Now read the text again and find out if the following statements are true (T) or false (F)?

The usage of optical fibre is the only way to transmit signals nowadays.	T	F
There are three components in the system of optical communication.	T	F
Optical fibres are made of one material only.	T	F
Usually there are several fibres in a cable.	T	F
Optical cables are usually located underground.	T	F
There are many kinds of optical fibres.	T	F
Optical fibres appeared in Europe.	T	F
Optical fibres appeared over a century ago.	T	F
Optical fibres are used for exchanging information only.	T	F
There are 2 ways of splicing optical fibres.	T	F

Now read the text again and answer the following questions.
1. What is optical communication?
2. What are the components of an optical communication system?
3. What are the functions of these components?
4. What are optical fibres usually made of?
5. What is the difference between MMF and SMF?
6. How long is the history of optical fibres?
7. What are the spheres of usage of optical fibres?
8. What are two usual ways of splicing of optical fibres?

Part III

(… адрес интернет-странички с видеороликами…)

FIBRE CABLE

(00:24)

PRE-LISTENING

14. What is optical fibre used for?

15. What are the spheres of usage of optical fibre?

16. What is optical fibre made from?

4. Study the meaning of the following words:

jacket = an outer cover around something (ex. - a pipe)

buffer = a protector = a thing that protects something more important

cladding = a covering of a hard material, used as protection

core = the most important and central part of something

Which of these words have a similar meaning and generally one purpose?

WHILE-LISTENING

Watch the video and answer the following questions:

5. How many elements does the cable in the track consist of?

6. What are they?

POST-LISTENING

7. Try to remember the elements of the cable and tell about its structure without watching the video.

OPTICAL TRANSMISSION TECHNOLOGY

(01:35)

PRE-LISTENING

1. What is optical fibre?

2. What is optical fibre used for?

3. What are the advantages of optical fibre usage?

4. Do you know the following words? Study the meaning of the words:

“network”, “data”, “to consume”, “fluctuation”.

WHILE-LISTENING

Watch the video and answer the following questions:

00:00 – 00:46

5. Why is it a growing need for the development of optical communication network?

6. What bandwidth is being discussed nowadays as the way to upgrade the existing system?

7. When did the development of the world first 40Gbps-technology begin?

00:47 – 01:05

8. Who and what is the speaker?

01:06 – end

9. How is the optical transmission module characterized?

10. How much electricity does it consume?

11. How many modules of this kind have been produced?

12. Why was a test organized?

POST-LISTENING

13. Complete the summary of the video track. Fill in the gaps with a suitable word.

There is a growing need for the optical (1) __________ network with larger data transmission (2)__________ . Optical networks have to connect each home. Nowadays an optical communication (3) __________ with a transmission capacity of 40 Gbps is being (4)__________ . The development of the world first 40Gbps optical transmission (5) __________ began in 2006. The optical transmission (6) __________ is much more compact than any other transmitter. It consumes only 35 watt of (7) __________ . There have been produced 100 modules of this kind. A special (8) __________ was organized to make sure that the module works reliably under operational (9) __________ changes due to fluctuations and (10) __________ and power supply (11)__________ .

HOW THE OPTICAL FIBRE SYSTEM WORKS

(02:47)

PRE-LISTENING

1. What is optical fibre?

2. What is optical fibre used for?

3. Can you explain what “optical fiber system” is?

4. Can you think of how many elements are involved in this system and what are they?

5. Do you know the following words? Study the meaning of the words:

“a medium”, “to simplify”, “setting”, “to code (information)”,

“to encode/to decode”.

WHILE-LISTENING

Watch the video and answer the following questions:

6. What is the optical fiber called by the speaker?

7. What analogy is used to simplify the idea of an optical fibre transmission?

8. What historical event is mentioned in the track?

9. What does the speaker demonstrate on a diagram?

10. How many elements are shown on the diagram? What are they?

11. What is the purpose of each element?

12. Watch and listen to the following part of the video track and fill in the gaps in the following text with the words you hear:

00:35 – 01:24

So, put yourself in a (1) __________ World War II setting. You are on a (2) __________ . It’s (3) __________ , and it’s (4) __________ , and it’s (5) __________ . And you want to (6) __________ another ship, so you can, perhaps, ask for some (7) __________ , using your telescope. So, you search for a ship, you try to find one … and… There! You find a ship! Immediately you (8) __________the captain that ship is nearby. The (9) __________ sends a (10) __________ to the (11) __________ to (12) __________ to the other ship. The sailor runs up to the deck and transmits the (13) __________ using a handy flashlight into a Morse code. So, the sailor on the other ship (14) __________ the Morse code (15) __________ and (16) __________ it to the captain of the other ship. And they go back and forth. So, you get the point!

13. What does the word “flashlight” mean?

POST-LISTENING

14. Try to make your own summary of the video track and tell about the process of how optical fibre system works.

HOW DOES OPTICAL FIBRE WORK?

(03:33)

PRE-LISTENING

1. Do you know the following words? Study the meaning of the words:

“to spell”, “solid”, “to extend”, “angle”, “to coat/to be coated”.

WHILE-LISTENING

Watch the video and answer the following questions:

2. Why does the speaker mention Britain and America?

3. Why did the speaker draw a triangle on the board?