CWDM Mux Demux are used to combine two or more wavelengths onto a single fiber, and/or separate two or more wavelengths out of a single fiber. It is widely used in MAN (metropolitan area network), LAN (local area network) and PON (passive optical network).

CWDMs are able to transport up to 18 CWDM wavelengths with a channel spacing of 20 nm in the spectrum grid from 1271 nm to 1611 nm. (For the ITU CWDM wavelength grid, please refer to ITU-T G.694.2)

Features
· Based on Free Space or TTF (Thin Film Filter) Technology 
· Multiplexing up to 18 Channels on Fiber Pair
· EXP Port for Expanding with Additional Wavelengths
· Monitor Port for Signal Analyzing or Troubleshooting
· Passive, Protocol Transparent for Ethernet, FC, OTN, SONET/SDH, etc.
· Fully Compatible with All ITU-T 1G/10G/25G CWDM Optics
· Applied to Metro, Regional and CWDM Networks

Since 2011, Wuhan Seifree Technology Co.,LTD has provided high quality fiber optic products and solutions for our customers in many industries, including broadband, telecom, data center, fiber laser, fiber sensor, on-line monitoring, medical equipment, aerospace and military defense.

Our Products
Fiber Optic Splitter (FBT Splitter, PLC Splitter, Filter Splitter)
WDM (Fused WDM, Filter WDM, CWDM, DWDM, OADM)
Micro-optic Devices (Optical Isolator, Optical Circulator)
Fiber Optic Interconnect (Fiber Optic patch Cable, Fiber Adapter, Fiber Attenuator)
Active Devices (SFP, SFP+, SFP28, QSFP+, QSFP28 optical module)

ODM
Seifree can design and produce various types of optical fiber devices and equipment that meet customer needs.
We have rich R&D experience and mature customization process, and can provide OEM/ODM services for communications, fiber lasers, fiber sensing, medical equipment, aerospace, military defense and other fields.

After-sales service
1-year Warranty: from the date of purchase, non-human faults within the warranty period can enjoy free maintenance services. If the warranty period is exceeded, we will charge maintenance fees according to the actual situation.
Exchange Goods: after receiving the goods, if the product has non-artificial quality problems, please contact the sales team to deal with the return and exchange issues.
Technical Support: we provide technical support for customers on-site measurement and use of products through email, telephone or video.

Quality Assurance
Based on the ISO9001 quality management system, Seifree ensures the reliability and consistency of products and services through effective management and control of each process.

Value-added services
Wuhan Seifree Technology Co., Ltd. is committed to developing a win-win relationship with customers.

In order to effectively promote a win-win development relationship, we provide customers with some value-added service options, aiming to help customers reduce costs, improve production efficiency, and optimize warehousing and logistics links.
· Stocking - timely delivery
· Customer zero inventory - reduce customer warehousing costs
· Personalized assembly - reduce labor costs

Q1: Is your company a manufacturer or dealer?
A1: We have our own factory in Wuhan, China.

Q2: Can you provide free samples for us?
A2: Sure, we can provide free samples for you, but the freight should be paid by you.

Q3: What's the lead time for all the goods that I required?
A3: It depend on the quantity of products. Generally, it would be 1 week.

Q4: What's the warranty for your products?
A4: Normally it is 1 year.

Q5: What's your payment term?
A5: It is 100% T/T in advance.

Q6: What's the MOQ for your products?
A6: 1pc is okay.