Abstract:
Summary form only given. All-optical clock recovery will be an essential part of future all-optical communication systems. Most of the reported all-optical clock recovery...Show MoreMetadata
Abstract:
Summary form only given. All-optical clock recovery will be an essential part of future all-optical communication systems. Most of the reported all-optical clock recovery schemes to date have been demonstrated based on return to zero (RZ) format data. However, all-optical clock recovery based on non-return to zero (NRZ) format data has been recognized as very difficult to implement because no discretely separated clock component exists in the data. Nevertheless, the NRZ format data is widely used in current lightwave systems because it has a better bandwidth efficiency. In the previous works on the all-optical clock recovery from the NRZ format data, a non-fiber device, such as a semiconductor optical amplifier, has been used. In this paper, we demonstrate, for the first time to our knowledge, an all-optical clock recovery scheme based on fiber devices from the NRZ format data by combining a mode-locked fiber laser with the previously demonstrated fiberoptic-type NRZ-to-pseudo-RZ (PRZ) converter.
Date of Conference: 22-27 February 1998
Date Added to IEEE Xplore: 06 August 2002
Print ISBN:1-55752-521-8
Citations are not available for this document.
Cites in Patents (9)Patent Links Provided by 1790 Analytics
1.
Lakshminarayana, Ganesh; Mu, Ruomei; Wang, Hongsheng; Sarathy, Jithamithra; Stefanov, Boris, "INTEGRATED PERFORMANCE MONITORING PERFORMANCE MAINTENANCE AND FAILURE DETECTION FOR PHOTONIC REGENERATORS"
Inventors:
Lakshminarayana, Ganesh; Mu, Ruomei; Wang, Hongsheng; Sarathy, Jithamithra; Stefanov, Boris
Abstract:
Monitoring of the input power is performed on-chip and is used to monitor and maintain performance, detect failure and trigger network protection strategies. An optical power-monitoring technique uses a photodetector monolithically integrated with the semiconductor optical amplifier--Mach-Zehnder interferometer circuit to monitor the P2R device and keep the output stable while the input power varies.
Assignee:
ALPHION CORP
Filing Date:
27 April 2006
Grant Date:
15 January 2008
Patent Classes:
Current U.S. Class:
359344000
Current International Class:
H01S0030000
2.
Martinez, Julio; Kim, Kwang; Nedzhvetskaya, Olga; Engin, Doruk; Sarathy, Jiten; Antosik, Roman; Dave, Bharat; Evans, Michael; Lidsky, David; Simprini, Ronald; Stefanov, Boris; Thai, Tan, "FORMAT INSENSITIVE AND BIT RATE INDEPENDENT OPTICAL PREPROCESSOR"
Inventors:
Martinez, Julio; Kim, Kwang; Nedzhvetskaya, Olga; Engin, Doruk; Sarathy, Jiten; Antosik, Roman; Dave, Bharat; Evans, Michael; Lidsky, David; Simprini, Ronald; Stefanov, Boris; Thai, Tan
Abstract:
A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. The method involves subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.
Assignee:
ALPHION CORP
Filing Date:
15 July 2002
Grant Date:
27 April 2004
Patent Classes:
Current U.S. Class:
356477000
Current International Class:
G01B0090200000
3.
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu, "BIT RATE AND FORMAT INSENSITIVE ALL OPTION CLOCK EXTRACTION CIRCUIT"
Inventors:
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.
Assignee:
ALPHION CORP
Filing Date:
15 July 2002
Grant Date:
13 January 2004
Patent Classes:
Current U.S. Class:
359326000
Current International Class:
G02F0013500000
4.
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Roanld; Stefanov, Boris; Thai, Tan Buu, "BIT RATE AND FORMAT INSENSITIVE ALL OPTICAL CLOCK EXTRACTION CIRCUIT"
Inventors:
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Roanld; Stefanov, Boris; Thai, Tan Buu
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.
Assignee:
ALPHION CORP
Filing Date:
15 July 2002
Grant Date:
30 December 2003
Patent Classes:
Current U.S. Class:
398185000
Current International Class:
H04B0100400000
5.
Sarathy, Jithamithra; Dave, Bharat; Stefanov, Boris; Simprini, Ronald; Thai, Tan B.; Antosik, Roman; Miglo, Aleksandr; Nedzhvetska, Olga; Kim, Kwang; Engin, Doruk, "BIT RATE AND FORMAT INSENSITIVE ALL OPTICAL CIRCUIT FOR RESHAPING REGENERATION AND RETIMING OF OPTICAL PULSE STREAMS"
Inventors:
Sarathy, Jithamithra; Dave, Bharat; Stefanov, Boris; Simprini, Ronald; Thai, Tan B.; Antosik, Roman; Miglo, Aleksandr; Nedzhvetska, Olga; Kim, Kwang; Engin, Doruk
Abstract:
A method and system for AO 3 R functionality is presented. The system includes an AO 2 R device followed by an AOCR clock recovery module and an AOR retiming device. The AOR retiming device takes as input a recovered clock signal extracted from the output of the AO 2 R by the AOCR clock recovery module. The output is the recovered clock signal gated by the regenerated and reshaped input signal, and a monitor circuit is used to set the optimum operations of the retiming device. In a first embodiment the output of the AOR retiming device is fed to an AOC code and wavelength conversion output stage, which returns the signal to the NRZ coding, on a service wavelength converted to match the fixed wavelength connection with the DWDM transmission system. In a second embodiment the code conversion is incorporated into the AOR retiming device, and wavelength conversion is accomplished in the AOCR clock recovery device.
Assignee:
ALPHION CORP
Filing Date:
05 October 2001
Grant Date:
21 October 2003
Patent Classes:
Current U.S. Class:
356477000, 359238000
Current International Class:
G01B0090200000, G02B0260000000
6.
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu, "BIT RATE AND FORMAT INSENSITIVE ALL OPTICAL CLOCK EXTRACTION CIRCUIT"
Inventors:
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.
Assignee:
ALPHION CORP
Filing Date:
15 July 2002
Grant Date:
23 September 2003
Patent Classes:
Current U.S. Class:
359326000
Current International Class:
G02F0013500000
7.
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu, "BIT RATE AND FORMAT INSENSITIVE ALL OPTICAL CLOCK EXTRACTION CIRCUIT"
Inventors:
Dave, Bharat; Engin, Doruk; Kim, Kwang; Laham, Mohammad; Martinez, Julio; Nedzhvetskaya, Olga; Sarathy, Jithamithra; Simprini, Ronald; Stefanov, Boris; Thai, Tan Buu
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.
Assignee:
ALPHION CORP
Filing Date:
04 May 2001
Grant Date:
13 May 2003
Patent Classes:
Current U.S. Class:
398176000
Current International Class:
H04B0100200000
8.
DAVE, Bharat; ENGIN, Doruk; KIM, Kwang; LAHAM, Mohammad; MARTINEZ, Julio; NEDZHVETSKAYA, Olga; SARATHY, Jithamithra; SIMPRINI, Ronald; STEFANOV, Boris; THAI, Tan, "BIT-RATE AND FORMAT INSENSITIVE ALL-OPTICAL CLOCK EXTRACTION CIRCUIT"
Inventors:
DAVE, Bharat; ENGIN, Doruk; KIM, Kwang; LAHAM, Mohammad; MARTINEZ, Julio; NEDZHVETSKAYA, Olga; SARATHY, Jithamithra; SIMPRINI, Ronald; STEFANOV, Boris; THAI, Tan
Abstract:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage (150) preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal (100) is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm (105, 106) of an asymmetric interferometric device. The output (103) of the processing stage is fed to a clock recovery stage (160), which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources (113, 114) to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms (111, 112) of an interferometer, with two DFB lasers (113, 114) as terminuses. The output (115) of the interferometer is an optical clock signal at the clock rate of the original input.
Assignee:
ALPHION CORP
Filing Date:
04 October 2001
Grant Date:
18 April 2002
Patent Classes:
Current International Class:
H04B0101700000, H04L0070000000
9.
MARTINEZ, Julio; KIM, Kwang; NEDZHVETSKAYA, Olga; ENGIN, Doruk; SARATHY, Jithamithra; ANTOSIK, Roman; DAVE, Bharat; EVANS, Michael; LIDSKY, David; SIMPRINI, Ronald; STEFANOV, Boris; THAI, Tan, "FORMAT INSENSITIVE AND BIT RATE INDEPENDENT OPTICAL PREPROCESSOR"
Inventors:
MARTINEZ, Julio; KIM, Kwang; NEDZHVETSKAYA, Olga; ENGIN, Doruk; SARATHY, Jithamithra; ANTOSIK, Roman; DAVE, Bharat; EVANS, Michael; LIDSKY, David; SIMPRINI, Ronald; STEFANOV, Boris; THAI, Tan
Abstract:
A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery.
Assignee:
ALPHION CORP
Filing Date:
04 October 2001
Grant Date:
18 April 2002
Patent Classes:
Current International Class:
H04B0101700000, H04L0070000000
