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1. (WO2019048028) OPTICAL TRANSMITTER AND TRANSMISSION METHOD
Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

Claims

1. Optical transmitter (100) for transmitting a data signal (101), comprising

an encoder (102) configured to encode the data signal (101) by selecting based on a bit sequence (101, 401) a first symbol and a second symbol from a set (200) of four symbols (201-204) for each one of at least two transmission time slots, and

a modulator (103) configured to use in each transmission time slot the first symbol to modulate a first carrier wave and the second symbol to modulate a second carrier wave, and to transmit the two carrier waves over orthogonal polarizations of an optical carrier ( 104) ,

wherein symbols (201-204) in consecutive transmission time slots have non-identical polarization states.

2. Optical transmitter (100) according to claim 1, wherein

the encoder (102) is configured to select the symbols (201-204) from a Quadrature

Phase Shift Keying, QPSK, base constellation (200).

3. Optical transmitter (100) according to claim 1 or 2, wherein

the modulator (103) is configured to modulate an In-Phase and a Quadrature component of each carrier wave.

4. Optical transmitter (100) according to one of the claims 1 to 3, wherein

symbols (201-204) in at least a subset of consecutive transmission time slots have anti-parallel polarization states.

5. Optical transmitter (100) according to one of the claims 1 to 4, wherein

the encoder (102) is configured to generate the bit sequence (401) based on the data signal (101), and

the data signal (101) comprises less bits than the bit sequence (401).

6. Optical transmitter (100) according to claim 5, wherein

the encoder (102) is configured to perform at least one arithmetic operation based on at least two bits of the data signal (101) to obtain at least one overhead bit (402), and to generate the bit sequence (401) based on the bits of the data signal (101) and at least one overhead bit (402).

7. Optical transmitter (100) according to one of the claims 1 to 6, wherein

the optical transmitter (100) is configured to transmit the data signal (101) with a spectral efficiency of 2.5 bits per transmission time slot.

8. Optical transmitter (100) according to claim 7, wherein

the symbol polarization states in each transmission time slot take one of at least four distinct polarizations states.

9. Optical transmitter (100) according to claim 7 or 8, wherein

the data signal (101) has five bits bl ...b5, and the encoder (102) is configured to generate the bit sequence (401) having eight bits bl ...b5, bl', b2', b3', wherein three overhead bits bl', b2', b3' (402) are generated according to

bl' = b3 XOR b4 XOR b5

b2' = b2 XOR b4 XOR b5

b3' = bl XOR b4 XOR b5

10. Optical transmitter (100) according to claim 9, wherein

for two consecutive transmission time slots Tl and T2, for two orthogonal polarizations X and Y of the optical carrier (104), and for a set (200) of four QPSK symbols (201-204) denoted -1-li, -1+li, 1-li and 1+li, the encoder (102) is configured to select the symbols (201-204) based on the data signal (101) according to the following labelling

Labelling (from left to right) Time slot Ti Time slot T2

5 bits bl ...b5, and

3 overhead bits bl', b2', b3' X polarization Y polarization X polarization Y polarization

0 0 0 0 0 0 1 1 -1-li -1-li -1-li 1+li

0 0 0 0 1 1 0 0 -1-li -1-li 1+li -1-li

0 0 0 1 0 1 0 0 -1-li -1+li -1+li -1-li

0 0 0 1 1 0 1 1 -1-li -1+li 1-li 1+li

0 0 1 0 0 1 1 1 -1-li 1-li -1+li 1+li

00 1 0 1 000 -1-li 1-li 1-li -1-li

00 1 1 0000 -1-li 1+li -1-li -1-li

00 1 1 1 1 1 1 -1-li 1+li 1+li 1+li

0 1 00000 1 -1+li -1-li -1-li -1+li

0 1 00 1 1 1 0 -1+li -1-li 1+li 1-li

0 1 0 1 0 1 1 0 -1+li -1+li -1+li 1-li

0 1 0 1 1 00 1 -1+li -1+li 1-li -1+li

0 1 1 00 1 0 1 -1+li 1-li -1+li -1+li

0 1 1 0 1 0 1 0 -1+li 1-li 1-li 1-li

0 1 1 1 00 1 0 -1+li 1+li -1-li 1-li

0 1 1 1 1 1 0 1 -1+li 1+li 1+li -1+li

1 00000 1 0 1-li -1-li -1-li 1-li

1 000 1 1 0 1 1-li -1-li 1+li -1+li

1 00 1 0 1 0 1 1-li -1+li -1+li -1+li

1 00 1 1 0 1 0 1-li -1+li 1-li 1-li

1 0 1 00 1 1 0 1-li 1-li -1+li 1-li

1 0 1 0 1 00 1 1-li 1-li 1-li -1+li

1 0 1 1 000 1 1-li 1+li -1-li -1+li

1 0 1 1 1 1 1 0 1-li 1+li 1+li 1-li

1 1 000000 1+li -1-li -1-li -1-li

1 1 00 1 1 1 1 1+li -1-li 1+li 1+li

1 1 0 1 0 1 1 1 1+li -1+li -1+li 1+li

1 1 0 1 1 000 1+li -1+li 1-li -1-li

1 1 1 00 1 00 1+li 1-li -1+li -1-li

1 1 1 0 1 0 1 1 1+li 1-li 1-li 1+li

1 1 1 1 00 1 1 1+li 1+li -1-li 1+li

1 1 1 1 1 1 00 1+li 1+li 1+li -1-li

11. Optical transmitter (100) according to one of the claims 1 to 6, wherein

the optical transmitter (100) is configured to transmit the data signal (101) with a spectral efficiency of 3.5 bits per transmission time slot.

12. Optical transmitter (100) according to claim 11, wherein

symbols (201-204) in at least a subset of consecutive transmission time slots have orthogonal polarization states.

13. Optical transmitter (100) according to claim 11 or 12, wherein

the data signal (101) has seven bits bl ...b7, and the encoder (102) is configured to generate the bit sequence (401) having eight bits bl ...b7, b', wherein the overhead bit b' (402) is generated according to

b' = bl XOR b4 XOR b6 XOR (blANDb3) XOR (blANDb4) XOR (blANDb5)XOR (blANDb6) XOR (b2ANDb3) XOR (b2ANDb4) XOR (b2ANDb5) XOR (b2ANDb6) XOR (b3ANDb5) XOR (b3ANDb6) XOR (b4ANDb5) XOR (b4ANDb6)

14. Optical transmitter (100) according to claim 13, wherein

for two consecutive transmission time slots Tl and T2, for two orthogonal polarizations X and Y of the optical carrier (104), and for a set (200) of four QPSK symbols (201-204) denoted -1-li, -1+li, 1-li and 1+li, the encoder (102) is configured to select the symbols (201-204) based on the data signal (101) according to the following labelling

Labelling (from left to right) Time slot Ti Time slot T2

7 bits bl ...b7, and

1 overhead bit b' X polarization Y polarization X polarization Y polarization

0 0 0 0 0 0 0 1 -1-li -1-li -1-li -1+li

0 0 0 0 0 0 1 1 -1-li -1-li -1-li 1+li

0 0 0 0 0 1 0 0 -1-li -1-li -1+li -1-li

0 0 0 0 0 1 1 0 -1-li -1-li -1+li 1-li

0 0 0 0 1 0 0 1 -1-li -1-li 1-li -1+li

0 0 0 0 1 0 1 1 -1-li -1-li 1-li 1+li

0 0 0 0 1 1 0 0 -1-li -1-li 1+li -1-li

0 0 0 0 1 1 1 0 -1-li -1-li 1+li 1-li

0 0 0 1 0 0 0 0 -1-li -1+li -1-li -1-li

0 0 0 1 0 0 1 0 -1-li -1+li -1-li 1-li

0 0 0 1 0 1 0 0 -1-li -1+li -1+li -1-li

0 0 0 1 0 1 1 0 -1-li -1+li -1+li 1-li

0 0 0 1 1 0 0 1 -1-li -1+li 1-li -1+li

0 0 0 1 1 0 1 1 -1-li -1+li 1-li 1+li

0 0 0 1 1 1 0 1 -1-li -1+li 1+li -1+li

0 0 0 1 1 1 1 1 -1-li -1+li 1+li 1+li

0 0 1 0 0 0 0 1 -1-li 1-li -1-li -1+li

0 0 1 0 0 0 1 1 -1-li 1-li -1-li 1+li

0 0 1 0 0 1 0 1 -1-li 1-li -1+li -1+li

00 1 00 1 1 1 -1-li 1-li -1+li 1+li

00 1 0 1 000 -1-li 1-li 1-li -1-li

00 1 0 1 0 1 0 -1-li 1-li 1-li 1-li

00 1 0 1 1 00 -1-li 1-li 1+li -1-li

00 1 0 1 1 1 0 -1-li 1-li 1+li 1-li

00 1 1 0000 -1-li 1+li -1-li -1-li

00 1 1 00 1 0 -1-li 1+li -1-li 1-li

00 1 1 0 1 0 1 -1-li 1+li -1+li -1+li

00 1 1 0 1 1 1 -1-li 1+li -1+li 1+li

00 1 1 1 000 -1-li 1+li 1-li -1-li

00 1 1 1 0 1 0 -1-li 1+li 1-li 1-li

00 1 1 1 1 0 1 -1-li 1+li 1+li -1+li

00 1 1 1 1 1 1 -1-li 1+li 1+li 1+li

0 1 00000 1 -1+li -1-li -1-li -1+li

0 1 0000 1 1 -1+li -1-li -1-li 1+li

0 1 000 1 0 1 -1+li -1-li -1+li -1+li

0 1 000 1 1 1 -1+li -1-li -1+li 1+li

0 1 00 1 000 -1+li -1-li 1-li -1-li

0 1 00 1 0 1 0 -1+li -1-li 1-li 1-li

0 1 00 1 1 00 -1+li -1-li 1+li -1-li

0 1 00 1 1 1 0 -1+li -1-li 1+li 1-li

0 1 0 1 000 1 -1+li -1+li -1-li -1+li

0 1 0 1 00 1 1 -1+li -1+li -1-li 1+li

0 1 0 1 0 1 00 -1+li -1+li -1+li -1-li

0 1 0 1 0 1 1 0 -1+li -1+li -1+li 1-li

0 1 0 1 1 00 1 -1+li -1+li 1-li -1+li

0 1 0 1 1 0 1 1 -1+li -1+li 1-li 1+li

0 1 0 1 1 1 00 -1+li -1+li 1+li -1-li

0 1 0 1 1 1 1 0 -1+li -1+li 1+li 1-li

0 1 1 00000 -1+li 1-li -1-li -1-li

0 1 1 000 1 0 -1+li 1-li -1-li 1-li

0 1 1 00 1 0 1 -1+li 1-li -1+li -1+li

0 1 1 00 1 1 1 -1+li 1-li -1+li 1+li

0 1 1 0 1 000 -1+li 1-li 1-li -1-li

0 1 1 0 1 0 1 0 -1+li 1-li 1-li 1-li

0 1 1 0 1 1 0 1 -1+li 1-li 1+li -1+li

0 1 1 0 1 1 1 1 -1+li 1-li 1+li 1+li

0 1 1 1 0000 -1+li 1+li -1-li -1-li

0 1 1 1 00 1 0 -1+li 1+li -1-li 1-li 0 1 1 1 0 1 00 -1+li 1+li -1+li -1-li

0 1 1 1 0 1 1 0 -1+li 1+li -1+li 1-li

0 1 1 1 1 00 1 -1+li 1+li 1-li -1+li

0 1 1 1 1 0 1 1 -1+li 1+li 1-li 1+li

0 1 1 1 1 1 0 1 -1+li 1+li 1+li -1+li

0 1 1 1 1 1 1 1 -1+li 1+li 1+li 1+li

1 0000000 1-li -1-li -1-li -1-li

1 00000 1 0 1-li -1-li -1-li 1-li

1 0000 1 00 1-li -1-li -1+li -1-li

1 0000 1 1 0 1-li -1-li -1+li 1-li

1 000 1 00 1 1-li -1-li 1-li -1+li

1 000 1 0 1 1 1-li -1-li 1-li 1+li

1 000 1 1 0 1 1-li -1-li 1+li -1+li

1 000 1 1 1 1 1-li -1-li 1+li 1+li

1 00 1 0000 1-li -1+li -1-li -1-li

1 00 1 00 1 0 1-li -1+li -1-li 1-li

1 00 1 0 1 0 1 1-li -1+li -1+li -1+li

1 00 1 0 1 1 1 1-li -1+li -1+li 1+li

1 00 1 1 000 1-li -1+li 1-li -1-li

1 00 1 1 0 1 0 1-li -1+li 1-li 1-li

1 00 1 1 1 0 1 1-li -1+li 1+li -1+li

1 00 1 1 1 1 1 1-li -1+li 1+li 1+li

1 0 1 0000 1 1-li 1-li -1-li -1+li

1 0 1 000 1 1 1-li 1-li -1-li 1+li

1 0 1 00 1 00 1-li 1-li -1+li -1-li

1 0 1 00 1 1 0 1-li 1-li -1+li 1-li

1 0 1 0 1 00 1 1-li 1-li 1-li -1+li

1 0 1 0 1 0 1 1 1-li 1-li 1-li 1+li

1 0 1 0 1 1 00 1-li 1-li 1+li -1-li

1 0 1 0 1 1 1 0 1-li 1-li 1+li 1-li

1 0 1 1 000 1 1-li 1+li -1-li -1+li

1 0 1 1 00 1 1 1-li 1+li -1-li 1+li

1 0 1 1 0 1 0 1 1-li 1+li -1+li -1+li

1 0 1 1 0 1 1 1 1-li 1+li -1+li 1+li

1 0 1 1 1 000 1-li 1+li 1-li -1-li

1 0 1 1 1 0 1 0 1-li 1+li 1-li 1-li

1 0 1 1 1 1 00 1-li 1+li 1+li -1-li

1 0 1 1 1 1 1 0 1-li 1+li 1+li 1-li

1 1 000000 1+li -1-li -1-li -1-li 1 1 0000 1 0 1+li -1-li -1-li 1-li

1 1 000 1 0 1 1+li -1-li -1+li -1+li

1 1 000 1 1 1 1+li -1-li -1+li 1+li

1 1 00 1 000 1+li -1-li 1-li -1-li

1 1 00 1 0 1 0 1+li -1-li 1-li 1-li

1 1 00 1 1 0 1 1+li -1-li 1+li -1+li

1 1 00 1 1 1 1 1+li -1-li 1+li 1+li

1 1 0 1 000 1 1+li -1+li -1-li -1+li

1 1 0 1 00 1 1 1+li -1+li -1-li 1+li

1 1 0 1 0 1 0 1 1+li -1+li -1+li -1+li

1 1 0 1 0 1 1 1 1+li -1+li -1+li 1+li

1 1 0 1 1 000 1+li -1+li 1-li -1-li

1 1 0 1 1 0 1 0 1+li -1+li 1-li 1-li

1 1 0 1 1 1 00 1+li -1+li 1+li -1-li

1 1 0 1 1 1 1 0 1+li -1+li 1+li 1-li

1 1 1 00000 1+li 1-li -1-li -1-li

1 1 1 000 1 0 1+li 1-li -1-li 1-li

1 1 1 00 1 00 1+li 1-li -1+li -1-li

1 1 1 00 1 1 0 1+li 1-li -1+li 1-li

1 1 1 0 1 00 1 1+li 1-li 1-li -1+li

1 1 1 0 1 0 1 1 1+li 1-li 1-li 1+li

1 1 1 0 1 1 0 1 1+li 1-li 1+li -1+li

1 1 1 0 1 1 1 1 1+li 1-li 1+li 1+li

1 1 1 1 000 1 1+li 1+li -1-li -1+li

1 1 1 1 00 1 1 1+li 1+li -1-li 1+li

1 1 1 1 0 1 00 1+li 1+li -1+li -1-li

1 1 1 1 0 1 1 0 1+li 1+li -1+li 1-li

1 1 1 1 1 00 1 1+li 1+li 1-li -1+li

1 1 1 1 1 0 1 1 1+li 1+li 1-li 1+li

1 1 1 1 1 1 00 1+li 1+li 1+li -1-li

1 1 1 1 1 1 1 0 1+li 1+li 1+li 1-li

15. Optical transmission system, comprising

the optical transmitter (100) according to one of the claims 1 to 14, and

an optical receiver (300) for receiving the data signal (101), wherein the optical receiver (300) is configured to receive and decode the modulated carrier waves of the optical carrier (104) to obtain the data signal (101).

16. Method (500) of optically transmitting a data signal (101), comprising

encoding (501) the data signal (101) by selecting based on a bit sequence a first symbol and a second symbol from a set (200) of four symbols (201-204) for each one of at least two transmission time slots, and

using in each transmission time slot the first symbol to modulate a first carrier wave and the second symbol to modulate a second carrier wave, and transmitting the two carrier waves over orthogonal polarizations of an optical carrier (104),

wherein symbols (201-204) in consecutive transmission time slots have non-identical polarization states.