MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communication knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port. |
| A. | 13 dB |
| B. | 15 dB |
| C. | 14.77 dB |
| D. | 16.02 dB |
| Answer» D. 16.02 dB | |
| 2. |
A four-port FBT coupler has 60μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio? |
| A. | 42% |
| B. | 46% |
| C. | 52% |
| D. | 45% |
| Answer» E. | |
| 3. |
A four-port multimode fiber FBT coupler has 50 μW optical power launched into port 1. The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss. |
| A. | 0.22 dB |
| B. | 0.33 dB |
| C. | 0.45 dB |
| D. | 0.12 dB |
| Answer» B. 0.33 dB | |
| 4. |
The optical power coupled from one fiber to another is limited by ____________ |
| A. | Numerical apertures of fibers |
| B. | Varying refractive index of fibers |
| C. | Angular power distribution at source |
| D. | Number of modes propagating in each fiber |
| Answer» E. | |
| 5. |
COUPLERS_INSERTION_LOSS_IS_SAME_AS_THAT_OF_EXCESS_LOSS._STATE_WHETHER_THE_GIVEN_STATEMENT_IS_TRUE_OR_FALSE.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A four-port FBT coupler has 60μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio?$# |
| A. | 42% |
| B. | 46% |
| C. | 52% |
| D. | 45% |
| Answer» E. | |
| 7. |
A_four-port_multimode_fiber_FBT_coupler_has_50_μWoptical_power_launched_into_port_1._The_measured_output_power_at_ports_2,3_and_4_are_0.003,_23.0_and_24.5_μW_respectively._Determine_the_excess_loss.$# |
| A. | 0.22 dB |
| B. | 0.33 dB |
| C. | 0.45 dB |
| D. | 0.12 dB |
| Answer» B. 0.33 dB | |
| 8. |
A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss. |
| A. | 1.9 dB |
| B. | 1.4 dB |
| C. | 0.9 dB |
| D. | 1.1 dB |
| Answer» E. | |
| 9. |
A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output. |
| A. | Star |
| B. | Ladder |
| C. | WDM |
| D. | Three-port |
| Answer» B. Ladder | |
| 10. |
Calculate the splitting loss if a 30√ó30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.$ |
| A. | 13 dB |
| B. | 15 dB |
| C. | 14.77 dB |
| D. | 16.02 dB |
| Answer» D. 16.02 dB | |
| 11. |
How_many_manufacturing_methods_are_used_for_producing_multimode_fiber_star_couplers? |
| A. | Two |
| B. | One |
| C. | Three |
| D. | Five |
| Answer» B. One | |
| 12. |
The most common method for manufacturing couplers is ___________? |
| A. | Wavelength division multiplexing |
| B. | Lateral offset method |
| C. | Semitransparent mirror method |
| D. | Fused bi-conical taper (FBT) technique |
| Answer» E. | |
| 13. |
How many fabrication techniques are used for 3 port fiber couplers? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 14. |
________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber. |
| A. | 3-port |
| B. | 2*2-star |
| C. | WDM |
| D. | Directional |
| Answer» D. Directional | |
| 15. |
The optical power coupled from one fiber to another is limited by |
| A. | Numerical apertures of fibers |
| B. | Varying refractive index of fibers |
| C. | Angular power distribution at source |
| D. | Number of modes propagating in each fiber |
| Answer» E. | |
| 16. |
How many types of multiport optical fiber couplers are available at present? |
| A. | Two |
| B. | One |
| C. | Four |
| D. | Three |
| Answer» E. | |
| 17. |
Optical fiber couplers are also called as ________________ |
| A. | Isolators |
| B. | Circulators |
| C. | Directional couplers |
| D. | Attenuators |
| Answer» D. Attenuators | |
| 18. |
It is a device that distributes light from a main fiber into one or more branch fibers. |
| A. | Optical fiber coupler |
| B. | Optical fiber splice |
| C. | Optical fiber connector |
| D. | Optical isolator |
| Answer» B. Optical fiber splice | |
| 19. |
When considering source-to-fiber coupling efficiencies, the ________ is an important parameter than total output power. |
| A. | Numerical aperture |
| B. | Radiance of an optical source |
| C. | Coupling efficiency |
| D. | Angular power distribution |
| Answer» C. Coupling efficiency | |