Transceiver module and integrated circuit with dual eye openers

• US 20070031153A1
• Filed: 04/17/2003
• Published: 02/08/2007
• Est. Priority Date: 06/25/2002
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Lenosky, Tom, Case, Dan, Hofmeister, Rudy, Madden, Christopher, Farley, Mark, Aronson, Lewis
• Granted Patent: US 7,486,894 B2
• Time in Patent Office: Days
• US Class Current: 398/138
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04L 25/242 with retiming
• CPC Class Codes: H04L 7/033 using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop

Abstract

A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down modes.

Claims

1. An optical transceiver module, comprising:

a serial electrical interface with an electrical output port and an electrical input port;

a receive path comprising;

an optical input port for receiving a first optical signal from external to the transceiver module;

a receiver eye opener for retiming and reshaping a first serial electrical data stream based on the first optical signal; and

the electrical output port of the serial electrical interface for transmitting the retimed and reshaped first serial electrical data stream to external to the transceiver module; and

a transmit path comprising;

an electrical input port of the serial electrical interface for receiving;

a second serial electrical data stream from external to the transceiver module;

a transmitter eye opener for retiming and reshaping the second seria electrical data stream; and

an optical output port for transmitting a second optical signal to external to the transceiver module, the second optical signal based on the retimed and reshaped second serial electrical data stream.

2. The transceiver module of claim 1, wherein the receiver eye opener comprises a port coupled to receive a reference clock for use in retiming and reshaping the first serial electrical data stream.

3. The transceiver module of claim 2, wherein the receiver eye opener further comprises a phase locked loop for aligning a phase of the first electrical data stream with the reference clock.

4. The transceiver module of claim 2, wherein the transmitter eye opener comprises a port coupled to receive the reference clock that is received by the receiver eye opener.

5. The transceiver module of claim 1, further comprising:

a receiver communicatively coupled to the receiver eye opener for converting the first optical signal to the first serial electrical data stream, and

a transmitter communicatively coupled to the transmitter eye opener for converting the retimed and reshaped second serial electrical data stream to the second optical signal.

7. The transceiver module of claim 1, wherein the first serial electrical data stream has a data rate of approximately 10 Gb/s or faster.

8. The transceiver module of claim 1, wherein the transceiver module comprises an XFP (10-Gigabit Small Form Factor)—

compliant transceiver module.

9. The transceiver module of claim 1, wherein the retimed and reshaped first serial electrical data stream comprises an XFI (10 Gb/s serial electrical interface)—

compliant electrical data stream.

10. The transceiver module of claim 1, wherein the electrical output port transmits the retimed and reshaped first serial electrical data stream to a host, and the electrical input port receives the second serial electrical data stream from the host.

11. The transceiver module of claim 1, wherein the receiver eye opener comprises a first CDR (Clock and Data Recovery), and the transmitter eye opener comprises a second CDR.

12. The transceiver module of claim 11, wherein each CDR further comprises a retimer to retime the serial electrical data stream in response to a clock signal.

13. The transceiver module of claim 12, wherein the clock signal is switchably selectable between a reference clock received by the eye opener and a clock recovered from the electrical serial data stream.

6. An optical transceiver module, comprising:

a serial electrical interface with an electrical output port and an electrical input port;

a receive path comprising;

an optical input port for receiving a first optical signal from external to the transceiver module;

a receiver eye opener for retiming and reshaping a first serial electrical data stream based on the first optical signal; and

the electrical output port of the serial electrical interface for transmitting the retimed and reshaped first serial electrical data stream to external to the transceiver module; and

a transmit path comprising;

an electrical input port of the serial electrical interface for receiving a second serial electrical data stream from external to the transceiver module;

a transmitter eye opener for retiming and reshaping the second serial electrical data stream; and

an optical output port for transmitting a second optical signal to external to the transceiver module, the second optical signal based on the retimed and reshaped second serial electrical data stream, wherein the electrical output port switchably outputs a signal selected from a group comprising the first serial electrical data stream without retiming and reshaping, the retimed and reshaped first serial electrical data stream, and a diagnostic data stream.

14. In an optical transceiver module having a serial electrical interface with an electrical output port and an electrical input port, a method for receiving and transmitting signals, the method comprising the steps of:

receiving a first optical signal from external to the transceiver module;

converting the first optical signal to a first serial electrical data stream;

retiming and reshaping the first serial electrical data stream;

transmitting the retimed and reshaped first serial electrical data stream to external to the transceiver module;

receiving a second serial electrical data stream from external to the transceiver module;

retiming and reshaping the second serial electrical data stream;

converting the retimed and reshaped second serial electrical data stream to a second optical signal; and

transmitting the second optical signal to external to the transceiver module.

15. The method of claim 14, further comprising:

receiving a reference clock, wherein the reference clock is used to reshape and retime the first serial electrical data stream and also to reshape and retime the second serial electrical data stream.

16. The method of claim 14 further comprising:

switchably transmitting a signal selected from a group comprising the first serial electrical data stream without retiming and reshaping, the retimed and reshaped first serial electrical data stream, and a diagnostic data stream.

17. The method of claim 14, wherein each step of retiming and reshaping a serial electrical data stream comprises:

recovering a clock and data from the serial electrical data stream; and

retiming the recovered data based on a clock signal.

19. The method of claim 14, wherein the first serial electrical data stream has a data rate of approximately 10 Gb/s or faster.

20. The method of claim 14, wherein the retimed and reshaped first serial electrical data stream comprises an XFI (10 Obis serial electrical interface)—

compliant electrical data stream.

18. In an optical transceiving module having a serial electrical interface with an electrical output port and an electrical input port, a method for receiving and transmitting signals, the method comprising the steps of:

receiving a first optical signal from external to the transceiver module;

converting the first optical signal to a first serial electrical data stream;

retiming and reshaping the first serial electrical data stream;

transmitting the retimed and reshaped first serial electrical data stream to external to the transceiver module;

receiving a second serial electrical data stream from external to the transceiver module;

retiming and reshaping the second serial electrical data stream;

converting the retimed and reshaped second serial electrical data stream to a second optical signal;

transmitting the second optical signal to external to the transceiver module;

wherein each step of retiming and reshaping a serial electrical data stream comprises;

recovering a clock and data from the serial electrical data stream; and

retiming the recovered data based on a clock signal; and

wherein the clock signal is switchably selectable between a received reference clock and the recovered clock.