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    Optical Coupler

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    Hai Tạ Ló
    The document discusses optical couplers, including their types, parameters, construction, and applications. It describes how couplers are used to split, combine, and divert signals in fiber optic systems. Specifically, it explains that couplers come in different types like tree and star couplers and discusses their functions. Parameters like excess loss, insertion loss, and coupling ratio are also covered. Construction methods for fused, mixing rod, and variable couplers are summarized. Finally, the document notes that couplers play an important role in optical systems as building blocks for components like modulators and switches.

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    Optical Coupler

    Uploaded by

    Hai Tạ Ló
    478 views28 pages
    The document discusses optical couplers, including their types, parameters, construction, and applications. It describes how couplers are used to split, combine, and divert signals in fiber optic systems. Specifically, it explains that couplers come in different types like tree and star couplers and discusses their functions. Parameters like excess loss, insertion loss, and coupling ratio are also covered. Construction methods for fused, mixing rod, and variable couplers are summarized. Finally, the document notes that couplers play an important role in optical systems as building blocks for components like modulators and switches.

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    The document discusses optical couplers, including their types, parameters, construction, and applications. It describes how couplers are used to split, combine, and divert signals in fiber optic systems. Specifically, it explains that couplers come in different types like tree and star couplers and discusses their functions. Parameters like excess loss, insertion loss, and coupling ratio are also covered. Construction methods for fused, mixing rod, and variable couplers are summarized. Finally, the document notes that couplers play an important role in optical systems as building blocks for components like modulators and switches.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    478 views28 pages

    Optical Coupler

    Uploaded by

    Hai Tạ Ló
    The document discusses optical couplers, including their types, parameters, construction, and applications. It describes how couplers are used to split, combine, and divert signals in fiber optic systems. Specifically, it explains that couplers come in different types like tree and star couplers and discusses their functions. Parameters like excess loss, insertion loss, and coupling ratio are also covered. Construction methods for fused, mixing rod, and variable couplers are summarized. Finally, the document notes that couplers play an important role in optical systems as building blocks for components like modulators and switches.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 28

    The instructor: H c Tm Linh

    Hong Chung Phm Gia Lng Mai Th Qu L Trn Th Kiu Oanh

    I. THEORY 1. Concept 2. Principle of Operation 3. Parameter 4. Types and fuction 5. Construction 6. Application 7. Fused Biconical Taper FBT II. SIMULATION

    1. OPTICAL COUPLER Couplers are one of the most common devices in fibre systems, use to split, combine and diverged signals within systems. is coupling ration, with = , coupler divided signal input into two equal parts at the output. Coupler in this case is called coupler 3 dB.

    1. OPTICAL COUPLER Passtive couplers is device allocate signals without change optical signal to electric signal. Active couplers is electric device, can split or join electric signal. Directional Coupler carry light only direction. Bidirectional Couplers carry light in either direction.

    Light couples from one wavelength to the other

    The propagation mode of the combined waveguide Electric fields outputs (Eo1 , Eo2), inputs (Ei1 , Ei2):

    When used only one active input:

    For a 3dB coupler the coupling length

    must be chosen to satisfy:

    3. PARAMETER
    Excess Loss.

    Insertion Loss.

    Coupling Ratio.

    3. PARAMETER
    Uniformity.

    Polariation-dependent Loss. Loss < 0.15dB.


    Directivity. Near end Crosstalk

    3. PARAMETER
    Return Loss

    Isolator.

    4. OPTICAL COUPLER TYPES AND FUCTION Three port fibre Splitter: Y Coupler simply divides the signal into two outputs.

    T Coupler fuctions the same as Y coupler, connect multiple terminals on a network.

    4. OPTICAL COUPLER TYPES AND FUCTION

    Three port fibre Combiner: use to combiner signals from two input to single output.

    4. OPTICAL COUPLER TYPES AND FUCTION


    Tree Coupler: - One or two inputs and split it into multiple outputs and backward. - Tree couplers have been extensively used to split and mix optical signal in CATV, LANs and all other kinds of optical comunication systems.

    4. OPTICAL COUPLER TYPES AND FUCTION

    Four port fibre Coupler or X Coupler, use to split and join signal, also know is Diverged Coupler.

    4. OPTICAL COUPLER TYPES AND FUCTION Star Fibre Coupler: mixing optical signals from all inputs and then distribute them among all outputs.

    4. OPTICAL COUPLER TYPES AND FUCTION Comphare T Coupler and Star Coupler:

    5. CONSTRUCTION OF COUPLER Fused coupler: The fibers are brought together and are then fused just like in a fusion splicer as seen in figure:

    5. CONSTRUCTION OF COUPLER
    A fused star coupler is made in a similar way

    5. CONSTRUCTION OF COUPLER
    Mixing rod coupler: In mixing rod, the incoming light spreads out until it occupies the whole diameter of the fiber. And come out each receive some of the light.

    5. CONSTRUCTION OF COUPLER
    Variable Coupler: A vernier adjustment allows precise positioning of the incoming fiber so that the light can be split accurately between the two output fibers to provide any required splitting ratio.

    Perform split/join optical signals .

    A star coupler nxn made by combining 3 dB coupler.

    Tap off a small portion of the light stream for monitoring purposes : close to 1(0.90 0.95) Building blocks: Modulator Switches Filters Multiplexers/ demultiplexers

    Ampifiers RAMAN use to coupler

    Amplifiers EDFA use to Coupler

    Internal struction of a 4 Channel WDM MUX and DEMUX

    FBT method is the most common way of

    manufacturing coupler. An optical fiber coupler is a device that distributes light from a main fiber into two or more fibers.

    Methods of fabricating: Fibre twisted, then spot fused under tension to form an elongated biconical taper structure.

    Features of FBT: low insertion loss low polarization dependent loss high return loss environmentally stable

    Applications monitoring testing high speed systems

    Couplers are one of the most common devices in fibre systems, use to split, combine and diverged signals within systems. There are two types Tree and Star Coupler. Coupler has an important role in optical system.

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