Transceiver (Optical Module) is the core photoelectric conversion device of fiber-optic communication systems, known as the “photoelectric interpreter” of the network world and the “super express transfer station” for computing clusters.

To use a life analogy: If the Internet and AI computing clusters are compared to a global high-speed logistics network, servers and switches are large logistics warehouses, electrical signals are bulky cargo trucks with limited driving range, and optical fibers are unlimited-speed, high-capacity dedicated express lanes. Transceivers act as intelligent sorting transfer stations at warehouse gates — they convert massive cargo carried by electric signals into light signals traveling at the speed of light for transmission over optical fibers. When reaching the remote warehouse at the other end, they convert light signals back into electric signals to complete large-scale cross-regional data transmission.

Every short video scroll, cloud game session, AI image generation task, online office session, and mobile 5G web browsing relies on the millisecond-level photoelectric conversion performed by transceivers. After decades of industrial development, the transmission rate of transceivers has achieved leaps from 1Gbps to 1.6Tbps. The product form has evolved from discrete optical components to highly integrated precision encapsulated devices the size of a bank card. Faced with the urgent demand for computing interconnection brought by the explosion of large AI models, Huarui High Photonics adheres to the coordinated layout of dual technical routes: passive optical devices and high-speed active transceivers. Relying on independent photoelectric integration capabilities, the company steadily expands its footprint in telecom operator networks, government and enterprise private networks, supercomputing and intelligent computing centers, while simultaneously advancing domestic chip substitution and the commercialization of next-generation low-power optical interconnection technologies.

I. Core Composition and Operating Principles

A transceiver the size of a bank card encloses a sophisticated miniature “photoelectric factory”, consisting of seven core units: Transmitter Optical Subassembly (TOSA), Receiver Optical Subassembly (ROSA), electrical signal processing chips, precision passive optical components, main control MCU, high-frequency PCB circuits, and miniature heat dissipation temperature control structures. All functions revolve around bidirectional electro-optic and opto-electric conversion, with core components divided into two major systems: optical chips and electrical chips. The functional operation of transceivers depends on rapid data transmission via photoelectric chips.

Optical Chips: The core components integrated inside TOSA (transmitting optical subassembly) and ROSA (receiving optical subassembly), including lasers and photodetectors, responsible for electro-optic and opto-electric conversion. At present, low-end optical chips below 50Gb/s have achieved full domestic production, while high-end products of 100Gb/s and above still rely on imports.

Electrical Chips: The “brain” covering laser driver chips, DSP chips and other components, undertaking signal amplification, encoding and decoding tasks. Driver chips and TIAs for 4×25G products have realized domestic substitution. High-end DSP chips have long been monopolized by U.S. manufacturers including Broadcom and Marvell.

Passive Optical Supporting Devices: Components that regulate light beams without power supply, including micro lenses, optical isolators, wavelength division multiplexers, and fiber coupling assemblies. Equivalent to reflectors, condensers and flow dividers in optical paths, they focus light beams, prevent optical path interference from reflected stray light, and realize multiplexing/demultiplexing of multiple light beams to guarantee transmission efficiency of optical signals. Passive optical devices also constitute Huarui High Photonics’ core passive product line.

2. Operating Mechanism of High-Speed Transceivers

At the transmitting end, electrical signals are encoded and compensated by DSP chips, amplified by driver chips to drive optical chips and converted into optical signals. At the receiving end, optical signals are converted into weak electrical signals by photodetectors, amplified by TIAs, and restored to standard electrical signals by DSP chips. DSP chips eliminate transmission interference through algorithms, serving as the core guarantee for signal quality under high transmission rates.

Complete operating mechanism of high-speed transceivers (TX transmit link + RX receive link)

1. Transmitting End (Electric-to-Optical Conversion: Cargo Packing Process)

Massive electrical signals output by servers and switches resemble piles of express parcels, flowing through 5 simplified steps for easy understanding:

① Bulk electrical signals are sent to DSP, the “sorting and signal correction module”, which completes encoding and signal pre-emphasis compensation to offset signal loss generated during circuit board transmission;

② Processed signals are delivered to laser driver chips for waveform amplification, equivalent to uniform sorting and packaging of express goods;

③ Precise current output from driver chips drives lasers inside TOSA to emit light, engraving electrical signals into optical signals with varying brightness and wavelengths;

④ Micro lens assemblies converge light beams, while optical isolators block reflected stray light to avoid optical path interference;

⑤ Modulated optical signals are coupled into optical fibers, traveling nearly at the speed of light with ultra-low loss to remote equipment.

2. Receiving End (Optical-to-Electric Conversion: Cargo Unpacking Process)

Attenuated optical signals transmitted for several kilometers over optical fibers arrive at the receiving end, and the opto-electric restoration process is completed in reverse order:

① Faint optical signals enter ROSA, lenses converge light beams onto photodetectors and convert light into extremely weak electric currents;

② TIA amplifiers boost the weak current and filter clutter noise generated during fiber transmission;

③ Distortion-corrected signals are fed into DSP, which recovers complete data through clock recovery and chromatic dispersion compensation;

④ DSP outputs standard digital electrical signals to back-end servers and switches for data reading;

⑤ The MCU intelligent controller continuously inspects all equipment parameters and sends timely early warnings under abnormal conditions such as high temperature, loss of light or excessive signal attenuation.

The core value of transceivers lies in solving the pain point of rapid attenuation limiting the transmission distance of electrical signals. Optical signals feature ultra-low transmission loss, ultra-fast speed and far higher bandwidth than copper cables, while drastically cutting copper consumption. Thanks to transceivers, massive data required by AI big data centers can be rapidly exchanged between servers. Current mainstream transmission rates cover 10Gbps to 800Gbps, with wide applications in data centers, telecom networks, base stations, government private networks and other key scenarios.

3. Five Stages of Transceiver Industrial Evolution

1.Technology Foundation Period (1960–1994)

Breakthroughs in laser technology (1960) and fiber-optic communication theory (1966) laid the foundational framework. At this stage, components were discrete with no standardized form factors, transmission rates were below 1Gbps, products were only deployed on a small number of backbone networks, and heat dissipation relied on simple shell conduction.

2. Standardization Period (1995–2000)

The first mass-produced 1Gbps standardized transceiver launched in 1995, and the GBIC standard realized hot-plug capability, establishing transceivers as independent products. The 1X9 encapsulated module optimized compatibility in 1999, with single-module power consumption ranging from 1W to 2W, and contact thermal resistance emerging as an initial challenge.

3. Miniaturization & Speed Upgrade Period (2001–2010)

The popularization of the Internet drove the transformation toward “high speed + miniaturization”. The 10Gbps transceiver debuted in 2001, and the SFP+ package launched in 2009 delivered 10Gbps transmission at 1/3 the volume of GBIC modules. Single-module power consumption rose to 2–3W, heat accumulation became severe due to reduced size, and thermal conduction became the primary heat dissipation path.

4. High-Speed Development Period (2011–2020)

Cloud computing pushed transmission rates to 100Gbps, with QSFP packages becoming mainstream (QSFP28 for 100G, QSFP56 for 200G). Single-module power consumption reached 3.5–6W. The PAM4 modulation technology created more heat sources, and a mandatory requirement limited laser case temperature to ≤70℃.

5. Ultra-High-Speed Integration Period (2021–Present)

Demand from AI computing clusters has boosted transmission rates to 400G, 800G and 1.6T, shortening product iteration cycles to 2 years. Mass delivery of 800G transceivers commenced in 2025, and 1.6T products entered commercialization in 2026. QSFP-DD and OSFP packages dominate the market; 800G transceivers consume 15–30W of power, spurring the development of power-saving technologies including silicon photonics, LPO and CPO.

4. Industrial Trends and Development Outlook

The transceiver industry is currently undergoing technological transformation toward ultra-high speed and low power consumption. Silicon photonics, LPO, CPO and other emerging technologies are gradually being commercialized, and market demand for 800G transceivers is rising rapidly. Hirundo Optics Inc has launched pre-research on 800G transceivers and established deep cooperation with domestic photonic chip manufacturers, enabling domestic substitution solutions for 1G, 10G, 25G and 4×25G products.

Amid the global digitalization wave, transceivers, as core interface devices enabling bidirectional conversion between electrical and optical signals, are evolving from connection components for traditional communication networks into the “computing hub” supporting AI computing clusters. Leveraging full-scenario product layout, customized technical advantages and efficient delivery capacity, Hirundo optics Inc has built stable market presence in enterprise networks, telecom operators and data center sectors. Moving forward, alongside accelerated domestic substitution and technological breakthroughs in ultra-high-speed transceivers, the company will continue to deepen its layout in segmented markets, deliver premium optical communication solutions to global customers, and facilitate high-quality development of the digital economy.

Transceiver Product Lines Available from Hirundo optics Inc

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