System and method for performing high-speed communications over fiber optical networks

• US 10,771,181 B2
• Filed: 03/09/2019
• Issued: 09/08/2020
• Est. Priority Date: 06/10/2003
• Status: Active Grant

• Current Assignee: Alexander Soto, Walter Soto
• Original Assignee: Alexander Soto, Walter Soto
• Inventors: Soto, Alexander, Soto, Walter
• Primary Examiner(s): Bello, Agustin
• Application Number:
  US16/297,610
• Publication Number:
  US 20190207700A1
• Time in Patent Office: 549 Days
• Field of Search: 385 88- 92, 398135-139
• CPC Class Codes: H04B 10/2507 for the reduction or elimination of distortion or dispersion
• CPC Class Codes: H04B 10/2581 Multimode transmission
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04B 10/5161 Combination of different modulation schemes
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0256 at the optical channel layer
• CPC Class Codes: H04J 14/0267 Optical signaling or routing
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]

Abstract

Processing a received optical signal in an optical communication network includes equalizing a received optical signal to provide an equalized signal, demodulating the equalized signal according to an m-ary modulation format to provide a demodulated signal, decoding the demodulated signal according to an inner code to provide an inner-decoded signal, and decoding the inner-decoded signal according to an outer code. Other aspects include other features such as equalizing an optical channel including storing channel characteristics for the optical channel associated with a client, loading the stored channel characteristics during a waiting period between bursts on the channel, and equalizing a received burst from the client using the loaded channel characteristics.

Claims

1. A pluggable optical transceiver module comprising of:

an electrical system interface for receiving a first electrical data signal and for transmitting a second electrical data signal;

an m-ary modulator for increasing the number of bits per symbol in the first electrical data signal to produce a first m-ary modulation signal;

a digital to analog converter for converting the first m-ary modulation signal to a first electrical m-ary analog modulation signal;

a driver for amplifying the first electrical m-ary analog modulation signal to an amplified first electrical m-ary analog modulation signal to drive an optical transmitter;

the optical transmitter for emitting a first optical signal on a first wavelength responsive to and representative of the amplified first electrical m-ary analog modulation signal from the driver;

an optical detector for receiving a second optical signal on a second wavelength to produce an electrical analog signal;

an amplifier for amplifying the electrical analog signal to an amplified electrical analog signal;

a clock data recovery unit for recovering clock and data information to produce a second m-ary modulation signal from the amplified electrical analog signal;

an equalizer for performing equalization on the second m-ary modulation signal to remove noise; and

an m-ary demodulator for decreasing the number of bits per symbol in the equalized second m-ary modulation signal to produce the second electrical data signal.

2. The pluggable optical transceiver module of claim 1, wherein the form factor of the pluggable optical transceiver module is a pluggable form factor standard.

3. The pluggable optical transceiver module of claim 2, wherein the pluggable form factor standard of the pluggable optical transceiver module is a small form factor pluggable (SFP) or SFP+ form factor standard.

4. The pluggable optical transceiver module of claim 2, wherein the pluggable form factor standard of the pluggable optical transceiver module is an XFP form factor standard.

5. The pluggable optical transceiver module of claim 1, wherein the m-ary modulator and the m-ary demodulator perform m-ary quadrature amplitude modulation and de-modulation, respectively, that uses two or more bits per symbol.

6. The pluggable optical transceiver module of claim 1, wherein the m-ary modulator and the m-ary demodulator perform m-ary quadrature phase shift keying modulation and de-modulation, respectively, that uses two or more bits per symbol.

7. The pluggable optical transceiver module of claim 1, wherein the m-ary modulator and the m-ary demodulator perform orthogonal frequency division multiplexing modulation and de-modulation, respectively, that uses two or more bits per symbol.

8. The pluggable optical transceiver module of claim 1, wherein the electrical system interface includes parallel signals.

9. The pluggable optical transceiver module of claim 1, wherein the electrical system interface includes serial signals.

10. The pluggable optical transceiver module of claim 1, wherein the first electrical data signal and second electrical data signal includes parallel electrical data signals.

11. The pluggable optical transceiver module of claim 1, wherein the electrical system interface includes an attachment unit interface (AUI) based interface.

12. The pluggable optical transceiver module of claim 1, wherein the first optical signal on a first wavelength is configured to emit into a first optical fiber and the second optical signal on a second wavelength is configured to be received from the first optical fiber.

13. The pluggable optical transceiver module of claim 1, wherein the first optical signal on a first wavelength is configured to emit into a first optical fiber and the second optical signal on a second wavelength is configured to be received from a second optical fiber.

14. The pluggable optical transceiver module of claim 1, wherein the noise removed by the equalizer includes intersymbol interference (ISI).

15. The pluggable optical transceiver module of claim 1, wherein the equalizer performs decision directed equalization on the second m-ary modulation signal to remove noise.

16. The pluggable optical transceiver module of claim 1, wherein the equalizer performs blind equalization on the second m-ary modulation signal to remove noise.

17. The pluggable optical transceiver module of claim 1, wherein the digital to analog converter is configured to shape, condition, or emphasize the first electrical m-ary analog modulation signal for improved transmission performance.

18. The pluggable optical transceiver module of claim 1, wherein the electrical system interface includes receiving a third electrical data signal and transmitting a fourth electrical data signal, and the pluggable optical transceiver module further includes:

a second m-ary modulator for increasing the number of bits per symbol in the third electrical data signal to produce a third m-ary modulation signal;

a second digital to analog converter for converting the third m-ary modulation signal to a second electrical m-ary analog modulation signal;

a second driver for amplifying the second electrical m-ary analog modulation signal to an amplified second electrical m-ary analog modulation signal to drive a second optical transmitter;

the second optical transmitter for emitting a third optical signal on a third wavelength responsive to and representative of the amplified second electrical m-ary analog modulation signal from the second driver;

a second optical detector for receiving a fourth optical signal on a fourth wavelength to produce a second electrical analog signal;

a second amplifier for amplifying the second electrical analog signal to an amplified second electrical analog signal;

a second clock data recovery unit for recovering clock and data information to produce a fourth m-ary modulation signal from the amplified second electrical analog signal;

a second equalizer for performing equalization on the fourth m-ary modulation signal to remove noise; and

a second m-ary demodulator for decreasing the number of bits per symbol in the equalized fourth m-ary modulation signal to produce the fourth electrical data signal.

19. The pluggable optical transceiver module of claim 18, wherein the third optical signal on a third wavelength is configured to emit into a first optical fiber and the fourth optical signal on a fourth wavelength is configured to be received from the first optical fiber.

20. The pluggable optical transceiver module of claim 18, wherein the third optical signal on a third wavelength is configured to emit into a first optical fiber and the fourth optical signal on a fourth wavelength is configured to be received from a second optical fiber.

21. The pluggable optical transceiver module of claim 18, wherein the third electrical data signal and fourth electrical data signal includes parallel electrical data signals.

22. A pluggable optical transceiver module comprising of:

an electrical system interface for receiving a first electrical data signal and for transmitting a second electrical data signal;

an m-ary modulator for increasing the number of bits per symbol in the first electrical data signal to produce a first m-ary modulation signal;

a digital to analog converter for converting the first m-ary modulation signal to a first electrical m-ary analog modulation signal;

a driver for amplifying the first electrical m-ary analog modulation signal to an amplified first electrical m-ary analog modulation signal to drive an optical transmitter;

the optical transmitter for emitting a first optical signal on a first wavelength responsive to and representative of the amplified first electrical m-ary analog modulation signal from the driver;

an optical detector for receiving a second optical signal on a second wavelength to produce an electrical analog signal;

an amplifier for amplifying the electrical analog signal to an amplified electrical analog signal;

a clock data recovery unit for recovering clock and data information to produce a second m-ary modulation signal from the amplified electrical analog signal;

an equalizer for performing equalization on the second m-ary modulation signal to remove noise;

an m-ary demodulator for decreasing the number of bits per symbol in the equalized second m-ary modulation signal to produce the second electrical data signal; and

wherein the m-ary modulator and the m-ary demodulator perform m-ary pulse amplitude modulation and de-modulation, respectively, that uses two or more bits per symbol.

23. A pluggable optical transceiver module comprising of:

an electrical system interface for receiving a first electrical data signal and for transmitting a second electrical data signal;

an m-ary modulator for increasing the number of bits per symbol in the first electrical data signal to produce a first m-ary modulation signal;

a digital to analog converter for converting the first m-ary modulation signal to a first electrical m-ary analog modulation signal;

a driver for amplifying the first electrical m-ary analog modulation signal to an amplified first electrical m-ary analog modulation signal to drive an optical transmitter;

the optical transmitter for emitting a first optical signal on a first wavelength responsive to and representative of the amplified first electrical m-ary analog modulation signal from the driver;

an optical detector for receiving a second optical signal on a second wavelength to produce an electrical analog signal;

an amplifier for amplifying the electrical analog signal to an amplified electrical analog signal;

a clock data recovery unit for recovering clock and data information to produce a second m-ary modulation signal from the amplified electrical analog signal;

an equalizer for performing equalization on the second m-ary modulation signal to remove noise;

an m-ary demodulator for decreasing the number of bits per symbol in the equalized second m-ary modulation signal to produce the second electrical data signal; and

wherein the equalizer includes coefficients or weights configured to remove noise from the second m-ary modulation signal.