Match List I with List II:

List I

(Optical Amplifiers)

List II

(Operating band)

(A) PDFA (I) S-band
(B) TDFA (II) C-band
(C) EDFA (III) L-band
(D) Gain shifted EDFA (IV) O-band


Choose the correct answer from the options given below:

This question was previously asked in
UGC NET Paper 2: Electronic Science 29 Oct 2022 Shift 1
View all UGC NET Papers >
  1. (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
  2. (A) - (IV), (B) - (II), (C) - (I), (D) - (III)
  3. (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
  4. (A) - (II), (B) - (I), (C) - (IV), (D) - (III)

Answer (Detailed Solution Below)

Option 3 : (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
Free
UGC NET Paper 1: Held on 21st August 2024 Shift 1
8.7 K Users
50 Questions 100 Marks 60 Mins

Detailed Solution

Download Solution PDF

Concept:

Optical Fiber Communication is conducted in low-loss wavelength regions which range from 1260 nm to 1625 nm divided into five wavelength bands:

  1. O-band
  2. E-band
  3. S-band
  4. C-band
  5. L-band

qImage4116

The operating bands of the various optical fiber amplifiers are tabulated below:

Optical Amplifier Operating Band
Erbium-Doped Fiber Amplifier (EDFA) C-Band
Praseodymium-Doped Fiber Amplifier (PDFA) O-Band
Thulium-Doped Fiber Amplifier (TDFA) S-Band
Gain-shifted EDFA L-Band

 

The correct answer is (A) - (IV), (B) - (I), (C) - (II), (D) - (III)

Additional Information

  • O-Band (1260 nm - 1360 nm) is the first wavelength band used for optical communication.
  • C-Band (1530 nm - 1565 nm) has the lowest loss and is most commonly used in optical transmission systems.
  • L-Band (1565 nm - 1625 nm) has the lowest loss after the C-Band.
  • S-Band (1460 nm - 1530 nm) has lower losses than O-Band
  • E-Band (1360 nm - 1460 nm) has the highest loss/attenuation due to residual water (OH group) impurity in the glass.
  • In addition, there are two more wavelength bands: 850-nm-band and U-band (ultra-long-wavelength band: 1625-1675 nm). The 850-nm-band is used for multimode fiber optical communication systems. The U-band is mainly used for network monitoring purposes.
Latest UGC NET Updates

Last updated on Jun 6, 2025

-> The UGC NET Exam Schedule 2025 for June has been released on its official website.

-> The UGC NET Application Correction Window 2025 is available from 14th May to 15th May 2025.

-> The UGC NET 2025 online application form submission closed on 12th May 2025.

-> The June 2025 Exam will be conducted from 21st June to 30th June 2025

-> The UGC-NET exam takes place for 85 subjects, to determine the eligibility for 'Junior Research Fellowship’ and ‘Assistant Professor’ posts, as well as for PhD. admissions.

-> The exam is conducted bi-annually - in June and December cycles.

-> The exam comprises two papers - Paper I and Paper II. Paper I consists of 50 questions and Paper II consists of 100 questions. 

-> The candidates who are preparing for the exam can check the UGC NET Previous Year Papers and UGC NET Test Series to boost their preparations.

Get Free Access Now
Hot Links: teen patti lotus teen patti teen patti master online