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Customer FAQ

DATE:2022-10-13   VISITS:75

The customer does not confirm the specification when placing an order:

Some people say that they should meet the differentiated needs of users. Many business divisions have different requirements for broadband or network. Operators need to operate and charge differently. Some people say that there should be enough content driven. Without enough content to constitute killer applications, why do users install such fast broadband? About Fiber Optic Home Access to the "Optical Network" Operation Mode - Analysis of the Ten Key Issues of Fiber Optic Home Access After the basic realization of comprehensive coverage, what else should be done for fiber optic home access? Some people say that the actual loading rate should be increased. 

The benefits of confirming product specification requirements:

    1. Understand customer product requirements and produce products that meet customer requirements;

    2. More reasonable quotation and evaluation of production delivery time to reduce losses caused by unconfirmed specifications;

    3. Save a series of communication costs and time for subsequent order production. 

Our production order list is a very comprehensive order specification and must be fully confirmed with the customer in accordance with this form.

Customers are demanding but demanding low prices:

Among the products of the same type and model, the main factors that determine the price are as follows (only in terms of product requirements, excluding business aspects): 

    a. Optical parameters, namely insertion loss, return loss, polarization, directivity, uniformity, temperature-dependent loss, and wavelength-dependent loss (the latter two customers have fewer requirements);

    b. Box shape and product packaging;

    c. The experimental requirements mainly refer to the boiling experiment;

To sum up,

     1. Optical parameters will mainly affect the yield. For example, in a certain month in 2012, 1*8 does not add the insertion loss value. The yield of 10.4dB is 92%, and the yield of 10.2dB is 51%. Only 0.2dB is a difference of 41%. % yield.

     2. The shape of the box is mainly reflected in whether it is a special box shape. If it is not neutral, the quantity is small, there is no ready-made outside, and the material cost is high; the packaging method mainly reflects whether the inner packaging is individually packaged or the material and size of the specified packaging box. 

     3. Experiment requirements: The boiling experiment is made by a special process and is not suitable for normal

Customers only care about price, not product quality:

Products must meet international and national standards, and any experiments to verify reliability must not be discounted or omitted. Achieving reliable quality comes at a cost. An example is as follows:

1.Regardless of whether it is to meet the requirements of design or production, the products must meet the requirements of relevant standards. It is not necessary to make them, but to make them of good quality.

2.The high-temperature storage and high and low temperature cycle experiments in production are much shorter than the reliability experiments (the time in production is 3 hours, 10 cycles are 48 hours, and the time in the reliability experiment is 2000 hours, 500 cycles 2000 Hours);

3.The high-temperature storage and high-low temperature cycle experiments and reliability experiments in production have different purposes:

          a)The high temperature storage experiment in the production process is for the curing of the glue and the stress release of the product;

          b)The high and low temperature cycle experiment is for product screening, and the products with potential hidden dangers will be screened out, so that the products will fail and can be found before shipment;

          c)The reliability test is to verify whether the life and performance of the product meet the expected requirements

Adding or not adding an adapter is the same insertion loss value:

Some customers have the same insertion loss value for miniature, box type and insert type, tray type and rack type. The customer explained that there are two adapters in the test, so the insertion loss value is the same.

Answer: The parameter requirements of the adapter used for testing are different from those of ordinary adapters. The national standard YD/T 1272.1/3/4 also stipulates that the standard adapter is used for testing, and its parameter requirements are significantly higher than those of ordinary adapters (0.1dB for standard adapters and 0.2dB for ordinary adapters), and there will be an adapter before product testing. For the action of returning to zero, one standard adapter is used for miniature and box-type zeroing, and two standard adapters are used for insertion loss test. 

In theory, the final insertion loss value will include the value of another standard adapter, which will increase 0.1dB, while 2 common adapters are used when testing insert type, tray type, and rack products, except for 1 standard adapter 0.1dB when returning to zero, the final insertion loss value of the product will theoretically increase by 0.3dB (2 common adapter, minus 1 standard adapter for zeroing), therefore, the insertion loss value of the product with the adapter will be 0.2dB more.

What is the difference between the pull-cone optical splitter and the PLC optical splitter:

The production process is different:

FBT optical splitter: By approaching, melting and stretching two or more bare optical fibers, the outer layers of each optical fiber are sintered together to produce a coupling area, thereby realizing a separation device for optical power. 


Planar waveguide optical splitter, the function of light splitting is completed at one time by chip integration, and the two ends of the chip are connected by optical fiber arrays that couple the input and output.


The difference in splicing performance between pure FBT and pure PLC and FBT+PLC:

    1.There is no difference in performance between pure FBT and FBT+PLC;

    2.Pure PLC has better splicing performance than pure FBT and FBT+PLC, and has the advantages mentioned on the previous page;

    3.The splitting ratio of pure FBT is variable, and the splitting ratio of pure PLC and FBT+PLC is not good;

    4.FBT+PLC mix has a certain channel limit;

    5.Pure PLC splicing has a very strict channel number limit, and the output must be 2 to the nth power (n=1...7);

What is the structure of pure FBT and FBT+PLC mixed together?

The pure FBT spelling structure is shown in the following figure (example 1*9):


Whether the optical splitter can be used in reverse:

    1.FBT optical splitter can be made into a combiner, which can be used in reverse;

    2.The PLC optical splitter can also be used in reverse, for example, the downlink is 1490nm, and the uplink is 1310nm, but the insertion loss value of the same wavelength will be slightly larger when the actual measurement is reversed;

    3.The grating type device, in order to meet the suppression requirements of echo reflection, has requirements on the incident angle, so it is basically irreversible.

The PDL of silicon-based PLC devices is generally relatively large:

    1.Silicon refers to the material of the V-groove - in FA, the transmission of light lies in the optical fiber, not from the V-groove, regardless of the material of the V-groove, so the PDL will not be larger than that of the quartz V-groove, and if the lithography plate is made Well, the accuracy is more accurate than the quartz V-groove, so it will be much better than the quartz V-groove;

    2.Silicon-based refers to the material of the chip - theoretically, the light in the chip is transmitted in the waveguide, not the substrate silicon base of the chip, and the waveguide of the silicon-based chip is not silicon-based, so there is no phenomenon that the PDL will be larger. On the contrary, the advantages of large capacity, high transmission speed, and strong integration of silicon-based make the application of silicon-based more extensive.

Product internal structure explanation:

PLC input Pigtail

The PLC input end is generally Pigtail, which is composed of a 250um diameter optical fiber, a D-type capillary glass tube and a caudal vertebrae.

This picture shows the Pigtail at an inverse 8 degree angle.


PLC output FA

The output end of PLC is Fiber Array (FA: Fiber Array), which consists of V-groove, glass cover, ribbon fiber and packaging glue.

This picture shows the FA at a positive 8 degree angle.


PLC core

The PLC core consists of PLC chip, Pigtail and FA

Bare fiber PLC

Bare fiber PLC consists of PLC core, steel pipe and rubber plug


Micro PLC 

Micro PLC consists of PLC core, steel pipe, porous rubber plug and 900um casing.

According to customer requirements, with or without connector head.


Box PLC 

Box PLC consists of bare fiber PLC, 2.0/3.0mm casing and ABS module box.

According to customer requirements, with or without connector head can be added.


The plug-in PLC 

The plug-in PLC consists of a micro PLC (with connectors), an adapter and a plug-in module box.



When quoting, the price of the micro PLC, adapter, and insert box should be added up, so that the price of the finished product is the price. For example, the price of 1*8 insert type includes: one micro 1x8PLC, nine adapters and one insert box.

Tray PLC 

Tray PLC consists of micro PLC (with connector), adapter and tray module box.



When quoting, the price of the micro PLC, adapter and tray box should be added up, so that the price of the finished product is the price.

For example, the price of 1*8 insert type includes: one micro 1x8PLC, nine adapters and one pallet box.

The rack-type PLC

The rack-type PLC consists of a box-type PLC (with connectors), an adapter and a rack box. 



When quoting, you need to add up the prices of the box PLC, adapter, and rack box, so that is the price of the finished product.

For example, the price of 1*8 rack type includes: one box 1x8PLC, nine adapters and one rack box.

PLC splicing process

PLC splicing can only be used for box PLC due to the space of the box.

Splices require heat shrink tubing to protect the splices.

Taking the splicing 2 points and 32 boxes as an example, the required raw materials are: 1 2x2 PLC, 2 1x16 PLCs, 2 heat shrinkable sleeves, one module box, 2.0/3.0mm sleeve, the connector head depends on customer requirements.



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