optical_io

by Andy Sun (achoenix@gmail.com)

Last update: 2025/10/04

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License & Citation

CPO Light Source

Navigation

• Standards
  • CW-WDM
  • OIF-ELSFP
  • IPEC-PELS
  • OIF-Co-Packaging-3.2T
• Suppliers
  • Accelink
  • AOI
  • Broadcom
  • Casela
  • Coherent (II-VI)
  • Furukawa (Fitel)
  • HGTech
  • Lumentum
  • O-net
  • Shijia
  • Terahop (Innolight)
  • YuanJie

Standards

CW-WDM

Website

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

Website

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

Press Release (2025/09)

• 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

Product Page

• 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

Product Page

• 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

Press Release (2025/09)

• 400mW CW DFB Laser
• ELSFP Module
  • 8 CW Laser, BH DFB
  • wavelength accuracy and linewidth control

Furukawa Electric (Fitel)

Product

Press Release (2024 OFC)

• 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

Press Release (2025/09)

• ELSFP Module (Gen2)
  • DWDM
  • Based on Si photonics quantum dot comb laser

Lumentum

Product

Press Release (2025/09)

• ELSFP Module
  • ultra-high-power (UHP) 1310 nm lasers

OFC Interop (2023/03)

• 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

Product Page

• 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

**Press Release (2025/09)

• 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

Product Page

• ELS Module
  • 16 wavelength CW comb laser
  • 14dBm/CH
  • 200GHz DWDM

Shijia

仕佳光子

Product

Product Page

• 1310nm DFB CW Laser
  • 125mW
  • 0-75℃

Press Release

• 1310nm DFB CW Laser
  • 500mW
  • Sampling

Terahop (Innolight)

中际旭创

Product

ECOC Interop (2025/09)

• ELSFP Module
  • 8CH, 24dBm/CH

YUANJIE

源杰科技

Product

**Market Research

• High power 1310nm DFB CW Laser
  • 150mW (R&D)

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