EP1589623A3

Raman amplifier

Abstract

A Raman amplifier can easily reduce the gain variation in Raman amplification even when the power of an input signal varies. The Raman amplifier is provided with (a) an optical fiber (130) that Amplifies an input lightwave to produce an output lightwave, (b) a pump-lightwave-supplying means (150a,150b,112,114,115) that supplies pump lightwaves having a plurality of wavelengths to the optical fiber (130), and (c) a control unit (160) that controls only the power of the pump lightwave having the shortest wavelength among the pump lightwaves so that the average value of the gain of the Raman amplification by the optical fiber in an intended wavelength range can be maintained constant.

EP1589623A3, drawing sheet 1 — Sheet 1 of 1

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Term ended

Projected expiry passed 21 April 2025, 1.4 years ago.

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Sheet 1

Every citation, both waysCites: the store holds 4 of 5

Citations
Document	Relation	Office	Category	Cited during	Relevant claims
EP1122842A2	Cites	European Patent Office (EPO)	A	Search report	1
US2004052453A1	Cites	United States of America	X	Search report	1
GB2383209A	Cites	United Kingdom	A	Search report	1,2,7
US6366395B1	Cites	United States of America	A	Search report	1
NAKAJI H: "Lossless dispersion compensating fibre module for wavelength-management networks", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 40, no. 12, 10 June 2004 (2004-06-10), pages 756 - 758, XP006022149, ISSN: 0013-5194	Non-patent	–	–	Search report	–

12 members in 6 offices

This recordMember, by publication datePriority claim

Priority claims5

Priority claims
Document	Office	Kind	Date
2004128889	Japan	A	2004-04-23
2004128889	Japan	A	2004-04-23
2004128889	Japan	–	2004-04-23
2004128889	–	–	–
JP20040128889	–	–	–

Members12

Family members, oldest first
Document	Office	Kind
CA2504022A1	Canada	A1	2005-10-23
EP1589623A2	European Patent Office (EPO)	A2	2005-10-26
US2005237601A1	United States of America	A1	2005-10-27
CN1691553A	China	A	2005-11-02
JP2005309250A	Japan	A	2005-11-04
US6987608B2	United States of America	B2	2006-01-17
EP1589623A3This record	European Patent Office (EPO)	A3	2006-06-14
EP1589623B1	European Patent Office (EPO)	B1	2008-05-07
DE602005006464D1	Germany	D1	2008-06-19
JP4415746B2	Japan	B2	2010-02-17
CN1691553B	China	B	2010-08-11
CA2504022C	Canada	C	2013-07-16

38 legal events, as 4 offices reported them to INPADOC

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	Event	Code	Office
2021-10-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-04-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-03-31	Gb: european patent ceased through non-payment of renewal feeCeasedGBPC	GBPC	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-11-03	Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal feeWithdrawnR119	R119	DE
2019-10-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2019-07-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2019-07-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2019-04-30	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2018-03-15	Fee paymentPLFP	PLFP	FR
2017-03-13	Fee paymentPLFP	PLFP	FR
2016-03-09	Fee paymentPLFP	PLFP	FR
2009-04-15	No opposition filedOpposition26N	26N	EP
2009-03-13	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
2009-03-13	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
2008-06-19	Corresponds to:REF	REF	EP
2008-05-07	Designated contracting statesAK	AK	EP
2008-05-07	European patent grantedGrantedFG4D	FG4D	GB
2008-04-04	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
2008-03-01	Grant fee paidORIGINAL CODE: EPIDOSNIGR3GRAS	GRAS	EP
2007-12-19	Information on inventor provided before grant (corrected)RIN1	RIN1	EP
2007-11-14	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOSNIGR1GRAP	GRAP	EP
2007-02-21	Designation fees paidAKX	AKX	EP
2006-12-06	First examination report despatched17Q	17Q	EP
2006-10-25	Request for examination filed17P	17P	EP
2006-06-14	Designated contracting statesAK	AK	EP
2006-06-14	Request for extension of the european patentAX	AX	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-06-14	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2006-05-12	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
2005-10-26	Designated contracting statesAK	AK	EP
2005-10-26	Request for extension of the european patentAX	AX	EP
2005-09-09	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Raman amplifier

Abstract

Term

Priority claims5

Members12

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