PM Fiber Devices: The Technological Cornerstone for Enabling the Next Generation of Optical Communic

Funny Stories

1. Daily life of ordinary optical fiber: late stage of social bullshit

Ordinary single-mode optical fiber is like a "social expert".

The optical signal can be twisted in any way it wants: horizontal polarization?

Vertical polarization? Twisted diagonally into a knot? It doesn't matter, it can be transmitted!

Result:

When the signal reaches the end point, the polarization state is "too drunk to recognize the father",

causing the signals to fight each other during high-speed communication (PMD effect).

Engineer: "Can your polarization be more stable?!"

Ordinary optical fiber: "Freedom! That's my attitude!"

2. The birth of polarization-maintaining optical fiber: "Obsessive-compulsive disorder patients" in the optical fiber industry

In order to cure this "random twisting" problem, scientists have added two "physical plug-ins" to optical fibers:

Trick 1:

Panda-type polarization maintenance - symmetrical majesty

Insert two "panda eye" stress rods (actually borate glass) on both sides of the fiber core.

Principle: These two "dark circles" pull the optical fiber desperately, causing asymmetric stress inside the fiber core.

Effect: As soon as the optical signal comes in, it is "fixed": "Only vertical shaking is allowed, not horizontal shaking!"

Optical signal: "I want to go diagonally..."

Panda polarization maintenance: "No, you don't want to." (cold)

Skill 2: Bow tie polarization maintenance - violent aesthetics

Directly make the fiber core into a "bow tie shape" to physically block the road to other polarization directions.

Principle: It's like putting light into a tunnel with only one lane. If you dare to turn, you will hit the wall!

Engineer: "Can this polarization still be changed?"

Bow tie polarization maintenance: "Try it and you will die." (smile)

Our solution: Full-scenario polarization-maintaining product matrix

In response to the cutting-edge needs of optical communications,

we have launched a family of high-reliability polarization-maintaining devices, 

covering the core technologies of the entire chain of design, manufacturing, and testing:

1. Polarization-maintaining fiber patch cord (PM Patch Cord)

Features: Panda-type/bow-tie-type optical fibers are optional, extinction ratio>25dB, and the operating wavelength covers 780nm~2μm.

2. Polarization-maintaining fiber splitter (PM Coupler)

Breakthrough: 1×2/2×2 splitting based on fused cone technology, polarization-dependent loss (PDL) <0.1dB, and supports harsh environments of -40℃~85℃.

3. Polarization-maintaining isolator (PM Isolator)

Advantages: Reverse isolation>40dB, suitable for narrow linewidth lasers (such as EML), and helps CPO (co-packaged optics) packaging miniaturization.

4. PM MEMS Optical Switch

Our PM MEMS optical switch can support 1xN channels (2≤N≤32); wavelength: 1310±30 or 1550±30; extinction ratio (PER) dB≥18;

switch response time ≤20ms; drive voltage: 5-12V.

5. PM WDM

PM CWDM and PM DWDM (the available channels are 1/4/8/12/16/18)

Technology Highlights: Why Choose Us?

• Military-grade precision: fully automatic axial fusion technology, polarization axis alignment error <1°.

• Full-link test: strict quality inspection by OTDR and polarization analyzer (such as EXFO PSO-200).

• Customized service: supports customer-specified fiber types (such as PM1550, PM1300) and connectors (LC/APC, MPO).

Hirundo attended the ANGACOM exhibition in Germany with its PM devices

Hirundo will attend the ANGACOM exhibition in Germany with polarization-maintaining devices from June 3 to 5, 2025.

Welcome all guests to visit Huarui Gao's booth and visit Huarui Gao's multi-core fiber fan-in fan-out solutions, mini wavelength division multiplexing products and lasers.