 1:8 [DR4/FR4] | TBD | TBD | dBm | TBD |
| Optical power max per fiber 1:4 [DR4]@16ch | TBD | TBD | dBm | TBD |
| Optical power max per fiber 1:4 [FR4]@16ch | TBD | TBD | dBm | TBD |
OIF-Co-Packaging-3.2T
Suppliers
Summary
Comparison
| Company | Product | Features | Status(1) |
|---|---|---|---|
| Accelink 光迅 | ELSFP Module | >20dBm/CH | PR (2025) |
| AOI | ELSFP module | 8CH, CWDM, 19.5dBm/CH, Cooled, 12W@55°C | Demo (2022) |
| Broadcom | QSFP-DD module | 8CH, 1310nm, 20dBm/CH, 0-45°C | Product, Limited Release |
| Casela (镭芯) | ELSFP Module DFB laser |
8CH 20dBm, 1310nm, 200mW, 20% WPE@70°C |
Product |
| Coherent (II-VI) | ELSFP module DFB laser |
8x 1310nm Laser 400mW |
PR (2025) |
| Furukawa | ELS module | 16CH, 1310nm, 20dBm/CH, <13W, 25-55°C | Demo (2024) |
| HGTech (华工正源) | ELSFP Module | 1310nm 200GHz DWDM, QD comb laser | PR (2025) |
| Lumentum | ELSFP Module DFB laser |
UHP? (23dBm), 1310nm 500mW cooled, 200mW uncooled |
Demo (2023) |
| O-net (昂纳) | ELSFP Module | 4-8 CH, 1310nm, 20dBm/λ/fiber, 25dBm (PR) | Demo (2025) |
| Pilot | ELS Module | 16 wavelength comb laser, 14dBm/CH, 1310nm 200GHz DWDM | Product |
| Shijia (仕佳) | DFB laser | 1310nm, 125mW, 0-75℃ 500mW |
Product Sampling |
| Terahop (旭创) | ELSFP Module | 8CH, 24dBm/CH | Demo (2025) |
| YUANJIE (源杰) | DFB laser | 150mW | R&D PR (2025) |
- (1): As of 2025/09
Accelink
光迅科技
Product
- ELSFP Module
-
20dBm/CH
- for 3.2Tbps optical engine
-
AOI
Product
[ECOC Interop (2022)]
- ELSFP module
- 8CH, CWDM
- 19.5dBm/CH
- Power consumption: <12W @ 55°C
- TEC Cooled
[OFC Interop (2022)]
- ELSFP module
- 8CH, CWDM
- 18dBm/CH
- Power consumption: <12W @ 55°C, <15W @70°C
- TEC Cooled
Broadcom
Product
- QSFP-DD 800-mW CWDM Laser Module
- 8CH, 100mW/CH
- 0°C to 45°C case temperature
- Lifecycle Status: Limited Release
Casela
南京镭芯光电
Product
- ELSFP Module
- 8x 20dBm output
- ELS subassembly
- 150mW/CH in 4x PMF
- Uncooled 1310nm (and CWDM) CW DFB lasers
- 100-200mW
- 20% WPE @70C
Coherent (II-VI)
Product
- 400mW CW DFB Laser
- ELSFP Module
- 8 CW Laser, BH DFB
- wavelength accuracy and linewidth control
Furukawa Electric (Fitel)
Product
- ELS module
- 16CH, 20dBm/CH
- in-house DFB lasers
- Option 1: 1311nm x 8
- Option 2: 4-1 CWDM x 2
- 2x 8CH-TOSA, TOSA size: 22.5 mm(L) x 13.0 mm(W) x 3.3 mm(H)
- case temperature 25-55 °C
- Power consumption: <13W
HGTech
华工正源
Product
- ELSFP Module (Gen2)
- DWDM
- Based on Si photonics quantum dot comb laser
Lumentum
Product
- ELSFP Module
- ultra-high-power (UHP) 1310 nm lasers
- high power 1310nm DFB laser
- 500mW cooled, 200mW uncooled
- modified from 14xx Raman pump laser technology
- supports other CWDM wavelengths
O-Net
昂纳
Product
- ELSFP Module
- Class VHP (20dBm/λ/fiber) (once marketing a 25dBm version)
- 4 or 8 channels
- Cooled or Uncooled laser (1310nm)
- 2x DR4 or 2x FR4 configurations
- ELSFP Module
- 25dBm output
- 12.5% WPE (0-50C)
Partnership
Siver
- Press Release (2025/04)
- Siver: DFB laser provider
- O-Net: OEM module manufacturer
Lumentum
- Press Release (2023/04)
- Lumentum: ultra high power 1310nm DFB provider
- O-Net: (active) ELSFP module provider
Pilot Photonics
Product
- ELS Module
- 16 wavelength CW comb laser
- 14dBm/CH
- 200GHz DWDM
Shijia
仕佳光子
Product
- 1310nm DFB CW Laser
- 125mW
- 0-75℃
- 1310nm DFB CW Laser
- 500mW
- Sampling
Terahop (Innolight)
中际旭创
Product
- ELSFP Module
- 8CH, 24dBm/CH
YUANJIE
源杰科技
Product
- High power 1310nm DFB CW Laser
- 150mW (R&D)