fJscaler

What fJscaler does

fJscaler Inc. is a privately held, fabless semiconductor company founded in 2022 and headquartered in Beaverton, Oregon, with a wholly owned European subsidiary, fJscaler Germany GmbH, in Berlin. The company designs and sells high-speed linear semiconductor devices for the optical communications market, targeting optical transceiver manufacturers and AI infrastructure providers. Its product portfolio centers on two production devices: the FJS1000 quad-channel 64GBd linear Mach-Zehnder modulator driver (1.95W typical power dissipation) and the FJS1001 dual-channel 64GBd differential linear transimpedance amplifier (TIA) (495mW typical power dissipation), both designed to enable QSFP-DD and OSFP form factor silicon photonics optical transceivers at 100G, 200G, 400G, and emerging 800G data rates. In March 2025, the company publicly demonstrated a 260 GBd BiCMOS Linear Driver prototype aimed at 1.6T coherent optics, 1.6T and 3.2T IMDD optics, and active copper links for next-generation AI infrastructure.

The company's technology is built on three pillars: DSP-based optical coherent processing, DSP-free optical direct detect with digitally assisted calibration, and analog coherent processing of QPSK and 16QAM signals using continuous analog signal processing that preserves the inherent low latency of fiber optics interconnects. These technologies support both silicon photonics (SiPh) and Indium Phosphide (InP) Mach-Zehnder modulators. fJscaler positions itself around femto-Joule-class energy efficiency per bit and over two decades of accumulated mixed-signal design expertise.

The company operates a B2B, direct-OEM sales model, engaging optical transceiver manufacturers for component qualification and volume procurement. Pricing is not publicly disclosed and is described as quote-based and negotiated per customer and volume. Revenue is generated through hardware sales of semiconductor components, with fJscaler Inc. handling US operations and fJscaler Germany GmbH serving EMEA customers. As of March 2026, the company had raised $7.5M in disclosed funding and employed 11-50 people.

Name

fJscaler

Legal name

fJscaler Inc.

Website

https://fjscaler.com

Company type

Private

Founded year

2022

Operating status

Operating

Headcount range

51–100 employees

Short description

fJscaler is a Beaverton, Oregon-based fabless semiconductor company that designs and sells high-speed linear TIAs and Mach-Zehnder modulator drivers for optical transceiver manufacturers and AI infrastructure providers, serving 100G to 1.6T/3.2T coherent and direct-detect applications through direct B2B sales in the US and EMEA.

Ownership category

akta.pro rank

Product category

Optical Communications Semiconductors

NAICS

Semiconductor and Related Device Manufacturing (334413), Semiconductor and Other Electronic Component Manufacturing (3344)

SIC

Semiconductors & Related Devices (3674)

akta.pro primary industry

Microwave & RF Signal Chain ICs (Mixers/Detectors/Attenuators) (HDAHAMAL)

akta.pro secondary industries

Optoelectronic Receivers & Transceivers (Photodetectors/Optical Modules) (HDAHALAM), Amplifiers & Comparators (HDAHAIAC)

Keywords

• Optical communications semiconductors
• Linear transimpedance amplifiers
• Mach-Zehnder modulator drivers
• Silicon photonics components
• High-speed coherent optics

Headquarters

HQ city

Beaverton

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Personnel, Operations, Marketing or Sales

Revenue model

1. High-Speed Linear Semiconductor Devices: fJscaler generates revenue through the sale of high-speed linear semiconductor devices including transimpedance amplifiers (TIAs) and linear Mach-Zehnder modulator drivers. Products are sold as components for integration into optical transceivers targeting data center and AI infrastructure applications. The company delivers devices in production for 100G/200G and 400G coherent optics with emerging 1.6T capabilities.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

fJscaler designs and manufactures high-speed linear semiconductor devices — including transimpedance amplifiers (TIAs) and linear Mach-Zehnder modulator drivers — that are integrated into silicon photonics (SiPh) and Indium Phosphide (InP) optical transceivers. The products support DSP-based coherent, DSP-free direct detect, and analog coherent optical signal processing across 100G to 800G data rates, and are sold as components to optical transceiver OEMs and AI infrastructure providers. The company also has a demonstrated 260 GBd BiCMOS linear driver prototype targeting 1.6T/3.2T applications.

Product overview

fJscaler delivers high-speed linear semiconductor devices for the optical communications market. The product portfolio consists of two core products: the FJS1000 quad-channel linear Mach-Zehnder modulator driver and the FJS1001 dual-channel linear transimpedance amplifier (TIA). Both products support 64GBd operation and are designed for QSFP-DD and OSFP form factor silicon photonics optical transceivers, serving 100G/200G, 400G, and next-generation coherent optics applications up to 800G.

Differentiator

Problem solved

Functional benefit

Products and services

• FJS1000 Quad-channel 64GBd linear Mach-Zehnder modulator driver with 4VP-P output and 1.95W typical power dissipation, designed for QSFP-DD and OSFP form factor silicon photonics optical transceivers used in coherent optics applications.
• FJS1001 Dual-channel 64GBd differential linear transimpedance amplifier (TIA) with variable gain amplifier (VGA) and output buffer; each channel independently controllable via analog pins. Low 495mW power dissipation enables QSFP-DD and OSFP form factor optical transceivers.

Quantifiable outcome

• 1.95W typical power dissipation for quad-channel 64GBd modulator driver (FJS1000)
• +3 more outcomes

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators3 records

Recent moves4 records

Expansion highlights4 records

Direct peers

• Semtech Corporation: Semtech's Signal Integrity and Optical product groups (including former Gennum and Sierra Wireless assets) supply TIAs, CDR/retimer ICs, and linear components for optical transceivers and active copper cables. It is a direct competitor in the same analog front-end ICs for data center and AI interconnect applications.
• MACOM Technology Solutions: MACOM is a leading merchant supplier of high-performance analog RF, photonic, and semiconductor ICs for optical networks, including TIAs, drivers, and coherent components for 100G–800G+ transceivers. It directly competes with fJscaler's linear driver and TIA portfolio in the same silicon-photonics-based optical transceiver market.
• Credo Technology Group: Credo designs high-speed connectivity semiconductors including retimers, TIAs, and DSPs for optical and active copper cable applications in hyperscale data centers. It competes directly with fJscaler's analog front-end ICs for next-generation AI and cloud interconnect, especially in 800G/1.6T.
• Marvell Technology (Inphi): Marvell, through its Inphi acquisition, is the dominant supplier of DSP-based coherent optical DSPs and high-speed analog ICs for hyperscale data center interconnects. It overlaps directly with fJscaler's coherent and linear analog signal-chain product positioning across 100G–800G and emerging 1.6T designs.

Broad incumbents

• Coherent Corp (formerly II-VI): Coherent Corp is a broad optical components and materials platform serving datacom, telecom, and AI interconnect markets with lasers, modulators, and transceiver subassemblies. It is comparable to fJscaler as a supplier into the same silicon photonics and InP transceiver customer base for 100G–1.6T designs.
• Renesas Electronics (formerly IDT): Renesas, with its IDT/Intersil heritage, supplies mixed-signal and timing ICs for communications infrastructure including components used in optical transceivers. It is a broader incumbent competing in adjacent parts of the analog signal chain that fJscaler serves for high-speed optical interconnects.
• Analog Devices: Analog Devices is a global analog and mixed-signal IC leader with a portfolio that includes high-speed amplifiers and signal-chain components used in optical communication transceivers. While broader than fJscaler's narrow optical focus, ADI competes in the same high-frequency linear analog IC space for coherent and direct-detect optics.
• Broadcom: Broadcom is a broad-line incumbent in optical semiconductors, supplying DSPs, TIAs, drivers, and photonic components across Ethernet, coherent, and pluggable transceiver markets. Its scale and foundry relationships make it a primary competitor for AI infrastructure optical design wins that fJscaler targets.
• Lumentum Holdings: Lumentum is a major merchant supplier of photonic components and modules, including lasers and integrated optical subassemblies used in coherent and direct-detect transceivers. As a system-level incumbent in the optical communications value chain, it both competes with and provides complementary technology alongside fJscaler's driver/TIA ICs.

Emerging players

• MaxLinear: MaxLinear, through its acquisitions of Intel's Home Gateway Platform and previous optical assets, supplies connectivity SoCs and analog ICs for optical and copper interconnect. It overlaps with fJscaler in parts of the high-speed analog signal chain for data center and AI networking applications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/fjscaler

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about fJscaler