Transceiver module and integrated circuit with dual eye openers
View Patent ↗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.
1. An optical transceiver module comprising:
a serial electrical interface with an electrical output port and an electrical input port;
a receiver path comprising:
an optical input port adapted to receive a first optical signal from external to the transceiver module;
a receiver eye opener including a first port coupled to receive a first serial electrical data stream based on the first optical signals, the receiver eye opener being adapted to detect a data rate of the first serial electrical data stream and to resume and reshape the first serial electrical data stream based on the detected data rate; and
the electrical output port of the serial electrical interface adapted to transmit the retimed and reshaped first serial electrical data stream to external to the transceiver module; and
a transmit path comprising;
a second serial electrical data stream received via the electrical input port from external to the transceiver module;
a transmitter eye opener including a first port coupled to receive the second serial electrical data stream, the transmitter eye opener being adapted to retime and reshape the second serial electrical data stream; and
a second optical signal transmitted external to the transceiver module via an optical output, the second optical signal based on the retimed and reshaped second serial electrical data stream.
2. The optical transceiver module of claim 1 , further comprising:
a receiver communicatively coupled to the receiver eye opener for converting the first optical signal to the serial electrical data stream; and
a transmitter communicatively coupled to the transmitter eye opener for converting the second serial electrical data stream to the second optical signal.
3. The optical transceiver module of claim 1 ; wherein the first serial electrical data stream has a data rate of approximately 10 Gb/s or faster.
4. The optical transceiver module of claim 1 , wherein the transceiver module comprises an XFP (10-Gigabits Small Form Factor) compliant transceiver module.
5. The optical 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.
6. The optical transceiver module of claim 1 , wherein the electrical output transmits the retime 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.
7. The optical transceiver module of claim 1 , wherein the receiver eye opener comprises a first CDR (Clock and Data Recovery) configured to detect the data rate of the first serial; electrical data stream, and the transmitter eye opener comprises a second CDR.
8. The optical transceiver module of claim 7 , wherein the first CDR comprises an adjustable wideband oscillator and logic circulatory, wherein the adjustable wideband oscillator and the logic circuitry are configured to detect the data rate of the first serial electrical data stream.
9. The optical transceiver module of claim 7 , wherein the first CDR comprises a plurality of narrowband oscillators, a discriminator, and logic circuitry, wherein the plurality of narrowband oscillators the discriminator, and the logic circuitry are configured to detect the data rate of the first serial electrical data stream.
10. The optical transceiver module of claim 1 , wherein the receiver eye opener comprises an equalizer configured to:
receive a clock signal from a first CDR;
receive coefficients from a coefficient module;
remove channel noise from the first serial electrical data stream; and
communicate the first serial; electrical data stream to the first CDR.
11. The optical transceiver module of claim 10 , wherein the equalizer comprises:
a plurality of delay lines configured to delay individual bits of data included in the first serial electrical data stream or a digital output generated according to the clock signal and to introduce the individual bits of data into a plurality of multipliers at different clock cycles;
the plurality of multiples including:
a plurality of feed forward multipliers each configured to generate a product of the individual bit of data included in the first serial electrical data stream with a coefficient received from the coefficient module and to communicate the product to a summer, and
a plurality of decision feedback equalizer (DFE) multipliers each configured to generate a product of the individual bit of data included in the digital output generated according to the clock signal with a coefficient received from the coefficient module and to communicate the product to the summer;
the summer configured to receive and combine the products from the multipliers and combines; and
a slicer configured to receive a summer output, to generate the digital output according to the clock signal, and to communicate the digital output to from the equalizer and to the plurality of DFE multipliers.
12. The optical transceiver module of claim 10 , wherein the coefficient module comprises a bank of correlation modules configured to perform autocorrelation functions on the first serial electrical data stream.
13. 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 adapted to receive a first optical signal from external to the transceiver module;
a receiver eye opener including a first port coupled to receive a first serial electrical data stream based on the first optical signal, being adapted to retime and reshape the first serial electrical data stream; and
the electrical output port of the serial electrical interface adapted to transmit the retimed and reshaped first serial electrical data stream to external to the transceiver module; and
a transmit path comprising:
a second serial electrical data stream received via the electrical input port form external to the transceiver module;
a transmitter eye opener including a first port coupled to receive the second serial electrical data stream, the transmitter eye opener being adapted to detect a data rate of the second serial electrical data stream and to retime and reshape the second serial electrical data stream based on the detected data rate; and
a second optical signal transmitted external to the transceiver module via an optical output port, the second optical signal based on the retimed and reshaped second serial electrical data stream.
14. The Optical transceiver module of claim 13 , wherein the receiver eye opener comprises a first CDR (Clock and Data Recovery), and the transmitter eye opener comprises a second CDR configured to detect the data rate of the second serial electrical data stream.
15. The optical transceiver module of claim 14 , wherein the second CDR comprises an adjustable wideband oscillator and logic circuitry, wherein the adjustable wideband oscillator and the logic circuitry are configured to detect the data rate of the second serial electrical signal.
16. The optical transceiver module of claim 14 , wherein the second CDR comprises a plurality of narrowband oscillators, a discriminator and logic circuitry, wherein the plurality of narrowband oscillators, the discriminator, and logic circuitry are configured to detect the data rate of the second serial electrical signal.
17. The optical transceiver module of claim 13 , wherein the second serial electrical data stream has a data rate of approximately 10 GB/s or faster.
18. The optical transceiver module of claim 13 , wherein the transceiver module comprises an XFP (10-Gigabit Small Form Factor)-compliant transceiver module.
19. A method of ensuring signal integrity of a first optical signal, the method comprising:
receiving the first optical signal from external to the optical transceiver module;
detecting a data rate of a first serial electrical data stream representative of the first optical signal;
retiming and reshaping a first serial electrical data stream based on the detected data rate; and
transmitting the retimed and reshaped first serial electrical data stream to external to be transceiver module.
20. The method of claim 19 , further comprising:
receiving a second serial electrical data stream from external to the transceiver module;
detecting a data rate of the second serial electrical data stream;
retiming and reshaping the second serial electrical data stream based on the detected data rate; and
transmitting a second optical signal to external to the transceiver module, wherein the second optical signal is representative of the retime and reshaped second serial; electrical data stream.