Host-equalized optical inks

• US 10,298,330 B2
• Filed: 03/30/2016
• Issued: 05/21/2019
• Est. Priority Date: 03/30/2016
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Tatum, Jim Alan
• Primary Examiner(s): Payne, David C
• Assistant Examiner(s): Barua, Pranesh K
• Application Number:
  US15/085,752
• Publication Number:
  US 20170288779A1
• Time in Patent Office: 1,147 Days
• Field of Search: 398116, 398135, 398141, 398139, 398189, 398183
• CPC Class Codes: H04B 10/25073 using spectral equalisation, e.g. spectral filtering
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04B 10/503 Laser transmitters
• CPC Class Codes: H04B 10/504 using direct modulation
• CPC Class Codes: H04B 10/6971 using equalisation
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems

Abstract

An embodiment includes a host-equalized optical transceiver. The host-equalized optical transceiver includes a driver analog interface, a linear laser diode driver (LLDD), and an optical transmitter. The driver analog interface is configured to interface with a host integrated circuit (IC) of a host system. The LLDD is directly electrically coupled to a host IC of the host system via the driver analog interface. The LLDD is configured to receive an equalized electrical data signal directly from the host IC via the driver analog interface and to generate a driving signal based on the equalized electrical data signal. The equalized electrical data signal is a linear signal. The optical transmitter is electrically coupled to the LLDD. The optical transmitter is configured to receive the driving signal from the LLDD and to generate an optical signal that is representative of the driving signal.

Claims

1. A host-equalized optical transceiver comprising:

a driver analog interface that is configured to directly interface with a transmitter equalization circuit of a host system that is independent of the host-equalized optical transceiver, the driver analog interface having a length that is between six inches and 9.6 inches to limit signal degradation along the driver analog interface following equalization by the transmitter equalization circuit;

a linear laser diode driver (LLDD) directly electrically coupled to the transmitter equalization circuit via the driver analog interface, the LLDD being configured to receive an equalized electrical data signal directly from the transmitter equalization circuit of the host system via the driver analog interface and to generate a driving signal based on the equalized electrical data signal, wherein the equalized electrical data signal is a linear and analog signal and is equalized by the transmitter equalization circuit of the host system prior to communication to the host-equalized optical transceiver such that the host-equalized optical transceiver performs no additional equalization prior to reception at the LLDD;

an optical transmitter that is electrically coupled to the LLDD, wherein the optical transmitter is configured to receive the driving signal from the LLDD and to generate an optical signal that is representative of the driving signal;

an amplifier analog interface;

an optical receiver that is optically coupled to an optical fiber, wherein the optical receiver is configured to receive optical data signals communicated along the optical fiber and to convert the received optical data signals to electrical data signals representative of the received optical data signals, the electrical data signals including one or more degraded characteristics that develop as the optical data signals propagated along the optical fiber; and

a linear trans-impedance amplifier (LTIA) that is electrically coupled to the optical receiver and directly electrically coupled to a receiver equalization circuit of the host system via the amplifier analog interface, wherein the LTIA is configured to receive the electrical data signals from the optical receiver and communicate amplified electrical signals directly to the receiver equalization circuit via the amplifier analog interface such that the amplified electrical signals include the degraded characteristics when the amplified electrical signals exit the host-equalized optical transceiver, and the amplifier analog interface includes a length that is between six inches and 9.6 inches to limit introduction of further signal degradation between the LTIA and the receiver equalization circuit,

wherein the host-equalized optical transceiver does not include additional, module-based equalization circuits such that power associated with generation of the equalized electrical data signal is consumed at the host system and power associated with equalization of the degraded characteristics is consumed at the host system.

2. The host-equalized optical transceiver of claim 1, further comprising a digital diagnostics module configured to monitor operational conditions of one or more or a combination of the LLDD, the LTIA, the optical receiver, and the optical transmitter.

3. The host-equalized optical transceiver of claim 1, wherein:

the LLDD is further configured to receive a link equalization signal from the host IC, the link equalization signal including data representative of information used in correction and equalization of the optical data signal generated by the optical transmitter and the optical data signal received by the optical receiver; and

the LLDD is further configured to encode a supervisory signal onto the optical data signal that is representative of the link equalization signal.

4. The host-equalized optical transceiver of claim 3, wherein:

the optical transmitter includes a vertical cavity surface emitting laser; and

the optical transmitter is configured to communicate at a data rate of about 25 gigabits per second.

5. A host-equalized wave division multiplex (WDM) optical system comprising:

a multiplexer; and

a plurality of transmitter portions optically coupled to the multiplexer,

wherein;

each of the plurality of transmitter portions includes the host-equalized optical transceiver of claim 1, configured to generate one optical data signal of a plurality of optical data signals;

each of the plurality of optical data signals includes a particular wavelength; and

the multiplexer is configured to multiplex the plurality of optical data signals into a WDM optical signal.

6. A host-equalized parallel optical system comprising a plurality of transmitter portions, wherein each of the plurality of transmitter portions includes the host-equalized optical transceiver of claim 1.

7. A host-equalized optical link configured to be implemented between a first host system and a second host system, the host-equalized optical link comprising:

a first host-equalized optical transceiver including;

a driver analog interface that is configured to interface with a transmitter equalization circuit of the first host system, the driver analog interface having a length that is between six inches and 9.6 inches to limit signal degradation along the driver analog interface following equalization by the transmitter equalization circuit;

a linear laser diode driver (LLDD) directly electrically coupled to the transmitter equalization circuit via the driver analog interface, the LLDD being configured to receive an equalized electrical data signal directly from the transmitter equalization circuit of the first host system the via the driver analog interface and to generate a driving signal based on the equalized electrical data signal, wherein the equalized electrical data signal is a linear and analog signal and is equalized by the transmitter equalization circuit of the first host system prior to communication to the first host-equalized optical transceiver such that the first host-equalized optical transceiver performs no additional equalization prior to reception at the LLDD; and

an optical transmitter that is electrically coupled to the LLDD, the optical transmitter configured to receive the driving signal from the LLDD and to generate an optical data signal that is representative of the driving signal;

an optical fiber; and

a second host-equalized optical transceiver including;

an amplifier analog interface;

an optical receiver communicatively coupled to the optical transmitter of the first host-equalized optical transceiver via the optical fiber, the optical receiver configured to receive optical data signals communicated along the optical fiber and to convert the received optical data signals to electrical data signals representative of the received optical data signals, the electrical data signals including one or more degraded characteristics that develop as the optical data signals propagated along the optical fiber; and

a linear trans-impedance amplifier (LTIA) that is electrically coupled to the optical receiver and directly electrically coupled to a receiver equalization circuit of the second host system via the amplifier analog interface, the LTIA being configured to receive the electrical data signals from the optical receiver and communicate amplified electrical signals directly to the receiver equalization circuit via the amplifier analog interface such that the amplified electrical signals includes the degraded characteristics when the amplified electrical signals exit the second host-equalized optical transceiver, and the amplifier analog interface includes a length that is between six inches and 9.6 inches to limit introduction of further signal degradation between the LTIA and the receiver equalization circuit,

wherein;

the first host-equalized optical transceiver and the second host-equalized optical transceiver do not include additional, module-based equalization circuits such that power associated with generation of the equalized electrical data signal is consumed at the first host system and power associated with equalization of the degraded characteristics is consumed at the second host system; and

the optical signal communicated between the first host-equalized optical transceiver and the second host-equalized optical transceiver is maintained as a linear signal from the driver analog interface to the amplifier analog interface.

8. The host-equalized optical link of claim 7, wherein the first host-equalized optical transceiver includes a digital diagnostics module configured to monitor operational conditions of one or more or a combination of the LLDD and the optical transmitter.

9. The host-equalized optical link of claim 7, wherein:

the LLDD is further configured to receive a link equalization signal from the first host IC, the link equalization signal including data representative of information used in correction and equalization of the optical data signal generated by the optical transmitter and the optical data signal received by the optical receiver; and

the LLDD is further configured encode a supervisory signal onto the optical data signal that is representative of the link equalization signal.

10. The host-equalized optical link of claim 7, wherein the second host-equalized optical transceiver includes:

a second driver analog interface that is configured to interface with the second host IC of the second host system;

a second LLDD directly electrically coupled to the second via the second driver analog interface, the second LLDD configured to receive an equalized electrical data signal directly from the second via the second driver analog interface and to generate a driving signal based on the equalized electrical data signal, the equalized electrical data signal being a linear signal; and

a second optical transmitter that is electrically coupled to the second LLDD, the second optical transmitter configured to receive the driving signal from the LLDD to generate an optical data signal that is representative of the driving signal.

11. The host-equalized optical link of claim 10, wherein the first host-equalized optical transceiver includes:

a second amplifier analog interface;

a second optical receiver coupled to the second optical transmitter of the second host-equalized optical transceiver via the optical fiber, the optical receiver configured to receive optical data signals communicated along the optical fiber and to convert the received optical data signals to electrical data signals representative of the received optical signals, the electrical data signals including one or more degraded characteristics; and

a second LTIA that is electrically coupled to the second optical receiver and directly electrically coupled to the first host IC of the first host system via the second amplifier analog interface, the LTIA being configured to receive the electrical data signals from the optical receiver and communicate amplified electrical signals directly to the via the amplifier analog interface, the amplified electrical signals including the degraded characteristics.

12. An active optical cable comprising the host-equalized optical link of claim 7.

13. An optical system comprising:

a first host system that includes a first host integrated circuit (ICI;

a second host system that includes a second host IC;

a host-equalized optical link comprising;

a first host-equalized optical transceiver including;

a driver analog interface that is configured to interface with a transmitter equalization circuit of the first host system, the driver analog interface having a length that is between six inches and 9.6 inches to limit signal degradation along the driver analog interface following equalization by the transmitter equalization circuit;

a linear laser diode driver (LLDD) directly electrically coupled to transmitter equalization circuit the via the driver analog interface, the LLDD being configured to receive an equalized electrical data signal directly from the transmitter equalization circuit of the first host system the via the driver analog interface and to generate a driving signal based on the equalized electrical data signal, wherein the equalized electrical data signal is a linear and analog signal and is equalized by the transmitter equalization circuit of the first host system prior to communication to the first host-equalized optical transceiver such that the first host-equalized optical transceiver performs no additional equalization prior to reception at the LLDD; and

an optical transmitter that is electrically coupled to the LLDD, the optical transmitter configured to receive the driving signal from the LLDD and to generate an optical data signal that is representative of the driving signal;

an optical fiber;

a second host-equalized optical transceiver including;

an amplifier analog interface;

an optical receiver communicatively coupled to the optical transmitter of the first host-equalized optical transceiver via the optical fiber, the optical receiver configured to receive optical data signals communicated along the optical fiber and to convert the received optical data signals to electrical data signals representative of the received optical data signals, the electrical data signals including one or more degraded characteristics that develop as the optical data signals propagated along the optical fiber; and

a linear trans-impedance amplifier (LTIA) that is electrically coupled to the optical receiver and directly electrically coupled to a receiver equalization circuit of the second host system via the amplifier analog interface, the LTIA being configured to receive the electrical data signals from the optical receiver and communicate amplified electrical signals directly to the receiver equalization circuit via the amplifier analog interface such that the amplified electrical signals includes the degraded characteristic when the amplified electrical signals exit the second host-equalized optical transceiver, and the amplifier analog interface includes a length that is between six inches and 9.6 inches to limit introduction of further signal degradation between the LTIA and the receiver equalization circuit,

wherein;

the optical signal communicated between the first host-equalized optical transceiver and the second host-equalized optical transceiver is maintained as a linear signal from the driver analog interface to the amplifier analog interface; and

the first host-equalized optical transceiver and the second host-equalized optical transceiver do not include additional, module-based equalization circuits such that power associated with generation of the equalized electrical data signal is consumed at the first host IC and power associated with equalization of the degraded characteristics is consumed at the second host IC.

14. The optical system of claim 13, wherein the first host IC is configured to communicate a link equalization signal with the second via the host-equalized optical link.